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A schematic diagram of the importance of the crystal plane in the design of a composite catalyst for photolysis of water and hydrogen
Recently, Prof. Xiong Yujie of the University of Science and Technology of China teamed up with Prof. Jiang Jun and Associate Prof. Zhang Qun of the Luo Yi Research Team to cooperate in the “three-position integration†of material design and synthesis, theoretical simulation, and advanced characterization. New progress was made.
Researchers for the first time realized the synergy between the intrinsic charge charge distribution of semiconductors and the Schottky barrier-driven charge transfer between semiconductors and metals by designing semiconductor surface crystal planes in semiconductor-metal composite structures, thereby achieving significantly improved performance. Photolysis of water to make hydrogen catalysts. The results were published in the German Journal of Applied Chemistry. The co-first authors of the paper were doctoral students Wang Lili and Ge Jing.
For a long time, the industry has been using the Schottky barrier between semiconductors and metals to improve semiconductor photogenerated electron-hole pair separation and photocatalytic quantum efficiency; in the design of composite structure catalysts, the surface work function of the semiconductor is to determine the potential barrier energy. One of the important parameters formed.
For the Schottky junction design of semiconductor-metal composite structures, the research team first conducted photodeposition experiments and theoretical simulations, revealing that there are great differences in the surface work functions of different crystal planes of semiconductors, resulting in light-excited semiconductor electrons and vacancies. Holes migrate to different surface planes, resulting in space-dependent charge distribution and separation.
Based on this finding, the researchers managed the interaction between the charge transfer at the Schottky junction interface and the intrinsic space charge distribution in the semiconductor by adjusting the semiconductor planes in the composite structure, and further characterized by ultrafast spectroscopy and kinetics. Photocurrent measurements have revealed that this design can improve electron-hole separation efficiency by several dozen times, and the designed composite structure exhibits significantly improved activity in photocatalysis. This breakthrough in research will help deepen people's understanding of the behavior of charge in composite structural materials and will also play an important role in the design of photocatalytic water-based hydrogen production catalysts.
The above research was funded by the Ministry of Science and Technology's "973" program, the National Natural Science Foundation of China, the National Youth 1000 Program, the Chinese Academy of Sciences 100-person plan, the Chinese Academy of Sciences pilot project, and China University of Science and Technology major project development fund.
Many people like to grow some green plants or vegetables at home, but after all, our indoor space cannot be compared with nature, so the growth state of plants at home is not very good, and sometimes even the most basic photosynthesis cannot be guaranteed. The emergence of soilless cultivation and low-energy LED lighting has helped people to easily grow vegetables anywhere and at any time, and the cultivated vegetables are pollution-free, safe and healthy. The prospects of miniature plant growth systems and plant growth lamps are therefore also widely optimistic.
Lume Plant Cultivator
The Lume, designed by designers Christopher Ktting and Lukas Uhlitz, is a bit like a plant grower. From the outside, it looks a bit like a lamp, with a wood design at the bottom and a glass cover on top.
It has built-in sensors that can analyze water, light and soil conditions. When the light is insufficient, its built-in LED light source will automatically emit light, which can produce photosynthesis. It comes with a matching App, which can analyze the moisture and soil conditions of green plants at any time, and respond to users in time.
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