Application Of Metal-organic Framework Materials In Electrocatalysis And Electrochemical Sensing

Metal-organic framework materials（MOFs）,refer to a kind of porous materials assembled by metal ions or clusters under the action of coordination bonds and organic ligands.Compared with traditional metal-organic materials,repeated topological units form a regular framework structure.The porous in the frame structure enable the metal-organic frame material to have a larger specific surface area.This material’s regular and clear structure is convenient for discussing and studying the reaction mechanism.The regular and abundant pores ensure the material transfer in the reaction system.Therefore,it has a very broad application and development prospect in many fields such as catalysis,sensing,and adsorption.For a long time,as a comprehensive subject technology spanning basic science and applied science,electrochemistry is a basic subject combining analytical chemistry,physical chemistry,inorganic chemistry,and many other disciplines.At the same time,it also has unique application advantages in environmental science,biomedicine,modern industry,and other applied disciplines.Compared with existing catalytic reactions such as biocatalysis and homogeneous catalysis,electrochemical catalytic reactions are favored by researchers due to their advantages such as high spatial and temporal resolution,strong specificity,and simple operation.Compared with the existing thermal sensors,electromagnetic sensors,etc.,the low-cost electrochemical sensors not only ensure simple operation and are easy to use but also ensure accurate detection sensitivity and fast response speed,to prepare for attention.In this article,we study the different electrochemical reactions and develop practical applications around metal-organic framework materials.The main research content of this article is divided into two aspects:（1）After coating multi-walled carbon nanotubes（MWCNTs）on a bare glassy carbon electrode（GCE）,berlin green/multi-walled carbon nanotube modified electrode（BG/MWCNTs/GCE）was obtained by electrodeposition,Nafion/BG/MWCNTs/GCE was obtained by dripping Nafion.Based on the modified electrode,a specific electrochemical sensor for clenbuterol（CLB）detection was constructed,the linear range and detection limit of the proportional electrochemical sensor are 0.25～10.0μM and 0.17μM,respectively.Compared to the bare glassy carbon electrode,Nafion can enhance the stability and sensitivity of the composite electrode,Multi-walled carbon nanotubes can improve electrode conductivity and catalytic activity,and berlin green can be used as an internal reference electrochemical probe to improve the accuracy of clenbuterol detection,In addition,baseline calibration,peak offset correction and peak segmentation processing of electrochemical signals are carried out using stoichiometric methods,It can further enhance the accuracy of clenbuterol test.In addition,the modified electrode has good stability and reproducibility and can be successfully applied to the detection of clenbuterol in actual pork,pig liver,and pig urine samples.（2）A two-dimensional conductive metal frame material M₃（HITP）₂ with three different metals was prepared using HATP as ligand and Co²⁺,Ni²⁺and Cu²⁺as metal nodes.The materials’morphology,composition,and size were characterized by SEM,TEM,XPS,XRD,FT-IR,Raman and other basic characteristics.The synthesis of the materials was verified successfully.The catalyst is then used to electrocatalyst nitrate reduction reactions to achieve product selectivity by adjusting different metal centers.The faraday efficiency of ammonia production with Co₃（HITP）₂ catalyst is 96.27%,and the yield is 157μmol mg_cat^-1 h^-1.The Faraday efficiency of ammonia production with Ni₃（HITP）₂ catalyst is 98.93%,and the yield is 64μmol mg_cat^-1 h^-1.The Faraday efficiency of Cu₃（HITP）₂ catalyst for nitrite was98.52%,and the yield was 412μmol mg_cat^-1 h^-1,the product was quantitatively analyzed by UV-visible absorption spectrum and nuclear magnetic resonance spectroscopy.Finally,the experimental results and phenomena were analyzed by combining NMR nitrogen and hydrogen spectra,in-situ FT-IR,in-situ Raman,and theoretical calculations.