京都大学 · Energy
켄타로 테라무라 교수의 연구실은 광촉매를 활용한 이산화탄소 포집 및 환원을 핵심으로 하며, 특히 수분을 전자 공여체로 사용하는 고도로 선택적인 CO₂ 환원 반응에 초점을 맞추고 있습니다. 다양한 산화물 기반 광촉매(예: LDH, MgO, Ga₂O₃, ZnGa₂O₄, 질화갈막산화물 등)와 금속 촉매(은, 루테니움 등)의 조합을 통해 CO, 포름산, 메탄올 등 친환경 에너지원으로서의 유용한 탄소 화합물을 효율적으로 생성하는 기반 기술을 개발하고 있습니다. 특히, 반응 메커니즘 규명을 위해 EPR, 광발광, 질량 분석 등 정밀 분석 기법을 적극 활용하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Have a bit of bubbly: Significant amounts of CO and O2 gas are evolved in the photocatalytic conversion of CO2 over layered double hydroxides (LDHs) in water (see scheme). A simple mixture of the same metal hydroxides, which has the same constituent elements of the LDH, shows low activity for CO and O2 evolution. Dissolved CO2 gas was shown to be the source of carbon in the reaction over LDHs in water.
MgO exhibits activity for the reduction of CO2 to CO under photoirradiation in the presence of H2 or CH4 as a reductant, although MgO is an insulating material. The present study clarified the mechanism of the CO2 photocatalytic reduction in the presence of H2 or CH4 over MgO. The electron paramagnetic resonance (EPR) spectra show that a CO2 molecule adsorbed on MgO was activated to a CO2- radical under photoirradiation. In addition, it was confirmed by photoluminescence that new acceptor level
Photocatalytic conversion of CO2 to reduction products, such as CO, HCOOH, HCHO, CH3OH, and CH4, is one of the most attractive propositions for producing green energy by artificial photosynthesis. Herein, we found that Ga2O3 photocatalysts exhibit high conversion of CO2. Doping of Zn species into Ga2O3 suppresses the H2 evolution derived from overall water splitting and, consequently, Zn-doped, Ag-modified Ga2O3 exhibits higher selectivity toward CO evolution than bare, Ag-modified Ga2O3. We obs
Highly crystalline ZnGa<sub>2</sub>O<sub>4</sub> modified with Ag particles photocatalytically and selectively converted CO<sub>2</sub> into CO (155.0 μmol h<sup>−1</sup>) using H<sub>2</sub>O as an electron donor.
The formation and structural characteristics of Ru species applied as a cocatalyst on (Ga(1)(-)(x)()Zn(x)())(N(1)(-)(x)()O(x)()) are examined by scanning electron microscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy. RuO(2) is an effective cocatalyst that enhances the activity of (Ga(1)(-)(x)()Zn(x)())(N(1)(-)(x)()O(x)()) for overall water splitting under visible-light irradiation. The highest photocatalytic activity is obtained for a sample loaded with 5.0 wt % RuO(2)
Modification of Ag-loaded Ga<sub>2</sub>O<sub>3</sub> with a ZnGa<sub>2</sub>O<sub>4</sub> layer is effective for the highly selective photocatalytic conversion of CO<sub>2</sub> by H<sub>2</sub>O.
Al-doped strontium titanite (Al–SrTiO3) containing numerous stepwise edges on the surface was found to exhibit an excellent performance in the photocatalytic conversion of CO2 by H2O as an electron donor under photoirradiation at >300 nm with Ag modification, while in contrast, the Ag-loaded pristine SrTiO3 was inactive as a photocatalyst for this reaction. CO was stably evolved as the main reduction product at a rate of 7.2 μmol h–1 over the Ag-loaded Al–SrTiO3, and a small amount of H2 was gen
Loading Ag and Co dual cocatalysts on Al-doped SrTiO<sub>3</sub> (AgCo/Al-SrTiO<sub>3</sub>) led to a significantly improved CO-formation rate and extremely high selectivity toward CO evolution (99.8%) using H<sub>2</sub>O as an electron donor when irradiated with light at wavelengths above 300 nm. Furthermore, the CO-formation rate over AgCo/Al-SrTiO<sub>3</sub> (52.7 μmol h<sup>-1</sup>) was a dozen times higher than that over Ag/Al-SrTiO<sub>3</sub> (4.7 μmol h<sup>-1</sup>). The apparent qua
