Do magnetically modified PtFe/C catalysts perform better in methanol electrooxidation? |
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Authors: | Jianhuang Zeng Zeliang Zhao Pei Kang Shen |
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Affiliation: | a State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, 135 Xingang Road, Guangzhou, Guangdong 510275, China b Heraeus Pte Ltd., Angmokio Street 65, Singapore 569059, Singapore c Department of Chemical & Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore |
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Abstract: | Motivated by the demonstrated magnetic field effect on the oxygen reduction reaction in polymer electrolyte fuel cells (PEMFC), a number of PtFe/C catalysts with different magnetic characteristics were prepared and tested for methanol electrooxidation in acidic solutions at room temperature. The catalysts were characterized by transmission electron microscopy (TEM), powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energy dispersive X-ray microanalysis (EDX) and vibrating sample magnetometry (VSM). The activity and CO tolerance of the catalysts in the methanol oxidation reaction (MOR) was measured by cyclic voltammetry and anodic CO stripping voltammetry, respectively. Heat treatment transformed the as-prepared PtFe/C from a face-centered cubic (fcc) structure into a face-centered tetragonal (fct) structure. Vibrating sample magnetometer (VSM) measurements confirmed the as-prepared PtFe/C as superparamagnetic, and the heat-treated catalysts as ferromagnetic. The heat-treated ferromagnetic catalysts were, however, low in specific mass activity and showed no improvement in CO tolerance relative to the as-prepared one. These results led us to conclude that the magnetic modification of catalysts through heat treatment have no practical contributions to the catalysis of MOR. |
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Keywords: | Magnetically modified PtFe/C Heat treatment Methanol electrooxidation CO tolerance |
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