It was learned from the University of Science and Technology of China that the researchers used the “Crystal Defect Project†to design a “defective nanostructureâ€, which is expected to revolutionize modernization.
The research results have recently been published online in the internationally important chemical journal "American Chemical Society".
In today's organic chemical systems, most of the catalytic reactions are based on the use of precious metal catalysts, and are driven by the combustion of petroleum and coal, and have the disadvantages of high cost of catalyst materials and high energy consumption. Metal oxides have the advantages of low cost and the like, and exhibit photocatalytic activity, and are an ideal catalytic material. However, the performance of metal oxides in oxygen molecular activation systems is not satisfactory and cannot effectively capture solar energy.
In response to this challenge, Xiong Yujie's group designed a tungsten oxide nanostructure with precise controllable oxygen vacancy defects.
According to reports, usually metal oxides cannot activate oxygen molecules by chemisorption. The construction of oxygen vacancy defects overcomes this disadvantage and promotes the efficient transfer of photogenerated electrons from the oxide catalyst to the oxygen molecules. In addition, the appearance of the defect state greatly broadens the light absorption range of the photocatalyst, so that it captures solar energy in a wide spectrum of visible light and near-infrared light regions. This achieves efficient capture and energy transfer of solar energy, and solves the bottleneck problem of oxide catalysts in photocatalytic organic synthesis.
Xiong Yujie introduced that the organic synthesis process driven by solar energy will be expected to replace the traditional thermal catalytic technology, thus achieving low-energy chemical production, providing new ideas for alleviating the current energy dilemma. The key to this "defective nanostructure" technology is how to reduce catalyst material costs and increase energy conversion efficiency.
Xiong Yujie said, "This study provides the possibility to use solar energy instead of heat to drive organic synthesis, and also plays an important role in the rational design of photocatalytic materials."
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