Home > News > Advanced materials: photothermal fabrication technology -- realizing two-dimensional non layered structure materials and introducing bifunctional oxygen defects

Advanced materials: photothermal fabrication technology -- realizing two-dimensional non layered structure materials and introducing bifunctional oxygen defects

wallpapers News 2020-12-19

has great potential to use solar energy to drive catalytic reaction because its energy consumption is far lower than that of traditional thermal catalysis electrocatalysis. However sufficient light absorption is a prerequisite for efficient solar catalytic process. In the system of oxide catalytic materials it is a simple effective method to make oxygen defects which can broaden the absorption spectrum enhance the absorption intensity; at the same time surface oxygen defects are the catalytic active sites of many reactant molecules. However these ultra-thin materials can be easily destroyed by the traditional thermal treatment of ultra-thin oxygen. Therefore the introduction of oxygen defects into ultra-fine ultra-thin microstructures is a great challenge to the synthesis technology.

indium oxide (In2O3) is a kind of important catalytic materials. Its crystal structure is non layered structure. It is difficult to prepare it into ultra-thin two-dimensional structure introduce oxygen defects. In cooperation with school of materials science engineering of Tianjin University School of chemistry of Huazhong Normal University National Institute of materials materials (NIMS) of Japan the ultra-thin indium oxide nanosheets (Fig. C-E) were prepared by hydrothermal method then photothermally treated in the reaction atmosphere of CO2 hydrogenation reduction At the same time it is found that these surface oxygen defects play an important role in the adsorption activation of CO2 molecules the stabilization of reaction intermediates. The above two favorable factors effectively promote the photocatalytic hydrogenation of CO2. In addition in addition to electron spin resonance (ESR) X-ray photoelectron spectroscopy (XPS) characterization the oxygen defects of In2O3 series materials were observed directly by transmission electron microscopy (abf-stem) for the first time. The researchers believe that this research will provide a useful reference for the preparation modification of ultra-fine ultra-thin materials. The preparation of catalytic materials based on solar energy the use of both to drive catalytic reaction may become a model of low-energy industrial catalysis in the future.


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