Recently, the Research Group of Optoelectronic Conversion Materials and Devices of the State Key Laboratory of High Performance Ceramics and Ultrastructure of the Shanghai Institute of Ceramics, Chinese Academy of Sciences has made important progress in photocatalytic selective reduction of carbon dioxide to produce high-value-added methane. Through the design and creation of a novel hydrogenated blue titanium dioxide material, the research group successfully achieved the efficient conversion of CO2 to produce CH4 under near-ambient pressure, and conducted in-depth research on the reaction mechanism through in-situ diffuse reflectance Fourier transform infrared technology. A large number of CO2 emissions have led to global problems such as increased greenhouse effect, rising sea levels, and acidification of water bodies. How to convert CO2 into useful energy chemicals has become a research hotspot. The use of clean and renewable solar energy to catalyze the reduction of CO2 is considered as an ideal solution to the energy crisis and environmental pollution. Currently widely used catalysts for photocatalytic reduction of CO2 are supported precious metal (such as Pt, Pd, Au, Ag) semiconductor materials, which have higher costs. TiO2 has attracted extensive attention in the field of photocatalytic reduction of CO2 due to its low cost, good availability, and good stability. However, its wide bandgap (3.2eV), photoelectron-hole pair (e−−h+) recombination, and many side reactions make the photocatalytic performance and the utilization efficiency of solar energy inefficient. In view of the above problems, starting from the design and preparation of materials and the regulation of band gaps, the research group prepared hydrogenated blue titanium dioxide containing a large number of surface defects by a simple low-temperature solvothermal method using ethylenediamine solution containing alkali metal lithium as a solvent. The material exhibited excellent photocatalytic activity for reduction of CO2 by sunlight. The space-time yield of CH4 reached 16.2 μmol g-1h-1 and the selectivity was 81%. Both were reported to be optimal at present. Through kinetic isotope effect experiments and cooperation with Han Yifan's research group of East China University of Science and Technology, the study also used in-situ infrared technology to conduct in-depth research on the reaction process and reaction mechanism. The study found that the material also showed good catalytic performance for photocatalytic hydrogen production and organic pollutant degradation. Related research results were published on ACS Catalysis and have applied for invention patents. The study was funded by the national key R&D program, the National Natural Science Foundation of China, the Chinese Academy of Sciences, and the Shanghai Science and Technology Commission. Access Ladder,Scaffold Ladder,Scaffolding Step Ladder,Scaffolding Coupler Kaiping Youying Metal Products Co., Ltd , https://www.yyscaffold.com
Highly efficient photocatalytic CO2 reduction, hydrogen production and organic degradation of hydrogenated blue titanium dioxide 
Hydrogenated blue titanium dioxide (a: Absorption of solar spectrum, b: Microstructure, c, d: In situ FTIR of photocatalytic reduction of CO2)