Electrochemical Properties and Durability of Electrocatalysts Supported on SnO 2

For polymer electrolyte fuel cells (PEFCs), carbon corrosion, leading to lower activities of catalysts under cathode conditions, is one of the important technological issues to be solved. We have been developing SnO 2 and Nb-SnO 2 as alternative support materials. In this study, the oxygen reduction...

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Bibliographic Details
Published in:ECS transactions 2013-08, Vol.58 (1), p.1251-1257
Main Authors: Tsukatsune, Takuya, Takabatake, Yuma, Noda, Zhiyun, Hayashi, Akari, Sasaki, Kazunari
Format: Article
Language:English
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Summary:For polymer electrolyte fuel cells (PEFCs), carbon corrosion, leading to lower activities of catalysts under cathode conditions, is one of the important technological issues to be solved. We have been developing SnO 2 and Nb-SnO 2 as alternative support materials. In this study, the oxygen reduction reaction (ORR) activity and the durability of Pt/SnO 2 and Pt/Sn 0.98 Nb 0.02 O 2 against voltage cycling between 1.0 and 1.5 V RHE are quantitatively investigated. Longer ORR durability was verified, compared to the standard catalyst, Pt/Vulcan. Furthermore, we have found that the degradation mechanism of ORR is probably different between carbon black and SnO 2 -based supports. In the case of SnO 2 -based catalysts, degradation arose mainly from the loss of electrochemical surface area (ECSA), while other factors were also involved for Pt/Vulcan. Consequently, SnO 2 is a promising candidate electrocatalyst support material to solve carbon corrosion problems of PEFCs.
ISSN:1938-5862
1938-6737
DOI:10.1149/05801.1251ecst