期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 11, 期 1, 页码 223-226出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.11.018
关键词
In situ FTIR; DBFC; Gold electrode; Borohydride oxidation; Reaction mechanism
资金
- CLUSTER-Energy Region Rhone-Alpes
The direct borohydride fuel cell (DBFC) is an interesting alternative for the electrochemical power generation at lower temperatures due to its high anode theoretical specific capacity (5 A h g(-1)). However, the borohydride oxidation reaction (BOR) is a very complex eight-electron reaction, influenced by the nature of the electrode material (catalytic or not with respect to BH4- hydrolysis). the [BH4-]/[OH-] ratio and the temperature. In order to understand the BOR mechanism, we performed in situ infrared reflectance spectroscopy measurements (SPAIRS technique) in 1 M NaOH/1 M NaBH4 with the aim to study intermediate reactions occurring on a gold electrode (a poor BH4- hydrolysis catalyst). We monitored several bands in B-H (1184 cm (1)) and B-O bond regions (1326 and 1415 cm (1)), appearing sequentially with increasing electrode polarisation. Thanks to these experimental findings, we propose possible initial elementary steps for the BOR. (C) 2008 Elsevier B.V. All rights reserved.
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