We present a facile thermodynamic strategy for identifying formate electrooxidation at a Pt electrode in a fuel cell. Mixtures of formate and sulfuric acid are used as fuel solutions for maintaining formic acid at a low concentration and reducing CO poisoning of the Pt electrode. Pt is modified by a polyaniline porous film to improve the electrocatalytic activity towards formate oxidation. The result indicates that formate can bypass the poisoning path to form CO2 at a low potential. Additionally, we propose a new mechanism of formate electrooxidation and investigate the possibility of an independent oxidation path starting from free formate in solution.
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Yang et al. (2017) studied this question.
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