Electrocatalysis of oxygen reduction on a carbon supported platinum-vanadium alloy in polymer electrolyte fuel cells

被引：127
作者：
Antolini, E
Passos, RR
Ticianelli, EA
机构：
[1] USP, Inst Quim Sao Carlos, Dept Quim Fis, BR-13560970 Sao Carlos, SP, Brazil
[2] Scuola Sci Mat, I-16016 Genoa, Italy
来源：
ELECTROCHIMICA ACTA | 2002年 / 48卷 / 03期
基金：
巴西圣保罗研究基金会;
关键词：
dispersed catalysts; oxygen reduction; platinum-vanadium alloy; gas diffusion electrode; polymer electrolyte fuel cell;
D O I：
10.1016/S0013-4686(02)00644-8
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The electrocatalysis of the oxygen reduction reaction (ORR) on carbon supported Pt:V 1:1 catalyst in polymer electrolyte fuel cells (PEFC) was investigated. At an oxygen pressure of 1 atm results indicate a lower electrocatalytic activity for the ORR in the presence of vanadium. However, at an O-2 pressure greater than or equal to 2 atm an enhanced electrocatalytic property of PtV/C compared with Pt/C is revealed. This result indicates the occurrence of a different electrocatalytic mechanism for the ORR on Pt/C and PtV/C. An increase of mass transport overpotentials is observed for the PtV/C catalyst, and this was related to the presence of vanadium oxide. Indeed, XRD analysis revealed that only about 30% of V present in the catalyst is alloyed with Pt, forming a face centred cubic (fcc) Pt3V solid solution. A thermal treatment at 850 degreesC under reducing atmosphere leads to the formation of an ordered fcc Pt2V phase. After this, the ORR activity of PtV/C at O-2 pressure 1 atm is higher than that of Pt/C. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：263 / 270
页数：8
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