期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 156, 期 5, 页码 B643-B649出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3098478
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资金
- U.S. Army Research Lab [W911NF-07-2-0036]
The objective of this study is to investigate the effect of palladium particle size on catalytic activity for oxygen reduction reactions (ORRs) in alkaline solutions. Carbon-supported palladium catalysts with average Pd particle sizes from 3 to 16.7 nm were obtained by treating a 20% Pd/C catalyst in a H-2/N-2 gas at elevated temperatures from 300 to 600 degrees C, respectively. The specific activity of the Pd/C catalysts for the ORRs, described by a kinetic ORR current (i(k)) normalized to the Pd active surface area, was found to increase continuously by a factor of about 3 with increased particle size from 3 to 16.7 nm without reaching a maximum. The mass activity increased by a factor of 1.3 when Pd particle size increased from 3 to 5 nm and then decreased with increased Pd particle size. The hydrogen peroxide yield on the Pd/C catalysts was negligible, especially in the mixed kinetic-diffusion controlled region, indicating that the four-electron transfer path is dominant for the ORR on the Pd/C in alkaline solutions. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3098478] All rights reserved.
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