Professor Xiong Yujie of the University of Science and Technology of China has developed a class of cocatalysts with an atomic-accurate shell structure that can significantly reduce the amount of precious metal platinum promoters and at the same time greatly increase the performance of hydrogen production from photolysis of water to develop low-cost, high-performance light. Catalytic materials provide new ways. The results were recently published online in the important international chemical journal "German Applied Chemistry" and were selected as "very important papers" of the journal. Solar energy is considered the cleanest source of energy in the 21st century, and photolysis of water to make hydrogen is a way to directly convert solar radiation energy into hydrogen energy. The co-catalyst can promote the interaction of solar-generated charge with reactive water molecules. Precious metal platinum materials have long been proved to be an excellent photocatalytic water-producing hydrogen co-catalyst, but their cost is high. Xiong Yujie's team designed a class of palladium-platinum core-shell co-catalysts with atomic-accuracy shells based on the previously developed mechanism of electron-driven action. This design utilizes the potential difference between palladium and platinum metals as the "kinematic" driving force of photo-electrons in semiconductors. This causes electrons to "send" spontaneously from semiconductors to metallic palladium and platinum, and finally accumulate on the outer surface of metallic platinum shells. , which drives the efficient photolysis of water to produce hydrogen on the platinum surface. Prof. Jun Jiang, a collaborator, described the charge evolution process through theoretical simulations. Prof. Lu Junling’s group used carbon monoxide as a probe molecule to clearly reflect the selective aggregation effect of charge on the platinum metal surface in the infrared spectrum, thereby confirming This mechanism of action. The electronic driving mechanism proposes a high demand for the accuracy of metal platinum shells. Therefore, the researchers developed a synthetic method for the precise control of the shell thickness, so that a few atomic layers can be grown without the use of costly atomic layer deposition techniques. The thickness of the metal shell. According to Xiong Yujie, based on this technology, hydrogen production efficiency from photolysis of water is 322 times higher than that of semiconductor photocatalyst without helper catalyst and 8.2 times higher than that of conventional photocatalyst with pure platinum promoter. At the same time, the design replaces metal platinum with a relatively inexpensive palladium core, reducing material costs by more than one-third. (Reporter Wu Changfeng correspondent Yang Baoguo) Hollow Hydraulic Torque Wrench Hollow Hydraulic Torque Wrench,Hydraulic Torque Wrench,Hydraulic Wrench,Hydraulic Torque Multiplier Taizhou Juhuan Lifting Protection Equipment Co., Ltd , https://www.jsjoba.com