2023 Fiscal Year Final Research Report
Characterization of Ag-modified photocatalysts and investigation of their mechansims for photocatalytic conversion of CO2 by H2O
| Project/Area Number |
21H01716
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 27030:Catalyst and resource chemical process-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | Agナノ粒子 / 光触媒 / CO2光還元 / 光電析法 |
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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 focused on Ag nanoparticle co-catalysts, which are essential for CO2 photoreduction, and modified them on the surface of photocatalysts by various methods such as impregnation, photodeposition, and chemical reduction methods, and compared their activity for the photocatalytic conversion of CO2 by H2O as an electron donor. Ag nanoparticles were mainly dispersed on the reduction surface of the photocatalyst and functioned as a CO2 reduction site.
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| Free Research Field |
触媒化学
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| Academic Significance and Societal Importance of the Research Achievements |
今後，人類が持続可能な社会を構築するためには，太陽光などの再生可能エネルギーを利用して，人類に必要な資源やエネルギーを作り出していく必要がある．本研究で対象にした「H2Oを電子源とするCO2光還元」は植物が行っている光合成を模倣しており，CO2とH2Oから化学物質を得られる人工光合成技術として注目を浴びている．この化学反応はH2Oの光還元による水素生成と競争するためにその制御が求められている．本研究では新規光触媒の開発とAgナノ粒子助触媒機能の解明によってCO生成速度を向上させることに成功した．
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