Sodion-embedded manganese dioxide nanometer sheet electrode as well as preparation method and application of electrode

Abstract

The invention relates to a sodion-embedded manganese dioxide nanometer sheet electrode as well as a preparation method and an application of the electrode. The electrode can be used as the active material of a supercapacitor and comprises sodion-embedded manganese dioxide nanometer sheets evenly distributed on the surface of a foamed nickel substrate. The preparation method comprises the following steps of: (1) mixing sodium sulfate and manganese acetate to prepare an electrochemical deposition precursor solution; (2) setting up an electrochemical deposition platform through a three-electrode method and taking the foamed nickel substrate after pretreatment as a working electrode, a platinum electrode as a counter electrode and a saturated calomel electrode as a reference electrode; (3) soaking the electrodes in the electrochemical deposition precursor solution at same depth; (4) opening an electrochemical workstation, setting the working electrode to the anode, setting the working mode to a timing potential mode, and starting up the electrochemical workstation; (5) taking out and washing the working electrode after the electrochemical workstation stops working; and (6) drying to obtain the sodion-embedded manganese dioxide nanometer sheet electrode. The sodion-embedded manganese dioxide nanometer film electrode as well as the preparation method and the application of the electrode disclosed by the invention have the characteristics of simple technique, mild reaction condition and excellent electrochemical performance of materials.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and electrochemistry, and in particular relates to a sodium ion embedded manganese dioxide nanosheet electrode and a preparation method thereof. The electrode can be used as an active material of a supercapacitor. Background technique [0002] With the ever-increasing demand for energy, exploring new clean energy materials with excellent performance has become a challenge today. Manganese dioxide, as a pseudocapacitive material for supercapacitors, has gradually become widely studied worldwide due to its high capacity, low cost, and environmental friendliness. [0003] However, there are also some problems in the research of manganese dioxide supercapacitors: first, its energy density as a supercapacitor still cannot meet the needs of practical applications; second, although its electrochemical properties such as power density and cycle performance have been very good , but in some demandin...

AI Technical Summary

Problems solved by technology

[0003] However, there are also some problems in the research of manganese dioxide supercapacitors: first, its energy density as a supercapacitor still cannot meet the needs of practical applications; second, although its electrochemical properties such as power density and cycle performance have been very good , but in some demanding practical applications, its performance still needs to be further improved; finally, according to the current research, manganese dioxide is accompanied by redox reactions in the faradaic charge and discharge process, however, in the actual cyclic voltammetry test No corresponding redox peaks were observed in

However, better electrochemical performance in sodium sulfate solution by intercalating electrolyte sodium ions between MnO2 crystal layers has not been reported yet.

Images