Sichuan University has made important progress in the surface catalytic mechanism of hydrogen production from electrolyzed water
Recently, Wang Zegao, a specially appointed researcher of the School of Materials Science and Engineering of our school, has cooperated with Professor Mingdong Dong of Aarhus University in Denmark and Professor Xiao Cheng Zeng of the University of Nebraska-Lincoln in the United States to make important progress in the field of surface catalysis. The related research results "Reversing "Interfacial Catalysis of Ambipolar WSe2 Single Crystal" was published in the top journal Advanced Science (impact factor 15.804) with Sichuan University as the first unit.
Hydrogen energy is a green and environmentally friendly energy source, which has the advantages of high specific energy, high safety, and environmental friendliness. Electrolyzed water is considered a safe and controllable way of preparing hydrogen. The electrolysis of water can convert electrical energy into hydrogen energy for storage, so it is considered to be a form of electrical energy storage. However, the production of hydrogen by electrolyzed water needs to overcome the barrier of hydrogen atoms on the surface of the catalytic material, resulting in a lower efficiency of hydrogen production. In recent years, scholars from various countries have tried several controlled synthesis of electrolyzed water catalysts. However, because the catalytic reaction is affected by many factors, such as material composition and microstructure, the catalytic mechanism is extremely complicated.
Special researcher Wang Zegao published a paper in NPG Asia Materials, 2018, 10, 703-712, which systematically revealed the characteristics of bipolar electric transport modulated by tungsten diselenide field (controlled by external electric field, its carriers can be n Conversion between type and p-type); combined with scanning probe microscopy technology reveals the movement mechanism of the Fermi level of the material during n / p type conversion. On this basis, the team researchers used single crystal bipolar tungsten diselenide as a model catalyst, and built a field-modulated micro-cell based on tungsten diselenide through micro-nano processing. Through the external field to adjust the conductivity properties of tungsten diselenide materials (carrier concentration, carrier type, electrical conductivity), the evolution of tungsten diselenide catalytic activity during this process was studied. The study found that in the electrocatalytic hydrogen evolution reaction, the electron carriers in the material play an important role in catalyzing the hydrogen evolution reaction, while the tungsten diselenide with the same conductivity hole as the majority carrier has no catalytic hydrogen evolution. active. This experimental result is supported by theoretical calculations by the team of Professor Xiao Cheng Zeng of the University of Nebraska-Lincoln, and reveals the effect mechanism of carriers in the adsorption and diffusion of hydrogen atoms from the perspective of charge distribution. The research in this paper provides a new idea for further optimization of the design of high-efficiency catalysts.
Figure 1. Tungsten diselenide external field modulation micro-reaction cell and field modulation catalytic curve test
Wang Zegao is a distinguished researcher at the School of Materials Science and Engineering of our school. He is a recipient of the Double Hundred B Program and the Thousand Talents Program of Sichuan Province. His main research areas are electronic functional materials and electronic components. He has published SCI papers in Advanced Materials, Science Advances, PNAS and other journals. The rest, H-index 30.
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