Use of Cobalt Polyphthalocyanine and Graphene as Precursors to Construct an Efficient Co9S8/N,S‐G Electrocatalyst for the Oxygen Electrode Reaction in Harsh Media

摘要: The oxygen reduction reaction (ORR) and evolution (OER) are fundamental reactions connected with energy conversion and/or storage devices. However, the sluggish kinetics of ORR OER reduce efficiency. To address these issues, development efficient robust electrode catalysts is required desperately. Herein, a new Co9S8 nanocrystal hybrid anchored on N- S-dual-doped graphene (Co9S8/N,S-G) was prepared by two-step method, namely, π–π assembly process p-phenyl-bis(3,4-dicyanophenyl)thioether cobalt polyphthalocyanine (PTCoPPc) oxide pyrolysis procedure. Electrochemical studies demonstrated that Co9S8(800)/N,S-G exhibited comparable performance 20 wt % Pt/C, such as an onset potential half-wave 0.931 0.811 V vs. reversible hydrogen electrode, respectively, limiting current density 5.207 mA cm−2, good long-term stability retention 92.6 % after 10 000 s continuous measurements. Co9S8(900)/N,S-G displayed excellent activity, which ascribed to presence pyridinic N, graphitic occupation Co−N catalyze ORR; adsorption surface contributed significantly activity. approach developed here offered strategy construct catalysts.