Synthesis And Electrochemical Properties Of MOFs Based Materials

In recent years,energy and environmental issues have limited the development of ociety,to seek a new type of energy,which have no pollution to the environment,to replace the fossil fuels and other energy with serious environmental pollution is urgently needed.Hydrogen evolution and oxygen electrocatalysis reactions are of great impotant in the field of electrochemical reaction.In order to improve the catalytic activity and make the hydrogen evolution and the oxygen electrocatalysis easier,it is needed to find new and efficient electrochemical catalytic materials to replace noble metal-based electrocatalysts.As a new highly ordered porous crystalline material,Metal-organic frameworks?MOFs?have high specific surface area,adjustable pore size and can be modified,make it one of the new research hotspots in the field of gas adsorption,chiral separation,electrocatalysis and so on.Compared with the traditional-metal electrocatalytic materials,MOFs materials have many advantages,for example,it can direct as the raw material and template material,also we can obtain electrocatalytic materials derived from MOFs,which with high specific surface area,high dispersion,high catalytic activity.In this paper,we focus on the design and synthesis of MOFs,several kinds of electrocatalytic materials were successfully synthesized by carefully selection reaction conditions and using post-synthesis method.The structures and properties of the electrocatalysts are characterized by X-ray single crystal diffraction,elemental analysis,thermogravimetric analysis,infrared analysis,X-ray powder diffraction,scanning electron microscopy,electrochemical tests ect.The main research contents are as follows:?1?Synthesis and Properties of Complexes Co-TCPP.(Co₃?TCPP??CH₃COO?]?H₃O⁺?DMA?1?was prepared by using the porphyrin-based tetramethylpyrazone with bare and unsaturated sites self-assembly with Co²⁺.Crystalline diffraction structure analysis revealed that complex Co-TCPP was a three-dimensional structure.In the alkaline medium investigated the electrochemical properties,found that the complexes Co-TCPP are not only show excellent activity for the oxygen evolution,but also show the excellent activity for oxygen reduction,the dual functionality indicated that the catalyst has the potential prospect of electrocatalysis in situ.?2?Synthesis and Properties of Complexes Cu-CNTCPP and Zn-CNTCPP.(Cu?CNTCPP?]?2DMF and Zn-CNTCPP were prepared by self-assembly of Cu²⁺and Zn²⁺ with porphyrin-based tetrabromoporphyrins with barely unsaturated sites.X-ray single crystal diffraction structure analysis found that complex Cu-CNTCPP is a zero-dimensional structure and complex Zn-CNTCPP is a two-dimensional structure.In the alkaline medium investigated the electrochemical properties of the complex Cu-CNTCPP and Zn-CNTCPP indicating that the catalyst has the potential prospect of electrocatalysis in situ.?3?Synthesis and Electrochemical Properties of Nanometer Oxide.?MOF-71-Co?was used as the precursor to synthesize nano-oxide materials by pyrolysis under different conditions with different electrochemical properties.The experimental results show that the nano-cobalt oxide obtained by 400^oC pyrolysis under nitrogen has excellent electrical conductivity,possibly because they have a larger specific surface area and more active sites.In addition,the synergistic effect of cobalt oxide and carbon material not only increases the catalytic activity of the site,but also improves its conductivity.