"Energy crisis" and "environmental pollution" are two major problems faced by the world today. Semiconductor materials can use solar energy to drive photocatalysis to decompose aquatic hydrogen, providing a possibility for clean hydrogen to replace fossil fuels. However, how to increase the efficiency of photocatalytic hydrogen production and the stability of photocatalyst is the key scientific problem in this field. Recently, the New Energy Storage and Energy Conversion Nanomaterials Research Center of the State Key Laboratory of Electrical Insulation of Electric Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, for the first time used a method of atomic layer deposition to design a new class of CdS@ZnO cores with controlled ZnO shells. Compared with the traditional liquid-phase synthesis, the shell-structured composite catalyst obtains a close contact interface between the two semiconductors, effectively improves the separation and transmission efficiency of the photogenerated electrons and holes, and thus makes the catalytic efficiency of the composite semiconductor. The efficiency of photocatalytic hydrogen production from CdS@ZnO prepared by this method is as high as 98.82 mmol/g/h, which is 5.6 times higher than the highest hydrogen production efficiency of the previously reported CdS-ZnO system. In addition, since the ZnO shell can effectively prevent the photocorrosion of the CdS core, the composite catalyst exhibits excellent photocatalytic stability. This result is expected to be widely used in the field of photocatalytic hydrogen production, achieving a significant increase in catalytic efficiency and catalytic stability. The research results were published in Nano Energy's top journal Nano Energy under the title of "Rational design of CdS@ZnO core-shell structure via atomic layer deposition for drastically enhanced photocatalytic H2evolution with excellent photostability". The first author is a doctoral student in the School of Electrical Engineering. Ma Dandan, the author of the correspondence is Niu Chunming, Associate Professor Shi Jianwen of the 1000-person team of the School of Electrical Engineering. The international partner of the thesis is Professor Wang Lianzhou of the University of Queensland, Australia. Xi'an Jiaotong University is the first author and the first communication unit. The New Energy Storage and Conversion Nanomaterials Research Center (http://cne.xjtu.edu.cn) aims at the development of new energy technologies and focuses on the research direction of new types of energy storage and energy conversion nanomaterials to develop a micro/mesostructure of materials. The chemical characteristics-nano-preparation technology is the core research work, and the research and implementation of the new energy conversion and energy storage system demonstration project lead the development and construction of electrical engineering disciplines, and realize theoretical innovation and research method innovation in this field. There have three type screw pumps: 1. Single Screw Pump. 2. Three Screw Pump. 3. twin screw pump 1. single screw pump usually been used to transfer sludge, mud, sauce etc thick liquid. 2. three screw pump usually beed usde to transfer the temperature not higher than 150 degree diesel fuel oil, lubricating oil etc oil. and heat insulation triple screw pump beed used to transfer bitumen, heavy oil etc, pump can bear 300 degree high temperature. Screw Pump,Screw Type Pump,Screw Vacuum Pump,Rotary Screw Pump Hengshui Yuanhan Trading Co.,Ltd , https://www.hengshuiyuanhanpump.com
Xi'an Jiaotong University made important progress in the photocatalytic decomposition of hydrogen-producing hydrogen catalysts