期刊
JOURNAL OF POWER SOURCES
卷 325, 期 -, 页码 745-751出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.062
关键词
Oxygen reduction reaction; Platinum; Platinum alloy; Neon ionomer; Rotating disk electrode method; Ionomer coverage
资金
- U.S. Department of Energy, Fuel Cells Technologies Program [DE-AC36-08-GO28308]
- Toyota Central RD Labs., Inc.
The impact of Nafion on the oxygen reduction reaction (ORR) activity is studied for Pt/C and Pt-alloy/C catalysts using thin-film rotating disk electrode (TF-RDE) methods in 0.1 M HClO4. Ultrathin uniform catalyst layers and standardized activity measurement protocols are employed to obtain accurate and reproducible ORR activity. Nafion lowers the ORR activity which plateaus with increasing loading on Pt catalysts. Pt particle size is found not to have significant influence on the extent of the SA decrease upon Nafion incorporation. Catalysts using high surface area carbon (HSC) support exhibit attenuated activity loss resulting from lower ionomer coverage on catalyst particles located within the deep pores. The impact of metallic composition on the activity loss due to Nafion incorporation is also discussed. (C) 2016 Elsevier B.V. All rights reserved.
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