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AssigneesMitsubishi Chemical Corporation, Shinshu University, Japan Technological Research Association of Artificial Photosynthetic Chemical Process
InventorsHiroaki YOSHIDA, Susumu TSUTSUMINAI, Nobuko KARIYA, Kazunari DOMEN, Takashi HISATOMI, Lihua LIN, Xiaoping TAO, Xizhuang LIANG
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Provided is a photocatalyst with significantly enhanced water splitting performance in YTOS or in a composition in which the yttrium element of YTOS has been replaced with another element. Also provided is a method for producing a photocatalyst that has a composition represented by the following general formula (I), the method including mixing, with a raw material of the photocatalyst, a flux component at a mass ratio of 0.01 times to 50 times, the flux component being composed of one or more chlorides and/or iodides of at least one selected from Li, Na, K, Rb, Mg, Ca, Sr, and Ba, and calcining a resultant product at 450° C. to 1050° C.: MaTibOcSd (I) (where M is a combination of one or more selected from Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Y, a is a number of 1.7 to 2.3, b is a number of 2, c is a number of 4.7 to 5.3, and d is a number of 1.7 to 2.3).
A method for producing a photocatalyst having a composition represented by the following general formula (I), comprising
A photocatalyst having a composition represented by the following general formula (I), wherein the photocatalyst generates hydrogen in an amount of 100 μmol or more per hour by irradiating the photocatalyst with light using a 300 W xenon lamp (λ>420 nm) in an aqueous methanol solution having a 10 volume % concentration or a 20 mmol/L Na2S—Na2SO3 aqueous buffer solution:
A photocatalyst having a composition represented by the following general formula (I), wherein a surface elemental composition ratio of S to Ti (S/Ti) as obtained by XPS measurement is in a range of 0.50 to 1.08:
Dependencies are inferred from the claim text.