We demonstrate an extremely facile in-situ pyrolysis followed by the reduction of partial Co 2+ route to synthesize novel Ketjen black carbon (KB) supported [email protected]−N−C (denoted as [email protected]−NC/KB) nanochains using KB, urea and cobalt (Ⅱ) acetate as co-precursors. The as-prepared [email protected]/KB displays higher electrocatalytic activity, smaller Tafel slope and better durability for the oxygen evolution reaction than those of the benchmark commercial RuO 2 catalyst in 1.0 M KOH solution, far outperforming the control ...