Preparation Of Ni?Co/C Based Nanocomposite Materials And Their Application In Non-enzymatic Electrochemical Sensors

Detection of hydrogen peroxide,dopamine,ascorbic acid and other small molecules have attracted great attention due to its wide application in medical and health care,environmental science,food industry and other fields.Enzymatic electrochemical sensors are popular due to their high sensitivity and selectivity toward molecules detection.However,they often suffer from high cost and sensitive to the environment.Therefore,it is highly desired to develop non-enzymatic electrochemical sensor with appropriate material.Precious metals and their alloys nanostructures show better catalytic activity toward electrochemical analysis,but their high cost and limited reserves hindered their practical application.Nickel,cobalt,carbon and other materials are the ideal materials to make enzyme-free chemical sensor with low cost,environmental and other advantages.The main works and results are included as follows:(1)The material precursors were prepared by one step hydrothermal method,then calcined in air atmosphere to obtain the cobalt oxide/biochar nanocomposite material,and the enzyme-free hydrogen peroxide sensor was constructed.The structure and morphology of the material were observed by SEM and XRD.The performance of the sensor was studied by cyclic voltammetry and current-time curve.(2)Polypyrrole nanotubes were prepared by template method,and then polycrystalline pyrrole nanotubes were calcined at high temperature in argon atmosphere to obtain carbonized nanotubes and an enzyme-free dopamine electrochemical sensor wasconstructed.The structure and morphology were characterized by SEM and XRD.The electrochemical detection performance of dopamine was studied by cyclic voltammetry and current-time curve.(3)The nickel cobalt bimetallic and graphene composite precursors were prepared by hydrothermal method,and then the nickel cobalt oxide/reduced graphene oxide nanocomposite were obtained by calcination in air atmosphere.The structure and morphology of the materials were observed by SEM and XRD.The electrochemical detection performance of the ascorbic acid was studied by cyclic voltammetry and current-time curves.