Electrochemical Studies of Novel Pt/Ceria/C Oxygen Reduction Catalysts for Fuel Cells

Novel Pt/ceria/carbon catalysts with sub-2 nm ceria crystallites embedded in carbon matrixes, recently developed at Los Alamos National Laboratory, were studied in aqueous acidic media using rotating ring disk electrode (RRDE) and voltammetric techniques. The ceria nanophase was either pure or doped...

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Bibliographic Details
Main Authors: Chlistunoff, Jerzy, Wilson, Mahlon, Garzón, Fernando
Format: Conference Proceeding
Language:English
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Summary:Novel Pt/ceria/carbon catalysts with sub-2 nm ceria crystallites embedded in carbon matrixes, recently developed at Los Alamos National Laboratory, were studied in aqueous acidic media using rotating ring disk electrode (RRDE) and voltammetric techniques. The ceria nanophase was either pure or doped with trivalent gadolinium or praseodymium. The catalysts with lower Pt contents (3.8-5%) had higher specific surface areas and performed better than those with higher Pt contents (≥8.5%). The doping with either Pr or Gd was found to improve the catalyst specific surface area, whereas Pr doped catalysts exhibited higher specific activities in oxygen reduction reaction (ORR) than non doped and Gd doped catalysts. The former are also more selective for four-electron ORR. The presence of ceria in the catalyst support was found to increase the catalyst tolerance to CO poisoning.
ISSN:1938-5862
1938-6737
DOI:10.1149/1.3635768