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题名: Enhanced activity and stability of a Au decorated Pt/PdCo/C electrocatalyst toward oxygen reduction reaction
作者: Tang, Qiwen1, 2, 3;  Jiang, Luhua1, 2;  Jiang, Qian1, 2, 3;  Wang, Suli1, 2;  Sun, Gongquan1, 2
关键词: Oxygen reduction ;  Underpotential deposition ;  Gold ;  PdCo electrocatalyst ;  Stability
刊名: ELECTROCHIMICA ACTA
发表日期: 2012-08-30
DOI: 10.1016/j.electacta.2012.05.081
卷: 77, 页:104-110
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: Carbon-supported Pt/PdCo and Pt/Au/PdCo catalysts with a low Pt loading were prepared by a combined underpotential deposition and galvanic replacement route. The X-ray diffraction results show that after annealing in H-2/Ar atmosphere, the alloy degree of PdCo is enhanced. The average metal particle size of PdCo/C, PdCo/C-H, Pt/PdCo/C and Pt/Au/PdCo/C, characterized by transmission electron microscopy, is about 2.6, 4.1. 5.3 and 5.5 nm, respectively. The electrochemical characterizations show that the Pt/PdCo/C electrocatalyst exhibits a high activity toward the oxygen reduction reaction (ORR) but is unstable in electrochemical environment. After the accelerated aging tests (AAT), the electrochemical surface area (ECSA) for the Pt/PdCo/C catalyst decreases by 48% and the half-wave potential of the ORR polarization curve (E-1/2) shifts 35 mV negatively. After decorated by Au, both the catalytic activity and stability of the Pt/PdCo/C catalyst are improved significantly. Compared to Pt/PdCo/C, the E-1/2 for Pt/Au/PdCo/C shifts 22 mV toward higher potentials. After the AAT, the ECSA decreases only 26%, and the E-1/2 shifts 13 mV negatively for Pt/Au/PdCo/C. The enhanced catalytic activity and stability should be due to the high resistance to be oxidized for Pt and the suppressed OH adsorption on the Au-decorated Pt surface. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
关键词[WOS]: CORE-SHELL NANOPARTICLES ;  ELECTROLYTE FUEL-CELLS ;  MONOLAYER ELECTROCATALYSTS ;  UNDERPOTENTIAL DEPOSITION ;  CATALYTIC-ACTIVITY ;  REDOX REPLACEMENT ;  CARBON SUPPORT ;  CU ALLOYS ;  SURFACES ;  DURABILITY
语种: 英语
WOS记录号: WOS:000307131300016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138011
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Dalian Natl Lab Clean Energy, Dalian 116023, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

Recommended Citation:
Tang, Qiwen,Jiang, Luhua,Jiang, Qian,et al. Enhanced activity and stability of a Au decorated Pt/PdCo/C electrocatalyst toward oxygen reduction reaction[J]. ELECTROCHIMICA ACTA,2012,77:104-110.
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