Abstract
The Direct Borohydride Fuel Cell, a potential high-energy-density portable generator, remains limited by the sluggish borohydride oxidation reaction (BOR) kinetics, the mechanism of which is not completely understood. Nevertheless, one usually admits that gold promotes the complete 8-electron BOR. In the present paper, by coupling on line Mass Spectrometry to electrochemistry (OLEMS), we in situ monitored the H2 yield during BOR experiments on sputtered gold electrodes. Our results show non-negligible H2 generation on Au on the whole BOR potential range (0 - 0.8 V vs. RHE), thus revealing that gold cannot be considered as a faradaic-efficient BOR electrocatalyst. From this fact and knowing gold yields slow BOR kinetics, one may conclude that Au is not an ideal electrocatalyst for DBFC anodes.
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