Recently, Sun Yongfu and Xie Yi, the professors of the Hefei National Research Center for Microscale Material Science, University of Science and Technology of China, have made new progress in the photocatalytic selective reduction of CO2. The research team designed an ultra-thin nanosheet catalyst with bimetallic active sites and studied its effect on the selectivity of CO2 photoreduction products. As we all know, the energy crisis caused by the excessive use of fossil fuels and the greenhouse effect caused by excessive emissions of carbon dioxide are two major issues that currently affect human sustainable development. Inspired by plant photosynthesis, researchers designed to use artificial photosynthesis to convert carbon dioxide into hydrocarbon fuel under natural environmental conditions. This not only helps to reduce the concentration of CO2 in the air, but also can obtain high value-added carbon-based fuel. However, the variety of CO2 reduction products and the reduction potential of the reduction products are similar, so that the selectivity of the reduction products cannot be effectively controlled. Taking the simplest hydrocarbons (CO) and hydrocarbons (CH4) as examples, from a thermodynamic point of view, the reduction potential (-0.52 V vs. NHE) required to generate CO is greater than the reduction potential required to generate CH4 (-0.24 V vs. NHE) is negative, so the formation of CH4 is thermodynamically superior to that of CO; however, the reduction of CO2 to CO is a 2-electron reduction reaction, and the generation of methane is an 8-electron reduction reaction, so Kinetically speaking, the generation of CO should be easy to generate CH4. From this, it can be seen that the highly selective reduction of CO2 to CH4 still faces huge challenges. In view of this, the research group designed and constructed a bimetallic site-type ultra-thin nanosheet, in order to achieve precise control of the selectivity of CO2 reduction products. Taking the prepared CuIn5S8 ultra-thin nanosheet as an example, the theoretical simulation and in-situ infrared spectroscopy test results confirmed that the low-coordinate Cu and In sites can interact with carbon dioxide molecules to generate highly stable Cu-CO-In intermediates. However, when this intermediate breaks the Cu-C bond and the CO bond to form a free-form CO molecule, it needs to overcome a very high reaction energy barrier; by comparison, hydrogenation is performed on the C atom of the intermediate to form a CHO intermediate The reaction is exothermic and can proceed spontaneously, making it more inclined to obtain methane selectivity close to 100%. The photocatalytic test results confirmed that the selectivity of CuIn5S8 ultra-thin nanosheets containing sulfur defects under the driving of visible light to reduce CO2 to CH4 reached nearly 100%, and the average yield was 8.7 μmol g-1 h-1. This work changes the configuration of key reaction intermediates, adjusts the reaction barrier, and then changes the reaction path by constructing bimetallic site CuIn5S8 ultra-thin nanosheets, which ultimately changes the reduction product from CO to CH4. The selective and highly active carbon dioxide photoreduction catalyst system provides new ideas. Related results were published in Nature Energy (2019, DOI: 10.1038 / s41560-019-0431-1). Car Elevator,Auto Elevator,Automobile Elevator,Car Lift Elevator Homefriend&FUJI Elevator Co.,Ltd , https://www.jfujilift.com