Surface condition manipulation and oxygen reduction enhancement of PtAu/C catalysts synergistically modified by CeO2 addition and N2 treatment

Chen Wei Liu, Yu Chen Wei, Kuan Wen Wang

研究成果: 雜誌貢獻期刊論文同行評審

23 引文 斯高帕斯(Scopus)

摘要

In this study, the electrochemical activity of Pt50Au 50/C toward oxygen reduction reaction has been promoted by the manipulation of their surface condition through CeO2 addition and N2 heat treatment synergistically. Pt50Au50/C with CeO2 additions (PtAuCe) were prepared by the DP process and then further treated at 520-620 K under N2. The surface segregation profile of the PtAuCe alloys and surface-activity correlation has been elucidated systematically by use of the surface analysis and electrochemical characterization. It is observed that the inherent surface segregation of Au of Pt-Au systems at high temperatures based on the thermodynamic models has been changed due to the CeO2 modification, and accordingly in the PtAuCe catalysts, CeO2-induced Pt surface segregation and surface reconstruction takes place. As a result, the variations in surface compositions affect the ORR activity of the Pt-Au catalysts, and the enhancement of Pt or Au surface composition causes the promotion or deterioration in ORR activity for various heat-treated catalysts, respectively

原文???core.languages.en_GB???
頁(從 - 到)8702-8708
頁數7
期刊Journal of Physical Chemistry C
115
發行號17
DOIs
出版狀態已出版 - 5 5月 2011

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