Development of non-precious metal photocatalytic hydrogen production materials
Professor Du Pingwu of the School of Chemistry and Materials Science, University of Science and Technology of China, China, designed and manufactured a non-precious metal photocatalytic hydrogen-producing material with high conversion rate, exhibiting superior hydrogen production performance and stability by artificial light synthesis. The research results were published in the form of a cover title on September 1st in the Energy and Environmental Sciences, a well-known international academic journal under the Royal Institute of Chemistry. Traditional oil and fossil energy consumption has caused global warming, environmental pollution, and energy shortages. It has become a major challenge for sustainable human development. By simulating photosynthesis, we have designed a highly efficient photocatalytic system to absorb light and decompose water into hydrogen. The conversion of solar energy to hydrogen energy is an ideal way to produce hydrogen. However, due to the large amount of precious metal catalysts used, the cost is high. At the same time, the spatial distribution between the light-absorbing material and the co-catalyst is not uniform, which may reduce the generation of light-induced excited state electrons, reduce the lifetime of the interface excited electrons, and greatly affect the efficiency of photocatalytic hydrogen production. The research group had previously found that transition metal phosphides as co-catalysts have good photocatalytic properties for hydrogen production. By loading phosphide such as cuprous phosphide and molybdenum phosphide on semiconductors, hydrogen production from photocatalytic hydrogen generation from semiconductors can be effectively enhanced. s efficiency. On this basis, the research group used the solvothermal method to subtly load a new nickel phosphide co-catalyst on the cadmium sulfide semiconductor nanowires, resulting in a uniformly distributed and tightly contacted phosphide nickel/cadmium sulfide composite structure. Efficient, stable, and inexpensive artificial photosynthesis catalyst. The experimental data and spectral characterization show that the composite structure can effectively promote the rapid electron transfer process in the composite material, inhibit the deactivation of the excited electrons, and improve the performance of visible light catalytic hydrogen production. In the case of adding sodium sulfide/sodium sulfite, the catalyst material achieves efficient photocatalytic hydrogen production: at a visible light greater than 420 nanometers, the hydrogen production rate per hour per milligram sample reaches 1200 micromolar, and the number of reaction conversions reaches approximately 3,270,000 in 90 hours, The number of reaction times per hour based on the nickel phosphide promoter reached 36,400. (Reporter Wu Changfeng correspondent Yang Baoguo) Silicon Barium Calcium Magnesium Alloy Silicon Barium Calcium Magnesium Alloy,Ferro Silicon Calcium,Calcium Silicon,Calcium Silicon Barium Product NINGXIA HELANSHAN METALLURGY CO., LTD. , https://www.nxhlsyjferrosilicon.com