Hydrogenated Blue Titanium Dioxide Photocatalytic CO
2Reduction, hydrogen production and organic matter degradation
Hydrogenated blue titanium dioxide (a: absorption of the solar spectrum, b: microstructure, c, d: photocatalytic reduction of CO
2In-situ infrared spectrum)
Recently, the Chinese Academy of Sciences Shanghai Institute of Ceramics high performance ceramics and ultrastructure of the State Key Laboratory of photoelectric conversion materials and devices research group, in the photocatalytic selective reduction of carbon dioxide to produce high value-added methane research has made important progress. Group through the new hydrogenated blue titanium dioxide material design and creation, the successful realization of near-ambient pressure water reduction CO 2Preparation CH 4Efficient conversion, and in-situ diffuse reflectance Fourier transform infrared technology, the reaction mechanism in-depth study.
A lot of CO 2Of the efflux led to intensified greenhouse effect, sea level rise, water acidification and other global issues, how to CO 2The conversion into useful energy chemicals has become a research hotspot.Using clean renewable solar energy catalytic reduction CO 2, Is considered to be the ideal way to solve the energy crisis and environmental pollution.Currently widely used photocatalytic reduction of CO 2Of the catalyst for the load of precious metals (such as Pt, Pd, Au, Ag) semiconductor materials, higher cost. 2Due to cheap and easy to obtain, the advantages of good stability have been photocatalytically reduced CO 2However, its wide bandgap (3.2eV), serious recombination of photogenerated electron-hole pairs (e - h +) and many side reactions make the photocatalytic performance and solar energy utilization efficiency low .
In response to the above problems, the research group from the material design and preparation of band gap regulation, dissolved in alkali metal lithium ethylenediamine solution as solvent, prepared by a simple low-temperature solvothermal hydrogenated blue titanium dioxide containing a large number of surface defects. The material exhibits excellent photocatalytic reduction of CO 2Performance, CH 4The space-time yield of 16.2μmol g -1h-1, The selectivity of up to 81%, are the best reported at present.Through the kinetic isotope effect experiment and with the East China University of Science and Technology YAN Yifan task group cooperation, the study also in situ infrared and other techniques on the reaction process and the reaction mechanism in-depth study. The study found that the material on the photocatalytic hydrogen production and degradation of organic pollutants also showed good catalytic properties.
Relevant research results have been published on ACS Catalysis and have been applied for invention patents.The research was supported by the national key research and development program, the National Natural Science Foundation of China, the Chinese Academy of Sciences, the Shanghai Municipal Science and Technology Commission and other funding.
