Abstract
The electro-oxidation of methanol at supported tungsten carbide (WC) nanoparticles in sulfuric acid solution was studied using cyclic voltammetry, potentiostatic measurements, and differential electrochemical mass spectroscopy (DEMS). The catalyst was prepared by a sonochemical method and characterized by X-ray diffraction. Over the WC catalyst, the oxidation of methanol (1 M in a sulfuric acid electrolyte) begins at a potential below 0.5 V/RHE during the anodic sweep. During potentiostatic measurements, a maximum current of 0.8 mA mg−1 was obtained at 0.4 V. Measurements of DEMS showed that the methanol oxidation reaction over tungsten carbide produces CO2 (m/z = 44); no methylformate (m/z = 60) was detected. These results are discussed in the context of the continued search for alternative materials for the anode catalyst of direct methanol fuel cells.
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Acknowledgments
The authors thank Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support. L. J. Deiner thanks FAPESP for a postdoctoral fellowship (Fellowship Process # 04/03051-6). Furthermore, the authors thank Demetrius Profeti for helpful discussions and assistance with the DEMS experiments.
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Angelucci, C.A., Deiner, L.J. & Nart, F.C. On-line mass spectrometry of the electro-oxidation of methanol in acidic media on tungsten carbide. J Solid State Electrochem 12, 1599–1603 (2008). https://doi.org/10.1007/s10008-007-0495-x
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DOI: https://doi.org/10.1007/s10008-007-0495-x