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Hydrogen is an ideal energy carrier with high energy density and hydrogen combustion will not pollute the environment.It is an important way to solve the human energy problem by using solar energy photocatalytic decomposition of hydrogen to produce hydrogen.Due to its suitable band position and band Gap width, widely used as a visible light photocatalytic decomposition of water materials due to rapid photogenerated carrier recombination and light corrosion problems, CdS in the photocatalytic hydrogen production process requires the addition of electronic sacrificial agents, such as methanol, lactic acid, triethanolamine, etc. On the one hand, these electronic sacrificial agents can dissipate photogenerated holes to solve the problem of photodegradation of CdS, and on the other hand, it can suppress the recombination of photogenerated electrons and holes and increase the lifetime of photogenerated electrons. However, It is not a complete 'solar-chemical conversion reaction.' Hydrogen is produced at the chemical energy expense of electron sacrificial agents and therefore can only be called 'semi-solar-chemical energy conversion reaction.'
Recently, the Institute of Physics and Chemistry, Chinese Academy of Sciences Institute of Photochemical Conversion and Synthesis of metal organic photochemical research group made visible light catalytic decomposition of pure water research has made new progress in the synthesis of the first team of traditional hydrothermal synthesis of CdS improved by Adding a proper amount of reductant hydrazine hydrate to reduce the hexagonal CdS slightly to obtain a CdS rich in sulfur vacancies; then performing phosphorus gap doping on the hexagonal CdS to prepare a strong n-type semiconductor to promote the position of the Fermi level and the sulfur vacancy level Close to this, the sulfur vacancies at this level will exhibit the ability of an electron trapping trap to temporarily store photogenerated electrons as a reservoir, thereby extending photogenerated electron lifetime and long lifetime photogenerated electrons with sufficient kinetic ability to migrate to CdS Surface, further proton reduction reaction.Related research results recently published in Advanced Materials.
The research work has been supported by the CAS Pilot Program for Science and Technology Pilot Project (Category B), the State Key Basic Research Program of the Ministry of Science and Technology, and the National Natural Science Foundation of China.
