Highly active carbon-supported Pt nanoparticles modified and dealloyed with Co for the oxygen reduction reaction

被引:29
作者
Li, Bing [1 ,2 ]
Yan, Zeyu [1 ,2 ]
Xiao, Qiangfeng [3 ]
Dai, Jun [1 ,2 ]
Yang, Daijun [1 ,2 ]
Zhang, Cunman [1 ,2 ]
Cai, Mei [3 ]
Ma, Jianxin [1 ,2 ]
机构
[1] Tongji Univ, Sch Automot Studies, Shanghai 201804, Peoples R China
[2] Tongji Univ, Clean Energy Automot Engn Ctr, Shanghai 201804, Peoples R China
[3] Gen Motors, Ctr Res & Dev, Warren, MI 48090 USA
关键词
Ethylene glycol (EG); PtCo/C; Dealloying; Oxygen reduction reaction (ORR); Proton exchange membrane fuel cell (PEMFC); CATALYTIC-ACTIVITY; PARTICLE-SIZE; IR-V/C; PT-CU; ELECTROCATALYSTS; PERFORMANCE; CR; NI;
D O I
10.1016/j.jpowsour.2014.07.056
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Highly active carbon-supported Pt modified with transition metal Co catalysts are synthesized by an ethylene glycol (EG) reduction method as cathode electro-catalyst for proton exchange membrane fuel cell (PEMFC) applications. Synthesis conditions, such as precursor, dealloying and heat treatment are investigated to obtain the PtCo/C catalyst with the optimum performance. The active component particles are uniformly dispersed on Vulcan XC-72 support with a narrow particle size distribution centered around 2-4 nm. Energy dispersive X-ray spectroscopy (EDX) results indicate that the catalyst sample contains negligible Co contents with the addition of HCl. Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) reveal that the PtCo/C electro-catalyst with cobalt (II) acetate tetrahydrate as precursor shows better performance than commercial Pt/C, for which electrochemical surface area and oxygen reduction reaction (ORR) performance of mass activity are as high as 54.25 m(2) g(pt)(-1) and 0.089 A mg(Pt)(-1), respectively. Membrane electrode assemblies (MEAs) prepared with all as-synthesized electro-catalyst samples are tested under different temperatures and relative humidity conditions. The PtCo/C electro-catalyst synthesized with cobalt (II) acetate tetrahydrate as precursor also exhibits highest MEA power density. Herein, the as-synthesized PtCo/C is considered to be promising cathode electro-catalyst to improve the utilization of platinum in PEMFC applications. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:201 / 207
页数:7
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