Tungsten carbide as supports for Pt electrocatalysts with improved CO tolerance in methanol oxidation |
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Authors: | Guofeng CuiPei Kang Shen Hui Meng Jie ZhaoGang Wu |
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Affiliation: | a Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China b State Key Laboratory of Optoelectronic Materials and Technologies, and Key Laboratory of Low-carbon Chemistry & Energy Conservation of Guangdong Province, School of Physics and Engineering, Sun Yat-sen University, Guangzhou 510275, China c School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, China d Materials Physics & Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA |
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Abstract: | One anti-CO-poisoning Pt-WC/C catalyst for methanol electro-oxidation is prepared in this work, through depositing platinum on tungsten carbide support using an intermittent microwave heating (IMH) method. The catalyst presents an improved methanol oxidation performance evidenced by a negative shift in onset potential, and increase of peak current density, compared with a commercial Pt/C one. CO stripping experiments indicate that the adsorbed CO is able to be oxidized and removed from the Pt-WC/C catalyst more easily, attesting the enhanced capability of anti-poisoning to CO-like species. Theoretical calculation further provides evidence that the surface electronic structure in Pt-WC/C and Pt/C catalysts is likely different. WC supports could lead to much stronger negative electronic property, which is beneficial for avoiding CO adsorption on the Pt-WC/C catalyst. In the mean time, the electron donating effect generated by WC supports also promotes the ability to oxidize the adsorbed CO-like species on catalysts. In good agreement with experimental results, the theoretical calculation proves the anti-CO-poisoning nature of the Pt-WC/C catalyst, and well explains the origin of the improvement in the electrochemical catalytic performance for effectively accelerating the oxidation of CO to CO2 in methanol oxidation. |
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Keywords: | Tungsten carbide Theoretical calculation CO poisoning Methanol oxidation Fuel cells |
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