title: Highly Active NaTaO3-Based Photocatalysts for CO2Reduction to Form CO Using Water as the Electron Donor.
abstract: Doped NaTaO3(NaTaO3:A, where A=Mg, Ca, Sr, Ba, or La) has arisen as a highly active photocatalyst for CO2reduction to simultaneously form CO, H2, and O2using water as the electron donor when used with an Ag cocatalyst, under UV irradiation, and with 1 atm (0.1 MPa) of CO2. The ratio of the number of reacted electrons/holes was almost unity, indicating that water was consumed as the electron donor. A liquid-phase reduction method for loading of the Ag cocatalyst was superior to photodeposition and impregnation methods. The Ag cocatalyst-loaded NaTaO3:Ba was the most active photocatalyst in water with no required additives. The addition of bases, such as hydrogencarbonate, was effective to enhance the CO formation for Mg-, Ca-, Sr-, Ba-, and La-doped NaTaO3photocatalysts with an Ag cocatalyst. Ca- and Sr-doped NaTaO3photocatalysts showed especially high activity along with the Ba-doped photocatalyst in the aqueous NaHCO3solution. The selectivity for the CO formation [CO/(CO+H2)] on Ca-, Sr-, and Ba-doped NaTaO3photocatalysts with Ag cocatalyst reached around 90 %.
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Haruka
authors.initials: H
authors.lastname: Nakanishi
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Kosuke
authors.initials: K
authors.lastname: Iizuka
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Takayama
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.|Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan.
authors.forename: Akihide
authors.initials: A
authors.lastname: Iwase
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan.|Photocatalysis International Research Center, Research Institute for Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan.
authors.forename: Akihiko
authors.initials: A
authors.lastname: Kudo
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D004579:Electron Transport; D006863:Hydrogen-Ion Concentration; D010087:Oxides / Q000737:chemistry*; D055668:Photochemical Processes; D012834:Silver / Q000737:chemistry; D013635:Tantalum / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D010087:Oxides; D014867:Water; C404416:sodium tantalate; D002245:Carbon Dioxide; D012834:Silver; D013635:Tantalum; D002248:Carbon Monoxide
keywords: alkali earth metals; carbon dioxide fixation; electron donor; energy conversion; photocatalysis