A Study on Charge Separation Between Crystal Surfaces of High Symmetry Photocatalysts in Dalian Institute of Chemical Industry

Advances in research on charge separation between crystal planes of highly symmetrical photocatalysts at DAL.

Recently, Li Can team (Mu Linchao, Li Rengui, Li Can, etc.) of the State Key Laboratory of Catalysis and the National Laboratory of Clean Energy of the Dalian Institute of Chemical Physics of the Chinese Academy of Sciences made progress in the study of photocatalytic charge separation in solar energy photocatalysis. The results were published in the Energy and Environmental Science International Energy and Environmental Science Journal.

Photo-induced charge separation is one of the key scientific issues in solar photocatalysis research. The Dalian Institute of Chemicals Li Can has devoted a long time to the study of the scientific issues of photo-induced charge separation in solar photocatalytic conversion, and has successively proposed in the world the strategy of “heterojunction” and “intermolecular charge separation” to promote the separation of photogenerated charge (Nature Commun ., 2013, 4, 1432; Energy Environ. Sci., 2014, 7,1369; Eur. Chem. J, 2015, 21, 14337; J. Catal., 2016, 337, 36; ACS Catal., 2016, 6 , 2182). Previous studies have found that there are charge separation effects between the crystal planes of low-symmetry semiconductor-based photocatalysts, but for high-symmetry semiconductor crystals (such as cubic crystals), no photo-induced charge separation between crystal planes has been observed.

The team used the cubic phase SrTiO3 as a model to controllably synthesize a hexahedral SrTiO3 with a single crystal face and an 18-octahedron SrTiO3 with an unequal crystal face exposed. It was found that for hexahedral single crystals (exposing six equivalent crystal planes), the separation of photogenerated charges between the crystal planes cannot be achieved, and when the morphology is modulated to the octahedron, the photoelectrons and the holes are effectively separated into different crystals. On the surface, the spatial separation of photogenerated charge is realized. The oxidation and reduction cocatalysts are selectively grown on different crystal faces, not only to achieve separation of photogenerated charges between different crystal planes, but also to spatially separate the oxidation and reduction reactions, and to promote the photocatalytic decomposition of water to increase the hydrogen activity. More than 5 times. This work has developed the theory of photo-induced charge separation between crystal planes, which provides a new strategy for achieving efficient photocatalytic water decomposition.

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