Kentaro Teramura,1,2* Kazutaka Hori,1 Yosuke Terao,1 Hiroyuki Tatsumi,1 Zeai Huang,1 Shoji Iguchi,1 Zheng Wang,1 Hiroyuki Asakura,1,2 Saburo Hosokawa,1,2 Tsunehiro Tanaka1,2
1Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615–8510, Japan
2Elements Strategy Initiative for Catalysts & Batteries (ESICB), Kyoto University, Kyotodaigaku Katsura, Nishikyo-ku, Kyoto 615–8520, Japan
Nano-Micro Conference, 2017, 1, 01048
Published Online: 27 October 2017 (Abstract)
The reduction in human-induced emissions of CO2 from automobiles, factories, power stations etc., over the next 15 years is currently one of the most important issues facing the planet. We should therefore attempt to develop industrial processes using CO2 as a feedstock in order to build a sustainable society in the near future. Linear CO2 molecules adsorbed on the surface of the solid bases are converted into unique structures, such as bicarbonate and carbonate species possessing lattice oxygen atoms. We believe that the process involves the capture and distortion of CO2 upon adsorption on a solid base through activation by photoirradiation. Unstable CO2 species adsorbed onto the surface can then be reduced by electrons with protons derived from H2O (CO2 + 2e− + 2H+ → CO + H2O). These days, we succeeded in designing highly selective photocatalytic conversion of CO2 by H2O as the electron donor, by the simultaneous use of an inhibitor of the production of H2 and a material for CO2 capture and storage, such as ZnGa2O4/Ga2O3 [1,2], La2Ti2O7 , SrO/Ta2O5 , ZnGa2O4  and ZnTa2O6 , and Sr2KTa5O15  with the modification of Ag cocatalyst. An isotope experiment using 13CO2 and mass spectrometry clarified that the carbon source of the evolved CO is not the residual carbon species on the photocatalyst surface, but the CO2 introduced in the gas phase. In addition, stoichiometric amounts of O2 evolved were generated together with CO.
 Kentaro Teramura; Zheng Wang; Saburo Hosokawa; Yoshihisa Sakata; Tsunehiro Tanaka , A Doping Technique that Suppresses Undesirable H2 Evolution Derived from Overall Water Splitting in the Highly Selective Photocatalytic Conversion of CO2 in and by Water. Chemistry - A European Journal. 20, 9906-9909 (2014). doi:10.1002/chem.201402242
 Zheng Wang; Kentaro Teramura; Zeai Huang; Saburo Hosokawa; Yoshihisa Sakata; Tsunehiro Tanaka, Tuning the selectivity toward CO evolution in the photocatalytic conversion of CO2 with H2O through the modification of Ag-loaded Ga2O3 with a ZnGa2O4 layer. Catalysis Science & Technology. 6, 1025-1032 (2016). doi:10.1039/C5CY01280E
 Zheng Wang; Kentaro Teramura; Saburo Hosokawa; Tsunehiro Tanaka, Photocatalytic conversion of CO2 in water over Ag-modified La2Ti2O7. Applied Catalysis B: Environmental. 163, 241-247 (2015). doi:10.1016/j.apcatb.2014.07.052
 Teramura Kentaro; Tatsumi Hiroyuki; Wang Zheng; Hosokawa Saburo; Tanaka Tsunehiro, Photocatalytic Conversion of CO2 by H2O over Ag-Loaded SrO-Modified Ta2O5. Bulletin of the Chemical Society of Japan. 88, 431-437 (2015). doi:10.1246/bcsj.20140385
 Zheng Wang; Kentaro Teramura; Saburo Hosokawa; Tsunehiro Tanaka, Highly efficient photocatalytic conversion of CO2 into solid CO using H2O as a reductant over Ag-modified ZnGa2O4. Journal of Materials Chemistry A. 3, 11313-11319 (2015). doi:10.1039/C5TA01697E
 Shoji Iguchi; Kentaro Teramura; Saburo Hosokawa and Tsunehiro Tanaka, A ZnTa2O6 photocatalyst synthesized via solid state reaction for conversion of CO2 into CO in water. Catalysis Science & Technology. 6, 4978-4985 (2016). doi:10.1039/C6CY00271D
 Zeai Huang; Kentaro Teramura; Saburo Hosokawa; Tsunehiro Tanaka, Fabrication of well-shaped Sr2KTa5O15 nanorods with a tetragonal tungsten bronze structure by a flux method for artificial photosynthesis. Applied Catalysis B: Environmental. 199, 272-281 (2016). doi:10.1016/j.apcatb.2016.06.039
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