Photoassisted hydrogen production from a methanol-water mixture on platinized Cr2O3-DOPED TiO2 |
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| Affiliation: | 1. Center of Precision Medicine and Healthcare, Tsinghua-Berkeley Shenzhen Institute, Shenzhen, Guangdong Province, 518055, China;2. Institute of Biopharmaceutical and Health Engineering, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China;3. School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai, Shandong 264209, China;4. University of Science and Technology Hospital, Shenzhen, Guangdong Province, China;5. Chongqing Institute of Green and Intelligent Technology Chinese Academy of Sciences, Chongqing City, China;1. Nanoscience Graduate Program, Franciscan University - UFN, Santa Maria, RS, Brazil;2. Chemical Engineering Course, Franciscan University - UFN, Santa Maria, RS, Brazil;3. Polytechnical School of Chemical Engineering, University of the Sao Paulo - USP, São Paulo, SP, Brazil;4. Department of Fundamental Chemistry (DQF), Academic Center of Vitória (CAV), Federal University of Pernambuco - UFPE, Recife, PE, Brazil;1. College of Materials Science and Engineering, Guangxi University, PR China;2. Max-Planck-Institut für Eisenforschung GmbH, Postfach 140444, D-40074 Düsseldorf, Germany |
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| Abstract: | In situ reduction of previously adsorbed Pt4+ species on TiO2 (anatase) was employed to obtain highly active catalysts for hydrogen photoevolution from a methanol-water solution. A quantum yield as high as 22% was observed. Optimum platinum coverage and the most favourable reaction conditions were established. The influence of surface Cr2O3 admixtures on photoactivity of TiO2 was investigated. It was found that although the dopant shifts the anatase spectrum into the visible, it was not possible to obtain hydrogen with light of energy smaller than the bandgap of TiO2. However, a small amount of Cr2O3 on the TiO2 surface acts as a poor catalyst for hydrogen evolution. |
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