期刊
ELECTROCHIMICA ACTA
卷 77, 期 -, 页码 104-110出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.05.081
关键词
Oxygen reduction; Underpotential deposition; Gold; PdCo electrocatalyst; Stability
资金
- National Basic Research Program of China [2012CB215500, 2011CB211706]
- Natural Science Foundation of China [21106142]
- 100-Talent Program of the Chinese Academy of Sciences
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.
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