In today's organic chemical systems, the vast majority of 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 and high energy consumption of catalyst materials. At the same time, the performance of metal oxides in the oxygen molecule activation system is not satisfactory and it cannot effectively capture solar energy and transfer it to oxygen molecules. Prof. Xiong Yujie of the University of Science and Technology of China, based on the inorganic solid-precision preparation chemistry, adopts crystal defect engineering to design a class of tungsten oxide nanostructures with defect states that exhibit excellent aerobic coupling catalytic properties under broad-spectrum lighting conditions. It is expected to realize low-energy and low-cost organic chemical technologies. The results were published online on July 11th in the "Journal of American Chemistry", an important international chemical journal.
In general, the metal atoms of the metal oxide have a characteristic of coordinated saturation and cannot activate the oxygen molecules by chemical adsorption. The construction of oxygen vacancy defects overcomes this drawback and promotes the efficient transfer of photo-generated electrons from the oxide catalyst to oxygen molecules. On the other hand, the appearance of defect states has greatly broadened the photocatalyst's light absorption range, allowing it to capture solar energy over a wide spectrum of visible and near-infrared light. This achieves effective capture of solar energy and transfer of energy transfer, and solves the bottleneck problem of oxide catalysts in photocatalytic organic synthesis.
"The results are the result of cross-disciplinary collaboration," said Xiong Yujie. His team, based on progress in catalyst design, collaborated with Professor Jiang Jun of the university and used theoretical simulation methods to clearly describe the oxygen vacancy defect state in the above two aspects. The contribution, in-depth understanding of its mechanism of action. The research team of Professor Song Li and Professor Zhu Junfa from the National Synchrotron Radiation Laboratory of the university used X-ray absorption fine structure spectroscopy and photoelectron spectroscopy to analyze the fine coordination and energy band structures of the photocatalysts in the defect state, confirming theoretical simulations. result. "It is based on this understanding that we have been able to regulate the conversion of solar energy to chemical energy through crystal defect engineering, provide possibilities for the use of solar energy instead of heat sources to drive organic synthesis, and play an important role in the rational design of photocatalytic materials." (Reporter Wu Changfeng correspondent Yang Baoguo)
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