Effect of heat treatment on the performance of TiO2-Pt/CNT catalysts for methanol electro-oxidation |
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| Authors: | Huanqiao Song Xinping Qiu Fushen Li |
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| Affiliation: | a Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China
b School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | TiO2-Pt/CNT catalysts before and after heat treatment were prepared. Their catalytic activities for methanol and CO electro-oxidation were studied in detail. The results showed that the proper amount of hydrous TiO2 in TiO2-Pt/CNTs (e.g. heated at 200 °C for 2 h) was favorable for enhancing the catalytic activity of Pt/CNTs, which provided evidence for bi-functional mechanism. The studies on the catalysts with different TiO2/Pt molar ratio displayed that the optimum molar ratio varied with the increase of heat treatment temperature. It was found that the optimum molar ratio of TiO2/Pt was at 1:2 for the catalysts without heat treatment and was at 1:1 for the catalysts by heat treatment at 500 °C. This fact was ascribed to the difference in compact degree between TiO2 and Pt/CNTs before and after heat treatment. Considering the influence of heating temperature, it was found that TiO2-Pt/CNT catalyst heated at 200 °C for 2 h had better catalytic activity for methanol oxidation. |
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| Keywords: | Methanol oxidation Electro-catalysts Heat treatment CO stripping Direct methanol fuel cell |
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