title: Development of optically transparent water oxidation catalysts using manganese pyrophosphate compounds.
abstract: One challenge in artificial photosynthetic systems is the development of active oxygen evolution catalysts composed of abundant elements. The oxygen evolution activities of manganese pyrophosphate compounds were examined in electrochemical and photochemical experiments. Electrocatalysis using calcium-manganese pyrophosphate exhibited good catalytic ability under neutral pH and an oxygen evolution reaction was driven with a small overpotential (η<100 mV). UV-vis diffuse reflectance measurements revealed that manganese pyrophosphates exhibit weak absorption in the visible light region while commonly used oxygen evolution catalysts exhibit intense absorption. Therefore, the efficient light absorption of a photocatalyst was retained even after surface modification with a manganese pyrophosphate, and photochemical oxygen evolution was achieved by using magnesium ferrite modified with manganese pyrophosphate nanoparticles under the illumination of visible light at wavelength of over 420 nm.
authors: Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan.
authors: Toshihiro
authors: T
authors: Takashima
authors: Special Educational Program on Clean Energy, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan.
authors: Yuki
authors: Y
authors: Hotori
authors: Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan; Japan Science and Technology Agency, CREST, 5 Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan. Electronic address: hirie@yamanashi.ac.jp.
authors: Hiroshi
authors: H
authors: Irie
mesh_terms: D002384:Catalysis; D011756:Diphosphates / Q000737:chemistry* / Q000378:metabolism; D017895:Manganese Compounds / Q000737:chemistry* / Q000378:metabolism; D010084:Oxidation-Reduction; D010775:Photic Stimulation / Q000379:methods*; D055668:Photochemical Processes; D014867:Water / Q000737:chemistry* / Q000378:metabolism
chemical_list: D011756:Diphosphates; D017895:Manganese Compounds; D014867:Water