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Hydrogen is an ideal energy carrier with high energy density, and hydrogen combustion will not pollute the environment. The use of solar photocatalysis to decompose water into hydrogen is an important way to solve human energy problems. CdS is widely used as a visible light photocatalytic water splitting material because of its suitable band position and bandgap width. Due to the rapid photo-carrier recombination and photo-corrosion problems, CdS requires the addition of electronic sacrificial agents such as methanol, lactic acid, and triethanolamine during photocatalytic hydrogen production. On the one hand, these electronic sacrificial agents can consume photogenerated holes to solve the problem of CdS photo-corrosion; on the other hand, they can suppress the recombination of photo-generated electrons and holes and increase the lifetime of photo-generated electrons. However, the photocatalytic hydrogen production by adding sacrificial agents is not a complete "solar-chemical conversion reaction." Hydrogen production is at the expense of the chemical energy used to dissipate the electronic sacrificial agent. Therefore, it can only be called "semi-solar energy conversion." reaction".
Recently, the research group of metal organic photochemistry of photochemical conversion and synthesis research center of Institute of Physics and Chemistry, Chinese Academy of Sciences has made new progress in the study of visible light photocatalytic decomposition of pure water. The team first improved the traditional hydrothermal synthesis of CdS on the synthetic route. By adding an appropriate amount of reducing agent hydrazine hydrate to slightly reduce the six-party CdS, a CdS rich in sulfur vacancy defects was obtained; after that, phosphorus gap doping was performed. Miscellaneous, the preparation of strong n-type semiconductors, prompt Fermi level and sulfur vacancy level close to the sulfur vacancy level will show the ability to capture traps by electrons, like a reservoir of photoelectrons for temporary storage, Extending the photoelectron lifetime, long-lived photogenerated electrons have sufficient kinetic capability to migrate to the CdS surface and further proton reduction reactions occur. The related research results were recently published on Advanced Materials.
The research work was supported by the Chinese Academy of Sciences' strategic pilot technology project (Class B), the National Key Basic Research Program of the Ministry of Science and Technology, and the project supported by the National Natural Science Foundation of China.
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