Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 11, Pages 4037-4043Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.02.006
Keywords
Direct formic acid fuel cell; Catalyst; Platinum; Bismuth; Decoration co-deposition
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Tekion (Canada) Inc.
- Memorial University
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Carbon supported PtBi bimetallic catalysts (PtBi/C) prepared by depositing Bi on a commercial Pt/C catalyst and by codeposition of Pt and Bi have been compared for formic acid oxidation in a multi-anode direct formic acid fuel cell. Both types of catalyst gave much higher cell performances than the Pt/C, with only low amounts of Bi (Pt to Bi mole ratios of 11:1 and 14:1, respectively) required for optimum performance. The high Pt to Bi ratio for the best codeposited catalyst indicates that the Bi was concentrated at the surface, and this is consistent with X-ray diffraction and X-ray photoelectron spectroscopy results. However, cyclic voltammetry revealed a strong electronic effect that is inconsistent with surface decoration. The effects of the Bi have been attributed to selective blocking of sites at which CO is formed. (C) 2011 Elsevier Ltd. All rights reserved.
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