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Effects of the crystalline structure of Ga2O3 on the photocatalytic activity for CO production from CO2 |
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| Authors: | Yu Kawaguchi Muneaki Yamamoto Akiyo Ozawa Yuma Kato Tomoko Yoshida |
| Affiliation: | 1. Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan;2. Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Japan;3. Advanced Research Institute for National Science and Technology, Osaka City University, Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan |
| Abstract: | Ga2O3 samples with different crystalline structures were prepared by calcination of a gallium nitrate powder around 800 K. Ga2O3 samples with mixed phases of γ and β showed high photocatalytic activity for CO production from CO2 reduction with water, and the activity was even higher than that for an Ag-loaded β-Ga2O3. The photocatalytic activity increased with time. The increase was attributed to the appearance of GaOOH resulting from the interaction of Ga2O3 with water during the reaction as revealed by XRD and XPS analyses. In situ FT-IR measurements revealed that bicarbonates and bidentate carbonate species were adsorbed on GaOOH. Therefore, the increase of the photocatalytic activity with time would be derived from the formation of GaOOH phase on the γ-Ga2O3 and β-Ga2O3 sample. |
| Keywords: | Ga2O3 photocatalyst CO production from CO2 Ga2O3 crystalline structure |