Synthesis Of MOFs-derived Fe/Ni-based Nano Catalyst And Their Electrocatalytic Performance

Metal-organic frameworks（MOFs）have large specific surface areas and tunable structures,and materials derived from them can retain their excellent structural characteristics and are more stable than MOFs.Due to their structural diversity,functional tunability,and large specific surface area,the development of metal-organic frameworks provides new opportunities and platforms to design various types of catalysis.These derivatives possess good tunability and electronic conductivity components while inheriting the original structure with large surface area and abundant pore structure.MOFs exhibit a stable pore structure,which provides the possibility for metal@MOFs,and the metal@MOFs series of materials are particularly useful for applications in the fields of heterogeneous catalysis,gas storage,and electrochemistry.Accordingly,Cu-BTC and ZIF-67 can be used as loading substrates,and ferrocene（Fe（C₅H₅）₂）and nickelocene（Ni（C₅H₅）₂）can be simultaneously loaded into MOFs by chemical vapor deposition to prepare MOFs.Fe/Ni@MOFs material,and then the corresponding catalyst material was derived by pyrolysis method,and its electrocatalytic performance was tested.The main research results are as follows:1.The influence of chemical vapor deposition（MOCVD）on the loading effect under different loading temperatures and loading ratios was explored by the control variable method,and the appropriate conditions for synthesizing bimetallic supported MOFs were determined,and Fe was synthesized.For Fe/Ni@Cu-BTC material with uniform distribution of Ni and Ni,the supported Fe and Ni contents are 4.74%and9.76%,the particle size of the two metal nanoparticles is also smaller.And under the same conditions,Fe/Ni@ZIF-67 materials with uniform distribution of supported metals were synthesized.2.On the basis of the above synthetic materials,the corresponding metal@oxide-carbon electrocatalyst materials were derived.The OER catalytic performance of Fe/Ni@CuO-C materials was tested in the environment of 1M KOH solution at room temperature and standard pressure.When the density is 20 m A·cm^-2,the overpotential of the material is 240 m V,and Tafel slope is 54 m V·dec^-1.The impedance test shows that the interface charge transfer resistance（Rct）is small and stable,and the continuous test for 30h,the performance decline is not obvious,indicating that the prepared material has good performance in the catalysis of oxygen evolution reaction.The HER catalytic performance of Fe/Ni@Co₃O₄-NC material was tested,and the test results also showed that Fe/Ni@Co₃O₄-NC material had better performance in HER catalysis.The catalytic performance of the above two bimetal supported materials is better than that of the corresponding single metal supported materials,which proves that the bimetal supported catalyst can show better performance in electrocatalysis than the single metal supported,and it is very potential for electrocatalysis.Materials in the field of catalysis also provide a new method and idea for the preparation of materials in electrocatalysis and even other fields.