Study On The Preparation And Catalytic Performances Of CdIn₂O₄ Nanoparticles Composites For Glucose Oxidation

In recent years,due to the growing demand for glucose sensors in the fields of health care,food and biotechnology,the global market of glucose sensors has increased significantly.Nonenzymatic glucose electrochemical sensor has been extensively researched for its high sensitivity,good selectivity,low detection limit,etc.The key factor affecting its performance is the electrode material.CdIn₂O₄ has excellent photoelectric,thermoelectric and catalytic properties.The application of CdIn₂O₄ in glucose detection not only provides a new direction for its performance research,but also provides a new choice for glucose detection.In addition,the conductive skeleton of foamed nickel can improve the conductivity of materials,provide more active degrees of electrochemistry,prevent agglomeration and structural collapse,and improve the electrochemical performance of materials.In this paper,the CdIn₂O₄ electrode materials directly grown on the surface of nickel foam nanofibers were prepared by non-aqueous sol-gel method,and glucose detection was performed.The electrode material of non enzyme glucose electrochemical sensor with excellent performance was obtained.The main results are as follows:1.Pure phase CdIn₂O₄ non enzyme glucose electrochemical sensor electrode material was directly grown on foam nickel by non-aqueous sol-gel method.The results show that the electrode material has high electrocatalytic activity,high sensitivity(3.2925 mA·mM^-1·cm^-2),fast response time(1.58 s),wide linear range(1?M?1 mM),low detection limit(0.08?M),good selectivity and long-term stability.The pure phase CdIn₂O₄ grown on foamed nickel shows good application prospects in non enzymatic glucose sensing.2.The transition metal(Fe,Co,Cu)composite CdIn₂O₄ non enzyme glucose electrochemical sensor electrode materials were successfully synthesized on foam nickel by non-aqueous sol-gel method.The experimental results show that transition metal(Fe,Co,Cu)composite CdIn₂O₄ has high sensitivity and good selectivity for the electrochemical sensing of glucose,and its performance is basically better than that of pure phase CdIn₂O₄.The optimum performance of Fe-CdIn₂O₄ electrode material is that the composite content is 30%,and its sensitivity is 8.992 mA·mM^-1·cm^-2.The optimum composite content of Co-CdIn₂O₄ electrode material is 15%,and the highest sensitivity is 16.104 mA·mM^-1·cm^-2.The optimum composite performance of Cu-CdIn₂O₄electrode material is 15%,and its sensitivity reaches 5.303 mA·mM^-1·cm^-2.Because transition metal(Fe,Co,Cu)composite CdIn₂O₄ electrode materials are prepared by the same method,the higher the sensitivity,the better the electrocatalytic performance for glucose.It was found that the sensitivity of 15%Co-CdIn₂O₄>30%Fe-CdIn₂O₄>15%Cu-CdIn₂O₄>pure phase CdIn₂O₄.3.The electrochemical kinetics of the electrocatalytic oxidation of glucose was analyzed by cyclic voltammetry.The results showed that the electrochemical process of the transition metal(Fe,Co,Cu)composite CdIn₂O₄ electrode material is mainly diffusion.Diffusion coefficient can be obtained by calculation:D_Co>D_Fe>D_Cu>D_{pure phase},the electrocatalytic performance for glucose is 15%Co-CdIn₂O₄>30%Fe-CdIn₂O₄>15%Cu-CdIn₂O₄>pure phase CdIn₂O₄.It is further shown that the catalytic performance of transition metals(Fe,Co,Cu)with CdIn₂O₄ is greatly improved.