Surface Condition Manipulation and Oxygen Reduction Enhancement of PtAu/C Catalysts Synergistically Modified by CeO(2) Addition and N(2) Treatment

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题名:	Surface Condition Manipulation and Oxygen Reduction Enhancement of PtAu/C Catalysts Synergistically Modified by CeO(2) Addition and N(2) Treatment
作者:	Liu,CW;Wei,YC;Wang,KW
贡献者:	材料科學與工程研究所
关键词:	METHANOL FUEL-CELLS;ALLOY NANOPARTICLES;CERIA MODIFICATION;CATHODE CATALYST;ELECTROCATALYSTS;AU;SEGREGATION;PROMOTION;OXIDATION;HYDROGEN
日期:	2011
上传时间:	2012-03-27 16:29:18 (UTC+8)
出版者:	國立中央大學
摘要:	In this study, the electrochemical activity of Pt(50)Au(50)/C toward oxygen reduction reaction has been promoted by the manipulation of their surface condition through CeO(2) addition and N(2) heat treatment synergistically. Pt(50)Au(50)/C with CeO(2) additions (PtAuCe) were prepared by the DP process and then further treated at 520-620 K under N(2). 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 CeO(2) modification, and accordingly in the PtAuCe catalysts, CeO(2)-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
關聯:	JOURNAL OF PHYSICAL CHEMISTRY C
显示于类别:	[材料科學與工程研究所 ] 期刊論文

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