Citation: XU Li, QIAO Jin-Li, DING Lei, HU Long-Yu, LIU Ling-Ling, WANG Hai-Jiang. Electrocatalytic Activity of CoPy/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte[J]. Acta Physico-Chimica Sinica, ;2011, 27(10): 2251-2254. doi: 10.3866/PKU.WHXB20111015 shu

Electrocatalytic Activity of CoPy/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte

1.
1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, P. R. China;
2. Institute for Fuel Cell Innovation, National Research Council Canada, Vancouver, B.C., V6T 1W5, Canada

Received Date: 11 July 2011
Available Online: 18 August 2011
Fund Project: 国家自然科学基金(21173039) (21173039) 上海市浦江人才基金(08PJ14096) (08PJ14096) 上海市自然科学基金(09ZR1433300) (09ZR1433300) 浙江省重中之重学科开放基金(20110927) (20110927) 教育部归国留学人员基金(2009(1001)) (2009(1001))上海市重点学科项目(B604)资助 (B604)

In this communication, we report a novel CoPy/C catalyst for the oxygen reduction reaction (ORR) in alkaline electrolyte using cobalt sulfate heptahydrate (CoSO₄·7H₂O) and pyridine (Py) as the Co and N precursors supported on Vulcan XC-72R, followed by heat treatment in an inert atmosphere. Electrochemical performances were evaluated using cyclic voltammograms (CVs) and rotating disk electrode (RDE) technique in terms of its ORR activity as a function of Co content in the catalyst synthesis. Results show that the presence of Co in the CoPy/C catalyst greatly affects the formation of ORR catalytic active sites and that the best performing catalyst is 10%Co%30Py/C, which was synthesized at 800°C. In 3.0 mol·L^-1 KOH, 10%Co30%Py/C (in O₂) produces an obvious ORR current with an on-set potential at 0.014 V. Compared with the 40% Py/C the on-set potential of the 10% Co30% Py/C for oxygen reduction shifted positively by 71 mV (versus RHE (reversible hydrogen electrode)) and a well-defined limiting current plateau was achieved. Therefore, a maximum current density of 1.0 mA·cm^-2 was obtained at -0.16 V with a half-wave potential of -0.07 V. Transmission electron microscopy (TEM) measurements show that the nanoparticles with a diameter of 20 nm are uniformly dispersed on Vulcan carbon (Vulcan XC-72R).
- Alkaline fuel cell,
- CoPy/C,
- Heat treatment,
- Oxygen reduction reaction,
- Cyclic voltammogram,
- Rotating disk electrode
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