A Pt-Bi bimetallic nanoparticle catalyst for direct electrooxidation of formic acid in fuel cells |
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Authors: | Shu-Hong Li Yue Zhao Jian Chu Wen-Wei Li Han-Qing Yu Gang Liu Yang-Chao Tian |
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Institution: | 1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China; 2. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | Direct formic acid fuel cells are a promising portable power-generating device, and the development of efficient anodic catalysts is essential for such a fuel cell. In this work Pt-Bi nanoparticles supported on micro-fabricated gold wire array substrate were synthesized using an electrochemical deposition method for formic acid oxidation in fuel cells. The surface morphology and element components of the Pt-Bi/Au nanoparticles were characterized, and the catalytic activities of the three Pt-Bi/Au nanoparticle electrodes with different Pt/Bi ratios for formic acid oxidation were evaluated. It was found that Pt4Bi96/Au had a much higher catalytic activity than Pt11Bi89/Au and Pt13Bi87/Au, and Pt4Bi96/Au exhibited a current density of 2.7 mA·cm-2, which was 27-times greater than that of Pt/Au. The electro-catalytic activity of the Pt-Bi/Au electrode for formic acid oxidation increased with the increasing Bi content, suggesting that it would be possible to achieve an efficient formic acid oxidation on the low Pt-loading. Therefore, the Pt-Bi/Au electrode offers a promising catalyst with a high activity for direct oxidation of formic acid in fuel cells. |
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Keywords: | catalyst electrochemical deposition formic acid oxidation fuel cell gold wire array microfabrication |
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