Study on Multi-scale Structure and Electronic Properties of Two-dimensional Catalytic Materials of Dalian Institute of Chemicals
Recently, Deng Dehui, a deputy researcher of the State Key Laboratory of Catalysis of the Chinese Academy of Sciences, and Bao Xinhe, a member of the Academician of the Chinese Academy of Sciences, successfully achieved the control of the multi-scale structure and electronic properties of two-dimensional molybdenum sulfide crystals. The relevant research results were published in Nature Communications (DOI: 10.1038/ncomms14430). Due to its unique physical and chemical characteristics, two-dimensional molybdenum sulfide has great application prospects in light, electricity and traditional heterogeneous catalysis. The two-dimensional molybdenum sulphide catalytic reaction usually involves multiple steps and complex processes, such as the electrohydrocatalytic decomposition of water to produce hydrogen (H2), liquid (H2O), and solid (catalyst) three-phase interfaces, which require structural and electronic properties. Multi-scale control and optimization to give it excellent intrinsic activity and suitable surface structure. At present, research in this area is still an important challenge. The research team used a "bottom up" synthesis method to synthesize directly mesoporous foam molybdenum sulfide using silica nanospheres as a hard template to achieve effective control of the properties on a three-dimensional scale: (1) At the macroscopic scale, the uniform mesopores facilitate the transport of the reactants (H3O+) and products (H2), the more hydrophilic surface facilitates the contact of the active sites of the catalyst; (2) at the nanometer scale, The oriented and vertically grown molybdenum sulfide nanosheets in the mesoporous framework provide abundant edge catalytic active sites; (3) At the atomic scale, the monoatomic catalyst was introduced into the molybdenum disulfide framework at the early stage (Energy Environ. Sci (, 2015, 8, 1594-1601), the introduction of transition metal cobalt atoms into the molybdenum sulfide plane, replacing molybdenum atoms, effectively modifying the electronic structure of the surface sulfur atoms, stimulating the intrinsic catalytic activity of the surface sulfur atoms, There is a moderate cobalt atom doping amount (16.7%) that modulates the catalytic activity to an optimal value. The mesoporous sulfide-based molybdenum-based catalysts based on this multi-scale control exhibit excellent hydrogen production performance from acidic electrolyzed water, demonstrating its potential to replace precious metal catalysts. The multi-scale structure and electronic property control strategies proposed in this work provide new research ideas for the research and application of two-dimensional molybdenum sulfide in the field of catalysis, and provide references for the design and development of similar two-dimensional catalytic materials. The above research work was supported by the National Key Research and Development Program of the Ministry of Science and Technology, the National Natural Science Foundation of China, the Frontier Science Key Research Project of the Chinese Academy of Sciences, the Nano Pilot Project of the Chinese Academy of Sciences and the Collaborative Innovation Center of Energy Materials Chemistry (iChEM) of the Ministry of Education. Aluminum Alloy Handle,Circular Door Handle,Invisible Door Handle,Bathroom Glass Door Handle Zhaoqing Muyi Hardware Products Co., Ltd , https://www.muyihardware.com