Multicarbazole-Based D-π-A Dyes Sensitized Hydrogen Evolution under Visible Light Irradiation
作者:
Lai, Hua;Liu, Xing* ;Zeng, Fanyan;Peng, Gang;Li, Junhua;...
期刊:
ACS Omega ,2020年5(4):2027-2033 ISSN:2470-1343
通讯作者:
Liu, Xing
作者机构:
[Liu, Xing; Lai, Hua; Zeng, Fanyan; Peng, Gang; Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Coll Chem Mat, Hengyang 421008, Peoples R China.;[Liu, Xing; Lai, Hua; Peng, Gang; Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Liu, Xing; Lai, Hua; Peng, Gang; Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
通讯机构:
[Liu, Xing] H;Hengyang Normal Univ, Coll Chem Mat, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Hengyang Normal Univ, Coll Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
摘要:
Donor-πbridge-acceptor (D-π-A) organic dyes, well studied in dye-sensitized solar cells (DSSCs), are found to possess great potential in light-inducing hydrogen evolution due to their distinguished light-harvesting ability and suitable electron energy level. In this work, multicarbazole-based organic dyes (2C, 3C, 4C) were used as photosensitizers of Pt/TiO2 for photocatalytic hydrogen evolution (PHE) from water under visible light irradiation. 3C-Pt/TiO2 shows the best photocatalytic activity among the three dye-sensitized photocatalysts, with a hydrogen evolution rate of 24.7 μmol h-1 and a turnover number of 247 h-1. The activity of 3C-Pt/TiO2 declines significantly after 3 h irradiation. The deactivation was caused by the partial degradation of the electron acceptor, cyanoacrylate moiety, during the photocatalytic process, which was evidenced by UV-vis, Fourier transform infrared spectra (FT-IR), NMR, and mass spectra. This work is expected to contribute toward the understanding of stability issues of organic dyes and the development of more efficient and steady dyes for hydrogen evolution from water splitting. © 2020 American Chemical Society.
语种:
英文
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Facile syntheses of bimetallic Prussian blue analogues (KxM[Fe(CN)6]·nH2O, M=Ni, Co, and Mn) for electrochemical determination of toxic 2-nitrophenol
作者:
Li, Junhua;He, Lingzhi;Jiang, Jianbo;Xu, Zhifeng;Liu, Mengqin;...
期刊:
Electrochimica Acta ,2020年353:136579- ISSN:0013-4686
通讯作者:
Qian, Dong
作者机构:
[Liu, Xing; Liu, Mengqin; Xu, Zhifeng; Li, Junhua; He, Lingzhi] Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Organometall Mat, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Li, Junhua; Qian, Dong] Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Peoples R China.;[He, Lingzhi] Hunan Polytech Environm & Biol, Sch Med, Hengyang 421008, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Peoples R China.
通讯机构:
[Qian, Dong] C;Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Peoples R China.
关键词:
Prussian blue analogues;Synthesis;Electrochemical determination;2-Nitrophenol
摘要:
In this work, three kinds of bimetallic Prussian blue analogues (PBAs), i.e. KxNi [Fe(CN)(6)]center dot nH(2)O (NiFe-PBA), KxCo [Fe(CN)(6)]center dot nH(2)O (CoFe-PBA), and KxMn [Fe(CN)(6)]center dot nH(2)O (MnFe-PBA), were synthesized by a simple precipitation method under identical conditions. Their chemical compositions, structures, morphologies, valences of transition metals, and electrochemical sensing performances for 2-nitrophenol (2-NP) are examined in details. It is found that all the prepared PBAs hold face-centered-cubic structures with near perfect cube morphologies for NiFe-PBA and CoFe-PBA and truncated cube morphology for MnFe-PBA. For the electrochemical detection of 2-NP, a wide detection range of 1.0-700.0 mu M was obtained at all PBAs modified electrodes together with the sensitivities of 443.3, 368.0, and 339.0 mu A cm(-2) mM(-1) and detection limits of 0.28, 0.46, and 0.59 mu M achieved at NiFe-PBA, CoFe-PBA, and MnFe-PBA modified electrodes, respectively. The superiority in electrochemical sensing performance of NiFe-PBA to CoFe-PBA and MnFe-PBA may stem from its higher conductivity, lager electroactive surface area, and better intrinsic catalytic property of the transition metal in its framework. Furthermore, the constructed NiFe-PBA-based sensor displays good repeatability, long-term stability, and high selectivity together with desirable recoveries (97.8-103.9%) for the assay of 2-NP in water samples. The present work is the first report on the PBAs-based electrochemical sensors for 2-NP detection, which may promise a future of PBAs or PBAs-based materials for sensing applications. (c) 2020 Elsevier Ltd. All rights reserved.
语种:
英文
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Highly Sensitive Voltammetric Sensor for Nanomolar Dopamine Detection Based on Facile Electrochemical Reduction of Graphene Oxide and Ceria Nanocomposite
作者:
Deng, Peihong;Feng, Jinxia;Xiao, Jinyun;Liu, Jun* ;Nie, Xue;...
期刊:
Journal of the Electrochemical Society ,2020年167(14):146511 ISSN:0013-4651
通讯作者:
Liu, Jun
作者机构:
[He, Quanguo; Deng, Peihong; Nie, Xue; Li, Junhua] Hengyang Normal Univ, Key Lab Funct Organomet Mat Hunan Prov Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;[He, Quanguo; Xiao, Jinyun; Liu, Jun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构:
[Liu, Jun] H;Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
关键词:
dopamine;ceria;voltammetric sensor;reduced graphene oxide;electrochemical detection
摘要:
In this study, a new electrochemical sensor was fabricated and characterized based on a glassy carbon electrode (GCE) modified with ceria (CeO2) nanoparticles decorated with electrochemical reduced graphene oxide (denoted as Ceria-ErGO/GCE). The results showed that a large number of spherical ceria nanoparticles with a diameter of 20–200 nm are well wrapped by gossamer like ErGO nanosheets. Compared with ceria and ErGO, ceria-ErGO nanocomposites have a synergistic effect on the charge transfer between the electrode and the solution interface. Ultrasensitive and selective determination of dopamine (DA) can be realized at the Ceria-ErGO/GCE. Under the optimum conditions, the calibration curve for the peak current of DA oxidation vs its concentration showed in three fragmented ranges of 6.0 nM–0.1 μM; 0.1 μM–2.0 μM and 2.0 μM–20 μM, respectively. The limit of detection of 3.0 nM (S/N = 3) was obtained under 90 s accumulation. In addition, the advantages of the sensor are easy regeneration of electrode surface, fast and convenient electrode preparation, low cost, sensitive and reliable determination results. This method is particularly suitable for the fast detection of DA in commercial pharmaceuticals and clinical urine as well as serum samples. © 2020 The Electrochemical Society (“ECS”). Published on behalf of ECS by IOP Publishing Limited.
语种:
英文
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一种花球状Mn-Fe普鲁士蓝类似物材料及其制备方法与应用
发明/设计人:
李俊华;文丽瑶;肖敏芝;许志锋;刘梦琴;...
申请/专利权人:
衡阳师范学院
申请/专利号:
201910785695.1
申请时间:
2019.08.23
公开号:
110412313B
公开时间:
2019.11.05
主申请人地址:
湖南省衡阳市雁峰区黄白路165号
摘要:
本发明公开了一种花球状Mn‑Fe普鲁士蓝类似物材料及其制备方法与应用。所述的制备方法包含如下步骤:A液的配制步骤:称取0.1~0.2gK3[Fe(CN)6]溶于10~30mL去离子水中得A液;B液的配制步骤:称取0.05~0.1gMnCl2溶于10~30mL去离子水中得B液;反应步骤:将A液在搅拌条件下滴加至B液中,滴加完毕后将混合液搅拌反应16~32h即得所述的花球状Mn‑Fe普鲁士蓝类似物材料。利用本发明所述的花球状Mn‑Fe普鲁士蓝类似物材料制备得到的修饰电极其对2,4‑二硝基酚的检测具有较高的灵敏度、选择性和以及较低的检出限。
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N-doped carbon coated TiO2 hollow spheres as ultralong-cycle-life Na-ion battery anodes
作者:
Liu, Beibei;Wang, Jin;Li, Junhua;Fan, Kaili;Zhao, Dan;...
期刊:
Journal of Physics and Chemistry of Solids ,2019年134:214-224 ISSN:0022-3697
通讯作者:
Qian, Dong
作者机构:
[Wang, Jin; Fan, Kaili; Liu, Beibei; Zhao, Dan; Qian, Dong; Liu, Guiyu] Cent S Univ, Hunan Prov Key Lab Chem Power Resources, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua; Liu, Beibei] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China.
通讯机构:
[Qian, Dong] C;Cent S Univ, Hunan Prov Key Lab Chem Power Resources, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
关键词:
N-doped carbon coated TiO2 hollow spheres;Synthesis;Cycling stability;Na-ion battery
摘要:
We used a simple solvothermal–pyrolytic two-step route to synthesize N-doped carbon coated anatase TiO2 (TiO2@NC) hollow spheres, where dopamine hydrochloride was simultaneously used as the sources of nitrogen and carbon. The unique hollow structure of the TiO2@NC hollow spheres and the introduced N-doped carbon coating layer resulted in excellent structural stability, facile electrolyte access, high electronic conductivity, short charge-transportation paths, and rapid Na+ reaction kinetics. When applied as Na-ion battery anodes, the TiO2@NC hollow spheres exhibited excellent electrochemical performance, which afforded a high reversible capacity of 260.4 mAh g−1 at a rate of 0.25C after 300 cycles and was 108.2 mAh g−1 at 10C even after 10000 cycles, with excellent cycling stability (95.8% retention of the maximum capacity). This superhigh cycling stability is among the highest reported for TiO2/C-based anode materials in Na-ion batteries. © 2019 Elsevier Ltd
语种:
英文
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一种负载花球状硫化铜-钯核壳结构的氮掺杂石墨烯复合材料及其制备方法与应用
发明/设计人:
李俊华;范文娟;田亚玲;许志锋;刘梦琴;...
申请/专利权人:
衡阳师范学院
申请/专利号:
201910684848.3
申请时间:
2019.07.26
公开号:
110412095B
公开时间:
2019.11.05
主申请人地址:
湖南省衡阳市雁峰区黄白路165号
摘要:
本发明公开了一种负载花球状硫化铜‑钯核壳结构的氮掺杂石墨烯复合材料及其制备方法与应用。所述负载花球状硫化铜‑钯核壳结构的氮掺杂石墨烯复合材料的制备方法,其包含如下步骤:S11.称取CuCl2、硫脲,分散在水和N,N‑二甲基甲酰胺的混合溶剂中,搅拌后,倒进反应釜中反应得到硫化铜产品;S12.称取氮掺杂石墨烯分散在水中得氮掺杂石墨烯分散液;S13.制备PdCl2溶液;S14.制备NaBH4溶液;S15.制备硫化铜和PdCl2的混合物;S16.在搅拌条件下向硫化铜和PdCl2的混合物中先后逐滴加入NaBH4溶液和氮掺杂石墨烯分散液得负载花球状硫化铜‑钯核壳结构的氮掺杂石墨烯复合材料。由该材料制备得到的修饰电极用于检测黄嘌呤,具有线性范围宽、灵敏度高和检出限低等优点。
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一种纳米级Ni-Fe普鲁士蓝类似物材料及其制备方法与电化学检测邻硝基酚的应用
发明/设计人:
李俊华;陆雨桐;许志锋;刘梦琴;易正戟;...
申请/专利权人:
衡阳师范学院
申请/专利号:
CN201910684178.5
申请时间:
2019-07-26
公开号:
CN110297025A
公开时间:
2019-10-01
主申请人地址:
421000 湖南省衡阳市雁峰区黄白路165号
摘要:
本发明公开了一种纳米级Ni‑Fe普鲁士蓝类似物材料及其制备方法与电化学检测邻硝基酚的应用。所述的纳米级Ni‑Fe普鲁士蓝类似物材料的制备方法,其包含如下步骤:S11.K3[Fe(CN)6]溶解于去离子水中形成A液;S12.将NiCl2·6H2O和柠檬酸钠溶解于去离子水中形成B液;S13.在搅拌条件下,将A液滴加至B液中;全部滴加完成后持续搅拌反应16~32h;S14.反应完成后,产物经静置、离心分离得到沉淀,沉淀洗涤干燥后得纳米级Ni‑Fe普鲁士蓝类似物材料。利用该材料制备得到的化学修饰电极能明显改善其对邻硝基酚的电催化性能,能优化该电极检测邻硝基酚的灵敏度、选择性和检出限等;该化学修饰电极可以用于水中邻硝基酚的定量检测。
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Morphology-controlled electrochemical sensing properties of CuS crystals for tartrazine and sunset yellow
作者:
Li, Junhua;Liu, Mengqin;Jiang, Jianbo;Liu, Beibei;Tong, Haixia;...
期刊:
Sensors and Actuators B-Chemical ,2019年288:552-563 ISSN:0925-4005
通讯作者:
Qian, Dong
作者机构:
[Liu, Mengqin; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Hunan Prov Univ Key Lab Funct Orgcmometall Mat, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Li, Junhua; Jiang, Jianbo; Liu, Beibei; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilisat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Tong, Haixia] Changsha Univ Sci & Technol, Inst Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Qian, Dong] C;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilisat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.
关键词:
CuS crystals;Morphology-controlled syntheses;Electrochemical sensing;Tartrazine;Sunset yellow
摘要:
In this work, we demonstrate the morphology-controllable syntheses of CuS crystals by a facile hydrothermal/solvothermal method through merely changing the reaction solvents without employing any surfactants, templates or structure-directing agents. The dependence of electrochemical sensing properties for tartrazine (TT) and sunset yellow (SY) on the morphologies of CuS crystals (microspheres, hexagonal microsheets, sandwich-like plates, interlaced nanosheets and nanoflowers) was studied by voltammetric techniques. Among these CuS structures, the CuS nanoflowers constructed by textile-like nanosheets with a three-dimensional (3D) hierarchical porous structure hold the largest Brunauer–Emmett–Teller specific surface area (37.12 m2 g−1) and display the highest electrocatalytic activities to the TT and SY oxidations. Consequently, the CuS nanoflowers modified electrode exhibits outstanding electrochemical sensing performances, i.e. high sensitivities of 1.7331 and 0.2260 A M−1 for TT, and 0.4228 and 0.01564 A M−1 for SY, low detection limits of 0.012 μM for TT and 0.006 μM for SY, and satisfactory recoveries of 97.0–104.5% for TT and 99.0–105.0% for SY. Simultaneously, it also features excellent anti-interference, stability and reproducibility. The superior sensing performance of CuS nanoflowers may benefit from its unique 3D hierarchical porous architecture, which can facilitate the electrolyte infiltration and promote the active material utilization efficiency. Based on these findings, we can draw a reasonable conclusion that CuS with a flower-like structure is promising electrocatalysts for efficiently sensing TT and SY. © 2019 Elsevier B.V.
语种:
英文
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Sol–gel synthesis of K1.33Mn8O16 nanorods and their applications for aqueous K-ion hybrid supercapacitors
作者:
Jiang, Jianbo* ;Li, Junhua;Long, Xuanda;Zhao, Dan;Su, Kanda;...
期刊:
Materials Research Bulletin ,2019年109:29-33 ISSN:0025-5408
通讯作者:
Jiang, Jianbo;Qian, Dong
作者机构:
[Long, Xuanda; Li, Junhua; Xv, Deyao; Jiang, Jianbo; Zhao, Dan; Su, Kanda; Qian, Dong] Cent S Univ, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Natl Demonstrat Ctr Expt Chem Educ, Jishou 416000, Peoples R China.;[Qian, Dong] Cent S Univ, Hunan Prov Key Lab Chem Power Resources, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Jiang, JB; Qian, D] C;Cent S Univ, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.
关键词:
A. Inorganic compounds;A. Nanostructures;B. Sol–gel chemistry;D. Electrochemical properties;D. Energy storage
摘要:
K1.33Mn8O16 nanorods were successfully prepared by a facile sol–gel method with KHCO3, Mn(Ac)2 and citrate acid as raw materials. The cyclic voltammetry results demonstrate that the K1.33Mn8O16 nanorods exhibit a quasi-reversible K+ intercalation/deintercalation behavior in a 0.5 M K2SO4 aqueous solution. It has also been found that the assembled activated carbon (AC)//K1.33Mn8O16 asymmetric hybrid supercapacitor delivers an energy density of 17.74 Wh kg−1 at a power density of 210 W kg−1, and an energy density of 8.18 Wh kg−1 at a high power density of 2124 W kg−1. Moreover, the AC//K1.33Mn8O16 supercapacitor shows a good cycling property. To the best of our knowledge, the synthesis of K1.33Mn8O16 nanorods via the sol–gel route and the use of K1.33Mn8O16 in supercapacitors are reported for the first time. © 2018 Elsevier Ltd
语种:
英文
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Self-supported hierarchical bead-chain graphite felt@FePO4@polyaniline: A flexible electrode for all-solid-state supercapacitors with ultrahigh energy density
作者:
Wang, Zhiyu;Shen, Miao;Liu, Tiancheng;Yang, Chunming* ;Li, Junhua;...
期刊:
Chemical Engineering Journal ,2019年361:342-352 ISSN:1385-8947
通讯作者:
Yang, Chunming;Qian, Dong
作者机构:
[Shen, Miao; Liu, Tiancheng; Yang, Chunming; Wang, Zhiyu] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Natl & Local United Engn Lab New Petrochem Mat, Changsha 410081, Hunan, Peoples R China.;[Shen, Miao; Liu, Tiancheng; Yang, Chunming; Wang, Zhiyu] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Li, Junhua; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Qian, Dong] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China.
通讯机构:
[Yang, Chunming] H;[Qian, Dong] C;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Natl & Local United Engn Lab New Petrochem Mat, Changsha 410081, Hunan, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ China, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.
关键词:
All-solid-state flexible supercapacitors;Energy density;Graphite [email protected] 4 @polyaniline;Preparation
摘要:
The relatively low energy density of all-solid-state flexible supercapacitors (AFSCs) is the major bottleneck for their practical applications. Hence, rational designs and constructions of highly desirable hybrid electrodes with ultrahigh energy densities for AFSCs are critically important but challenging. Herein, we report a design of a novel hierarchical graphite felt (GF)@FePO4@polyaniline (PANI) bead-chain hybrid with three-dimensional networking PANI-coated FePO4 nanorods as beads and high conductive carbon fibers of GF as links. Benefiting from the robust synergistic effect between FePO4 and PANI together with plentiful conductive networks emanating from the intimate contacts among GF, FePO4 and PANI, the GF@FePO4@PANI hybrid exhibits overwhelmingly superior supercapacitive performance to GF@FePO4 and GF@PANI. More strikingly, with GF@FePO4@PANI as the binder-free electrode, the assembled symmetric AFSC device shows an ultrahigh energy density of 90.2 Wh kg−1 at a power density of 142.9 W kg−1, and 29.0 Wh kg−1 even at an elevated power density of 5714.6 W kg−1, which are amongst the top of the reported analogous flexible devices. To the best of our knowledge, this is the first report on the fabrication of GF@FePO4@PANI for AFSC applications. © 2018 Elsevier B.V.
语种:
英文
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Self-Supported Hierarchical IrO2@NiO Nanoflake Arrays as an Efficient and Durable Catalyst for Electrochemical Oxygen Evolution
作者:
Liu, Jinlong;Wang, Zhenyu;Su, Kanda;Xv, Deyao;Zhao, Dan;...
期刊:
ACS Applied Materials & Interfaces ,2019年11(29):25854-25862 ISSN:1944-8244
通讯作者:
Qian, Dong;Yang, Chunming;Lu, Zhouguang
作者机构:
[Liu, Jinlong; Xv, Deyao; Su, Kanda; Zhao, Dan; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.;[Liu, Jinlong] Univ Cambridge, Dept Engn, Cambridge CB3 OFA, England.;[Lu, Zhouguang; Wang, Zhenyu] South Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518005, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构:
[Qian, Dong] C;[Yang, Chunming] H;[Lu, Zhouguang] S;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Hunan, Peoples R China.;Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
关键词:
iridium dioxide;nickel oxide;nanoflake array;electrocatalyst;oxygen evolution
摘要:
Although traditional IrO2 nanoparticles loaded on a carbon support (IrO2@C) have been taken as a benchmark catalyst for the oxygen evolution reaction (OER), their catalytic efficiency, operation stability, and IrO2 utilization are far from satisfactory due to the inferior powdery structure and inevitable corrosion of both IrO2 and C under the oxidizing potentials. Here, a rational design of a self-supported hierarchical nanocomposite, composed of IrO2@NiO nanoparticle-built porous nanoflake arrays vertically growing on nickel foam, is proposed, which is demonstrated as a versatile strategy to achieve improved OER activity, remarkable long-term stability, and significantly reduced loading of IrO2 (0.62 atom %). Impressively, the resultant catalyst drives a steady OER current density of 10 mA cm-2, requiring 278 mV overpotential in 1.0 M KOH electrolyte for 25 h and outmaneuvring commercial IrO2@C with much higher mass loading. Further electrochemical investigation and mechanism analysis disclose that the greatly improved electrocatalytic activity stems from the advantageous hierarchical structure and the synergistic effect between IrO2 and underlying potential-induced NiOOH, whereas the outstanding durability is attributed to the unique role of NiO in preventing IrO2 dissolution. © 2019 American Chemical Society.
语种:
英文
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One-Carbon Incorporation Using Cyclobutanone Oxime Ester Enabled [2 + 2 + 1] Carboannulation of 1,7-Enynes by C–C/N–O Bond Cleavage and C–H Functionalization
作者:
Yu, Jiang-Xi;Teng, Fan* ;Xiang, Jian-Nan;Deng, Wei* ;Li, Jin-Heng*
期刊:
Organic Letters ,2019年21(23):9434-9437 ISSN:1523-7060
通讯作者:
Teng, Fan;Deng, Wei;Li, Jin-Heng
作者机构:
[Teng, Fan; Xiang, Jian-Nan; Li, Jin-Heng; Teng, F; Deng, Wei; Yu, Jiang-Xi] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Li, Jin-Heng; Yu, Jiang-Xi] Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Organometall Mat, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Teng, Fan; Li, Jin-Heng; Teng, F] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
通讯机构:
[Teng, F; Deng, W; Li, JH; Li, Jin-Heng] H;[Teng, F; Li, JH] N;Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Organometall Mat, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
摘要:
A NiCl2-promoted [2 + 2 + 1] carboannulation of 1,7-enynes with internally oxidative cyclobutanone oximes to produce canyo-functionalized 4H-cyclopenta[c]quinolin-4-ones is disclosed. Through C-C/N-O bond cleavage and C-H functionalization, the process enables one-carbon incorporation using cyclobutanone oximes to achieve [2 + 2 + 1] carboannulation of 1,7-enynes, which is highlighted by allowing the formation of four new bonds with high selectivity and broad substrate scope.
语种:
英文
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Polyaniline sensitized Pt@TiO2 for visible-light-driven H2 generation
作者:
Liu, Xing* ;Lai, Hua* ;Li, Junhua;Peng, Gang;Yi, Zhengji;...
期刊:
International Journal of Hydrogen Energy ,2019年44(10):4698-4706 ISSN:0360-3199
通讯作者:
Liu, Xing;Lai, Hua
作者机构:
[Liu, Xing; Lai, Hua; Peng, Gang; Li, Junhua; Wang, Mengyao; Zeng, Rongying; Liu, Zhenbin; Liu, X; Lai, H; Yi, Zhengji] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Liu, Xing; Lai, Hua; Peng, Gang; Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Coll Hunan Prov, Hengyang 421008, Peoples R China.;[Liu, Xing; Lai, Hua; Peng, Gang; Li, Junhua; Yi, Zhengji] Hengyang Normal Univ, Key Lab Funct Organometall Mat, Coll Hunan Prov, Hengyang 421008, Peoples R China.
通讯机构:
[Liu, X; Lai, H] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词:
Polyaniline;TiO2;Photocatalysis;Hydrogen generation
摘要:
Polyaniline is a typical conducting polymer with high migration electron rate, good stability, eco-friendly properties, and high absorption coefficients for visible light. In the present study, polyaniline decorated Pt@TiO2 for visible light-driven H-2 generation is reported for the first time. The above-mentioned nanocomposite is prepared through a simple oxidative-polymerization and characterized by infrared spectroscopy, transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, and ultraviolet visible diffuse reflectance spectra. Polyaniline modification improves the absorption of the nanocomposite in visible light region via a photosensitization effect similar to dye sensitization but does not influence the crystal structure and size of Pt@TiO2. The polyaniline modified Pt@TiO2 exhibits a remarkable visible light activity (61.8 mu mol h(-1) g(-1)) and good stability for H-2 generation (with an average apparent quantum yield of 10.1%) with thioglycolic acid as an electron donor. This work provides new insights into using conducting polymers, including polyaniline, as a sensitizer to modify Pt@TiO2 for visible-light hydrogen generation. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
语种:
英文
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Sulfur Incorporation Using Disulfanes as the Sulfur Atom Source Enabled Metal‐Free Heteroannulation of 1,7‐Enynes
作者:
Qin, Jing-Hao;Yu, Jiang-Xi;Li, Jin-Heng* ;An, De-Lie*
期刊:
Advanced Synthesis & Catalysis ,2019年361(17):3974-3979 ISSN:1615-4150
通讯作者:
Li, Jin-Heng;An, De-Lie
作者机构:
[Qin, Jing-Hao; Li, Jin-Heng; An, De-Lie; Yu, Jiang-Xi] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Li, Jin-Heng; Yu, Jiang-Xi] Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Qin, Jing-Hao; Li, Jin-Heng; Yu, Jiang-Xi] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
通讯机构:
[Li, JH; An, DL; Li, Jin-Heng] H;[Li, Jin-Heng] N;Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
关键词:
enynes;disulfanes;heterocycles;oxidant;heteroannulation
摘要:
A new oxidative [2+2+1] heteroannulation of 1,7-enynes with disulfanes promoted by Et3N, producing 3,3a-dihydro-thieno[3,4-c]quinolin-4(5H)-ones, is described. This reaction is achieved by using equivalent amounts of 1,7-enynes, sulfur atoms (disulfanes), tert-butyl peroxybenzoate (TBPB) as an oxidant and Et3N as the base, and represents an unprecedented strategy to applications of disulfanes as sulfur atom sources in synthesis.
语种:
英文
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Modification of mesoporous silica with molecular imprinting technology: A facile strategy for achieving rapid and specific adsorption
作者:
Xu, Zhifeng* ;Deng, Peihong;Li, Junhua;Tang, Siping;Cui, Ying
期刊:
Materials Science and Engineering C: Materials for Biological Applications ,2019年94:684-693 ISSN:0928-4931
通讯作者:
Xu, Zhifeng
作者机构:
[Tang, Siping; Deng, Peihong; Xu, Zhifeng; Li, Junhua; Cui, Ying] Hengyang Normal Univ, Coll Chem & Mat Sci, Key Lab Funct Organometall Mat Hunan Prov Univ, Hengyang 421008, Peoples R China.;[Xu, Zhifeng] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
通讯机构:
[Xu, Zhifeng] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词:
Mesoporous silica;SBA-15;Molecular imprinting Click reactio;2, 4-Dichlorophenoxyacetic acid
摘要:
In order to improve the diffusion kinetics of molecularly imprinted materials (MIMs), applying imprinting technology to mesoporous materials is a promising strategy. In the present study, an imprinting approach based on the combination of mesoporous silica materials and molecular imprinting technology is reported. Molecularly imprinted material (MIM) for 2,4-dichlorophenoxyacetic acid (2,4-D) was prepared by using 2,4-D as the template molecule, alkyne-modified β-cyclodextrin and propargyl amine as the combinatorial functional monomers and SBA-15 as the supporter. The functional monomers were anchored to the azide-modified SBA-15 by azide–alkyne Click reaction. The synthesized MIM was characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), thermal gravimetric analysis (TGA), low-angle X-ray diffraction (XRD) and N 2 adsorption–desorption analysis. The interactions between template and functional monomers were studied by proton NMR analysis and UV–vis experiments. The results of the equilibrium binding experiments and selective tests showed that the prepared MIM has binding affinity and specificity for a group of analytes which have similar size and shape to those of template. Binding kinetic experiments demonstrated that the present imprinting approach can effectively enhance the mass transfer rate. The solid phase extraction of 2,4-D using MIM as the adsorbent was investigated. The extraction conditions for the processes of loading, washing and eluting were optimized. The recoveries of the molecularly imprinted solid phase extraction (MISPE) column for 2,4-D were 76.3–88.9% with relative standard deviations (RSD) of 3.48–7.64%. © 2018 Elsevier B.V.
语种:
英文
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Metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates toward thieno[3,4-c]quinolin-4(5H)-ones
作者:
Yu, Jiang-Xi* ;Niu, Shijie;Hu, Ming;Xiang, Jian-Nan;Li, Jin-Heng*
期刊:
Chemical Communications ,2019年55(47):6727-6730 ISSN:1359-7345
通讯作者:
Yu, Jiang-Xi;Li, Jin-Heng
作者机构:
[Xiang, Jian-Nan; Yu, Jiang-Xi; Li, Jin-Heng; Niu, Shijie] Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Yu, Jiang-Xi; Li, Jin-Heng] Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Yu, Jiang-Xi; Li, Jin-Heng; Hu, Ming] Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
通讯机构:
[Yu, JX; Li, JH] H;[Yu, JX; Li, JH] N;Hunan Univ, State Key Lab Chemo Biosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;Hengyang Normal Univ, Univ Hunan Prov, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;Nanchang Hangkong Univ, Key Lab Jiangxi Prov Persistent Pollutants Contro, Nanchang 330063, Jiangxi, Peoples R China.
摘要:
A new metal-free oxidative [2+2+1] heteroannulation of 1,7-enynes with thiocyanates for producing thieno[3,4-c]quinolin-4(5H)-ones is presented. This reaction employs benzoylperoxide (BPO) as the oxidant and sodium thiocyanate as the sulfur source to enable the formation of three chemical bonds, two C-S bonds and one C-C bond, in a single reaction, and represents a new, practical access to S-heterocycles with the avoidance of the use of metal catalysts and excess bases. © 2019 The Royal Society of Chemistry.
语种:
英文
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石墨烯-聚乙烯吡咯烷酮复合膜修饰电极用于抗坏血酸和芦丁的同时测定
作者:
邓培红;刘晓鹏;贺全国;李俊华
期刊:
衡阳师范学院学报 ,2018年39(03):62-67 ISSN:1673-0313
作者机构:
衡阳师范学院 化学与材料科学学院,湖南 衡阳,421008;衡阳师范学院 化学与材料科学学院,湖南 衡阳 421008;湖南工业大学 绿色包装与生物纳米技术应用湖南省重点实验室,湖南 株洲 412007;湖南工业大学 绿色包装与生物纳米技术应用湖南省重点实验室,湖南 株洲,412007;[贺全国] 湖南工业大学
关键词:
石墨烯;聚乙烯吡咯烷酮;修饰电极;抗坏血酸;芦丁;二阶导数线性扫描伏安法
摘要:
用聚乙烯吡咯烷酮(PVP)分散石墨烯(GR),通过滴涂法制备了石墨烯-聚乙烯吡咯烷酮复合膜修饰玻碳电极(GR-PVP/GCE),在0.05 mol/L HCl溶液中,采用循环伏安法和二阶导数线性扫描伏安法研究了抗坏血酸(AA)和芦丁(Ru)在该修饰电极上的电化学行为.结果显示,GR-PVP/GCE对AA和Ru的氧化显示出高的电催化活性和良好的电分离作用,二者峰电位之差为196 mV.在最佳实验条件下,当1.0×10-5 mol/L Ru存在时,AA的氧化峰电流与其浓度在6.0×10-6~1.0×10-3 mol/L范围内呈良好的线性关系,检出限为2.0×10-6 mol/L.而当1.0×10-4 mol/L AA存在时,Ru的氧化峰电流与其浓度在2.0×10-8~1.0×10-5 mol/L和1.0×10-5~8.0×10-5 mol/L范围内呈良好的线性关系,检出限为1.0×10-8 mol/L.该修饰电极可成功用于药物中AA和Ru的同时测定.
语种:
中文
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Fluorescent ion-imprinted sensor for selective and sensitive detection of copper (II) ions
作者:
Xu, Zhifeng* ;Deng, Peihong;Li, Junhua;Tang, Siping
期刊:
Sensors and Actuators B-Chemical ,2018年255(Pt.2):2095-2104 ISSN:0925-4005
通讯作者:
Xu, Zhifeng
作者机构:
[Tang, Siping; Deng, Peihong; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Tang, Siping; Deng, Peihong; Xu, Zhifeng; Li, Junhua] Hunan Prov Univ, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.
通讯机构:
[Xu, Zhifeng] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.
关键词:
Copper (II) ion;Ion imprinted polymer;1,8-naphthalimide;Ion recognition;Fluorescence emission
摘要:
In the present study, a fluorescent ion-imprinted sensor (FIIS) for rapid and convenient detection of Cu2+ ions was fabricated. A fluorescent polymerizable ligand, i.e., 4-(2-aminomethyl)pyridine-N-allylnaphthalimide, was designed and synthesized. The FIIS was prepared by surface functionalization of PVDF membrane with a thin layer of copper (II) ion-imprinted polymer using the synthesized ligand as the fluorescent functional monomer. The intensity of fluorescence emission of FIIS decreased linearly with the increase of copper (II) ions concentration in the range of 0-70.0 mu M. The results of selectivity tests indicated that FIIS has high specific recognition ability for Cu2+ ions. The recoveries for the spiked samples were in the range of 96.4-104.4%, and the relative standard deviations (RSDs) were found to be 2.17-4.75%. The FIIS was successfully applied to the determination of copper (II) ions in real water samples. The Limits of detection (LODs) for Cu2+ ions in real water samples were in the range of 0.11-0.14 uM. The present study provided a feasible strategy for construction of fluorescent ion-imprinted sensor for convenient, sensitive and selective detection of metal ions. (C) 2017 Elsevier B.V. All rights reserved.
语种:
英文
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Facile synthesis of Ag@Cu2 O heterogeneous nanocrystals decorated N-doped reduced graphene oxide with enhanced electrocatalytic activity for ultrasensitive detection of H2 O2
作者:
Li, Junhua;Jiang, Jianbo;Xu, Zhifeng;Liu, Mengqin;Tang, Siping;...
期刊:
Sensors and Actuators B-Chemical ,2018年260:529-540 ISSN:0925-4005
通讯作者:
Qian, Dong
作者机构:
[Tang, Siping; Liu, Mengqin; Xu, Zhifeng; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Peoples R China.;[Li, Junhua; Jiang, Jianbo; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Qian, Dong] C;Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China.
关键词:
Hydrogen peroxide;Nonenzymatic sensor;Ultrasensitive detection;Ag@Cu2O nanocrystals;N-doped reduced graphene oxide
摘要:
A nanohybrid composed of Ag@Cu2O heterogeneous nanocrystals supported on N-doped reduced graphene oxide (Ag@Cu2O/N-RGO) has been synthesized by a simple wet-chemical method. The resultant composite consists of N-RGO sheets fully and homogeneously coated with a dense layer of Ag@Cu2O nanocrystals. Both Ag and N-RGO are in direct contact with Cu2O, and Ag nanoparticles with sizes of 2-5 nm are mainly deposited on the surface of Cu2O cubes (edge length of 500 nm). The electrochemical studies reveal that the ternary Ag@Cu2O/N-RGO composite exhibit significantly enhanced electrocatalytic activity for H2O2 sensing compared with either the single component (N-RGO) or two component systems (Cu2O/N-RGO and Ag/N-RGO), which is mainly due to the synergetic catalysis of the ternary system. The nonenzymatic sensor based on Ag@Cu2O/N-RGO composite shows overwhelmingly superior comprehensive performance for the H2O2 detection over the documented Ag-based sensors. More specifically, it displays a rapid response (10 s) to H2O2 over a wide linear range of 54-700 nM with a high sensitivity of 1298.3 mu A mM(-1) cm(-2) and a low detection limit of 10 nM. Moreover, the sensor also exhibits the preferable selectivity in the presence of biologically coactive compounds accompanied with long-term stability and good reproducibility. (C) 2018 Elsevier B.V. All rights reserved.
语种:
英文
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Facile synthesis of Pd/N-doped reduced graphene oxide via a moderate wet-chemical route for non-enzymatic electrochemical detection of estradiol
作者:
Li, Junhua;Jiang, Jianbo;Zhao, Dan;Xu, Zhifeng;Liu, Mengqin;...
期刊:
Journal of Alloys and Compounds ,2018年769:566-575 ISSN:0925-8388
通讯作者:
Xie, Haobin;Qian, Dong
作者机构:
[Liu, Xing; Liu, Mengqin; Deng, Peihong; Xu, Zhifeng; Xie, Haobin; Li, Junhua] Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[Li, Junhua; Jiang, Jianbo; Zhao, Dan; Qian, Dong] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.;[Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hunan Prov Univ Key Lab Funct Organometall Mat, Hengyang 421008, Peoples R China.;[Jiang, Jianbo] Jishou Univ, Coll Chem & Chem Engn, Jishou 416000, Peoples R China.;[Yang, Chunming] Hunan Normal Univ, Coll Chem & Chem Engn, Changsha 410081, Hunan, Peoples R China.
通讯机构:
[Xie, Haobin] H;[Qian, Dong] C;Hengyang Normal Univ, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Changsha 410083, Hunan, Peoples R China.
关键词:
N-doped reduced graphene oxide;Pd nanoparticles;Electrochemical detection;Estradiol;Wet-chemical method
摘要:
In this work, Pd-decorated N-doped reduced graphene oxide (Pd/N-RGO) was successfully synthesized by a simple wet-chemical method without using any capping agent and stabilizer. The synthesized Pd/N-RGO composite has been carefully characterized by various techniques. The X-ray photoelectron spectra provide the evidence of successful incorporation of N into the N-RGO sheets, while the presence of Pd nanoparticles with the sizes of 5-20 nm on the N-RGO sheets was confirmed by the transmission electron microscopy. By integrating the advantages of the large surface area of N-RGO sheets and good electron transfer efficiency of Pd nanoparticles, the Pd/N-RGO-based sensor shows an improved electrocatalytic activity toward the estradiol oxidation. Therefore, the Pd/N-RGO composite can be used as an effective sensing platform for the non-enzymatic detection of estradiol. It also demonstrates that the fabricated sensor has two linear concentration ranges (0.1-2 and 2-400 mu M) and a low detection limit (1.8 nM) for the estradiol detection. Finally, the resulting sensor was successfully used to detect estradiol in some real samples and the satisfactory recoveries of 96.0-103.9% were obtained. The prepared Pd/N-RGO composite with more distinct merits including simple manufacture, preferable reproducibility and long-term stability can be a promising candidate for the advanced electrode material in sensing applications. (C) 2018 Elsevier B.V. All rights reserved.
语种:
英文
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