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Títol:
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Amorphous carbon modified nano-sized tungsten carbide as a gas diffusion electrode catalyst for the oxygen reduction reaction
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Autor/a:
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Liu, Zhiwei; Li, Ping; Zhai, Fuqiang; Wan, Qi; Volinsky, Alex A.; Qu, Xuanhui
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Altres autors:
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Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials |
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Abstract:
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Nanostructured tungsten carbide with high surface area and containing amorphous carbon is prepared by a
low temperature combustion synthesis method. The nanostructured tungsten carbide is used as the
catalyst in a gas diffusion electrode. The obtained WC with different carbon content was investigated by
XRD, FESEM, TG-DTA, BET and XPS. When the molar ratio of C/W is 19/3, the WC particles with different
carbon content are obtained after a carbonizing process between 900 and 1400 C, and the content of
free carbon in WC also increases gradually with temperature. The carbon content is tested by the high
frequency combustion-infrared absorption method in a carbon sulfur analyzer. The electrochemical
properties of the tungsten carbide for the oxygen reduction reaction are characterized by its polarization
curves and electrochemical impedance. The results show that the presence of the appropriate
amorphous carbon is beneficial for improving the conductivity and dispersibility of the tungsten carbide
catalyst, and more active centers can be provided by the catalyst |
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Matèries:
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-Àrees temàtiques de la UPC::Física
-Fuel cells
-Oxidation
-Hydrogen
-Electrolytic reduction
-Stability
-METHANOL ELECTROOXIDATION
-FUEL-CELLS
-OXIDATION
-PLATINUM
-ELECTROCATALYST
-HYDROGEN
-ELECTROREDUCTION
-REPLACEMENT
-STABILITY
-Combustibles
-Oxidació
-Hidrògen com a combustible |
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Drets:
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Tipus de document:
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Article - Versió publicada
Article |
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