Effect of KOH Concentrations on Oxygen Reduction Reaction Catalyzed by CoPy/C Electrocatalyst and Active Site Studies

doi:10.7503/cjcu20120364

Abstract

Abstract:

Nanostructure CoPy catalyst(15Co%25%Py/C, mass fraction) for the oxygen reduction reaction(ORR)was prepared by cobalt sulfate hepathydrate(CoSO₄·7H₂O) and pyridine(Py) as the Co and N precursors supported on Vulcan XC-72R, and followed by heat treatment in an inert atmosphere at 800℃. Electrochemical performances were evaluated using rotating disk electrode(RDE) technique in terms of its ORR activity in electrolytes containing various concentrations of KOH. The results show that the concentration of KOH has significant impact on the ORR performance of the CoPy/C catalyst. In 0.05 mol/L KOH, CoPy/C(in O₂) can produce the obvious ORR current, giving the onset potential at 0.10 V(vs. SHE). The diffusion-limiting current density was 4.39 mA/cm² at -0.381 V. RDE results reveal that CoPy/C catalyst in 0.05 and 0.1 mol/L KOH solution catalyze the ORR via four-electron pathway. XPS analysis indicates that both pyridinic-N and graphitic-N are responsible for the enhanced ORR activity.

Key words: CoPy/C catalyst, Oxygen reduction reaction, KOH concentration, Rotating disk electrode, Active site, Alkaline fuel cell

CLC Number:

O643
O614

TrendMD:

XU Li, DING Lei, DAI Xian-Feng, ZHANG Jing, TIAN Bing-Lun, LIU Shi-Yao, QIAO Jin-Li. Effect of KOH Concentrations on Oxygen Reduction Reaction Catalyzed by CoPy/C Electrocatalyst and Active Site Studies[J]. Chem. J. Chinese Universities, 2013, 34(1): 149.

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Effect of KOH Concentrations on Oxygen Reduction Reaction Catalyzed by CoPy/C Electrocatalyst and Active Site Studies

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