Preparation method for NiTe2 used for electrode material of supercapacitor

Abstract

The invention discloses a preparation method for NiTe2 used for the electrode material of a supercapacitor. The preparation method includes the following steps that: a tellurium source and a nickel source are mixed, an obtained mixture is arranged in a reactor, a reducing agent and a solvent are added into the mixture, and an obtained mixture is stirred so as to form a mixed solution; a foamed nickel sheet is e arranged in the mixed solution; and the reactor is arranged into a heating furnace, the foamed nickel sheet reacts with the mixed solution for some time; the nickel sheet is removed out; absolute ethyl alcohol and deionized water are adopted to repeatedly wash the nickel sheet, and then, the washed nickel sheet is arranged in a drying oven of a temperature of 60 DEG C so as to be dried, and finally, a dried nickel sheet can be obtained, and the NiTe2 material can be finally formed on the surface of the nickel sheet. The NiTe2 material used for the electrode of the supercapacitor which is prepared by using the preparation method of the invention has high specific capacitance and very excellent cyclic stability; the charge transfer resistance of the NiTe2 is as low as 0.021 ohm; and the NiTe2 can keep 100% capacitance after having been subjected to 1000 times of cyclic distance-current discharge.

Description

technical field [0001] The invention relates to the field of batteries, in particular to the field of electrode materials for supercapacitors and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device, which uses porous carbon materials with high specific surface area as electrodes or uses electrode active materials for underpotential deposition, so that it can undergo rapid and reversible chemical adsorption / desorption or oxidation / reduction reactions to Obtain the capacitance of the order of Faraday, so it has both the energy storage characteristics of the battery and the power characteristics of the capacitor. It is thousands of times higher than the specific energy of the traditional electrolytic capacitor, and the leakage current is thousands of times smaller. It can charge and discharge 100,000 times More than one time without maintenance and maintenance, it can be used in the working state of instantaneous dis...

AI Technical Summary

Problems solved by technology

Among transition metal oxides, RuO 2 It has a high specific capacitance, but its high cost, low reserves and serious environmental pollution limit its practical application

Other transition metal oxides such as MnO 2 , NiO and Co 3 o 4 , have also been extensively studied, these electrode materials compared to RuO 2 In terms of relatively low energy density, where MnO 2 There are abundant reserves, low cost, environmental friendliness, and high theoretical specific capacitance value, but its actual specific capacitance is low due to its poor conductivity

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