| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
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| Outline of Final Research Achievements |
The formation rate of CO is normally lower than that of H2 for the photocatalytic conversion of CO2 by H2O as an electron donor because the redox potential of CO2 to CO is more negative than the H+/H2 redox potential. Thus, the reduction of CO2 competes with the production of H2 from H2O (overall water splitting) even in the presence of CO2. In this study, we found that the modification of various photocatalysts with alkaline-earth and rare-earth metal oxides enhanced the formation rate of CO and selectivity toward CO evolution for the photocatalytic conversion of CO2 by H2O. The several characterization techniques revealed that the bicarbonate species (HCO3-) adsorbed on the active alkaline-earth and rare-earth metal sites was reduced to CO via the formate species during photoirradiation.
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