Preparation Of Multicomponent Metal/Graphene Mimic Enzyme And Its Application In Sensors

The graphene nanocomposites have excellent electrocatalytic properties and can be used to modify electrodes.Graphene as a carrier can improve the dispersibility of the active substances such as metal nanoparticles and facilitate electron transport,thereby improving the catalytic activity against the substrate.The use of synergistic action between graphene and nanomaterials has led to the development and construction of novel highly sensitive.Highly selective chemically modified electrodes that have become an important aspect of graphene applications.In this paper,a new graphene nanocomposite was prepared and used to modify the electrodes.Various experiments were carried out and applied to hydrogen peroxide?H₂O₂?sensor.Two kinds of H₂O₂ mimic enzymes were prepared by solvothermal method and electrodeposition method,and their sensitivity,selectivity and stability were tested.The main research contents are as follows:?1?Zinc ferrite/rGO?ZnFe₂O₄/rGO?was synthesized by solvothermal method and modified on the surface of glassy carbon electrode?GCE?.Compared to pure ZnFe₂O₄ nanospheres,the addition of graphene reduced particle agglomeration.The large specific surface area of graphene and the porous structure of ZnFe₂O₄ contribute to improved catalytic activity in the reduction of H₂O₂.?2?Pd/ZnFe₂O₄/rGO-GCE was prepared by electrodeposition of Pd using amperometry.The electrodeposition method can selectively deposite Pd,which ensuring the purity of Pd.The effect of scanning rate on the electrochemical behavior of H₂O₂ was studied.The reduction of H₂O₂ on the modified electrode surface is mainly the adsorption control process.The synergistic effect between graphene,ZnFe₂O₄ and Pd improve the catalytic efficiency.The preparation method of the modified electrode is simple,rapid and has good stability.The sensitivity is 621.64?A mM^-1 cm^-2.?3?Pt/ZnFe₂O₄/rGO-GCE was prepared by electrodeposition of Pt through cyclic voltammetry and applied to H₂O₂ sensor.The detection limit is 0.1?M.