On November 14, a reporter from the Science and Technology Daily learned from the Nanjing University of Science and Technology that Prof. Zhang Wei of the College of Materials Science and Technology of the University has synthesized a cadmium sulfide and molybdenum sulfide heterostructure photocatalyst through defect-induced epitaxial growth. It ensures the high efficiency of hydrogen production for artificial photosynthesis and greatly reduces the cost. The results of this research have advanced the pace of efficient and clean industrial production of hydrogen energy.
In the artificial photosynthesis process, the cocatalyst plays a crucial role in the conversion efficiency. In the past, it mainly relied on rare metals such as platinum, gold, rhodium, and ruthenium as cocatalysts. Although the efficiency was high, it was expensive and could not meet the needs of industrial production. It was subsequently found that cheap molybdenum sulfide has similar hydrogen evolution catalytic activity as metal platinum. Therefore, how to improve the catalytic conversion efficiency of molybdenum disulfide is the key to promote this artificial platinum-free photosynthesis.
Zhang Jian and the international cooperation team established defects on the surface of molybdenum sulfide nanorods to control the synthesis conditions, and finally achieved epitaxial growth of cadmium sulfide, molybdenum sulfide, and other heterogeneous photocatalysts. For the first time in the world, this coaxial epitaxially grown heterostructure was obtained. This heterogeneous photocatalyst reduces the energy loss of charge transfer between interfaces, and the quantum efficiency at 420 nm approaches 80%. (Correspondence reporter Zhang Jian)
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