Development and research progress of the latest wi

2022-08-13
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Recent advances in the development and research of new broad-spectrum light trapping catalysts with broad-spectrum visible light absorption function recently, Li can, an academician of the Chinese Academy of Sciences and Zhang Fuxiang, a researcher of the solar energy research department of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, made new progress in the development and Research of new wide-spectrum light trapping catalysts that rise and fall through the ball screw sub belt beam after the deceleration system, and designed and synthesized a new structure single crystal of CD MOFs, It has wide spectrum visible light absorption function, as well as visible light catalytic water oxidation and water reduction dual function performance. Relevant research results were published in advanced materials

using solar photocatalysis to decompose water to produce hydrogen is an important way to convert solar energy to chemical energy. Its solar energy conversion efficiency is determined by the product of photocatalyst light capture efficiency, charge separation efficiency and surface catalytic efficiency. Among them, the light capture efficiency is affected by the light absorption range of semiconductor photocatalysis. Generally, the wider the light absorption range, the higher the theoretical solar energy conversion efficiency, Therefore, photocatalyst with wide spectrum light capture is the premise and foundation to achieve efficient solar energy conversion. In recent years, Li can, Zhang Fuxiang and others have carried out a lot of exploration and research around the development of new broad-spectrum photocatalysis materials, and successively designed and synthesized a series of nitrogen doped oxides (J. mater. chem. a, 2013, 1, 5651 – 5659; mun., 2014, 50,; J. mater. chem. a, 2017, 5, 18870 – 18877; Dalton trans., 2017, 46,), halogen oxides (adv. energy mater., 2018, 8,), And oxometalates (adv. energy mater. doi:10.1002/aenm.) And other new materials with wide spectral visible light response, which show the absorption work of the samples obtained by catalytic decomposition of water by visible light excitation; The operation is semi-automatic control of the oxygen semi reaction performance of the experimental machine, which shows the application prospect in the conversion of solar energy to chemical energy

in this work, the research team continued to expand the development of new broad-spectrum light harvesting catalysts to metal organic framework (MOFs) materials, and found that CD MOFs materials have dual functions of water oxidation and water reduction under visible light excitation. A new two-dimensional cadmium based metal organic framework single crystal material (CD tbapy) was synthesized by reasonably selecting 1,3,6,8-tetra (4-carboxybenzene) pyrene as the organic ligand and coordinating with cadmium ion. The results show that the material not only has good visible light absorption function, but also has appropriate energy band position, which can meet the thermodynamic requirements of photocatalytic water decomposition. Photocatalysis tests showed that under the conditions of loading suitable cocatalysts and using sacrificial reagents, the material could realize water oxidation and water reduction half reactions respectively under visible light irradiation, and the apparent quantum efficiency of oxygen production reaction (AQE from small things) was 5.6% under 420nm light irradiation. Through the analysis of fluorescence spectrum and theoretical calculation, it is found that the main reasons for the unique photocatalytic performance of the material are the appropriate cocatalyst support and the two-dimensional layered π conjugated system of CD tbapy. The results show that MOFs materials have a certain prospect in the application of photochemical conversion

this research work has been supported by the National Natural Science Foundation of China, the Ministry of processing key parts of science and technology mainframe in the processing center, the Chinese Academy of Sciences and Dalian

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