Study of artificial photosynthesis using a manganese dioxide catalyst under visible light irradiation.

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The capability of water splitting of a catalyst made of manganese dioxide, was determined. The manganese dioxide catalyst splits water into proton, electron, and oxygen, like chloroplast of plants. This property of the catalyst is different from that of conventional photo-catalysts which split water into hydrogen and oxygen.The novel proton conductivity of a high-purity, ramsdellite-crystal type manganese dioxide was confirmed, and a hydrogen gas sensor that enabled in-situ measurements of hydrogen gas concentration over a wide range of 0. 1?99. 9% at room temperature, by using a electrolyte made of the ramsdellite-crystal type manganese dioxide, was developed.Synthesis methods of the high-purity, ramsdellite-crystal type manganese dioxide were developed.The moderate reduction ability of the ramsdellite-crystal type manganese dioxide to convert carbon dioxide into several organic acids in water, was discovered.