Preparation method of nickel-titanium-aluminum hydrotalcite supercapacitor electrode material with porous structure

Abstract

The invention discloses a preparation method of a nickel titanium aluminum hydrotalcite supercapacitor electrode material with a porous structure, which comprises the following steps of: preparing nickel sulfate, aluminum sulfate and titanium sulfate into a mixed salt solution, and preparing urotropine into an aqueous solution; putting the mixed solution into a reaction kettle, sealing, and reacting at 160 DEG C for 4 hours; filtering the precipitate obtained by the reaction, washing with deionized water and ethanol respectively, and drying the product in a drying oven to obtain nickel-titanium-aluminum hydrotalcite powder; performing alkali etching on the obtained nickel-titanium-aluminum hydrotalcite powder in a NaOH solution to obtain nickel-titanium-aluminum hydrotalcite with a porous nanostructure; and cleaning and drying the etched product. The porous hydrotalcite nanosheet obtained by the method disclosed by the invention is beneficial to the flowing of electrolyte among pores vertical to the sheet layer, the flowing distance of the electrolyte is shortened, the contact of the electrolyte and an active substance is facilitated, and the electrochemical reaction rate is improved. The hydrotalcite prepared by adopting the method disclosed by the invention is applied to a supercapacitor electrode material and has relatively high specific capacitance.

Description

technical field [0001] The invention belongs to the technical field of supercapacitors, and in particular relates to a method for preparing a porous structure nickel-titanium-aluminum hydrotalcite supercapacitor electrode material. Background technique [0002] Transition metal hydrotalcites have certain advantages as supercapacitor electrode materials. Hydrotalcite is a layered material, which has a large theoretical specific surface area, and the metal ions and interlayer coordination anions that make up the hydrotalcite laminates can be changed, so that the hydrotalcite composition has great flexibility. Moreover, transition metal hydrotalcites can store energy through oxidation-reduction reactions, and the energy storage capacity is much larger than that of carbon materials. These advantages make hydrotalcite materials have good application value in the field of supercapacitor electrode materials. [0003] At present, there are many methods for preparing hydrotalcite, ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many methods for preparing hydrotalcite, such as co-precipitation method, hydrothermal method, template method, etc., but due to the electrostatic force between the hydrotalcite slabs, the synthetic hydrotalcites prepared by these methods have different degrees of lamellar accumulation, which is obvious. Reduce the specific surface area value of the material, it is difficult for the electrolyte to enter the interlayer, and the electrochemical reaction can only occur on the surface of the plate layer, the electrochemical reaction rate is low, and the utilization rate of the electrochemical active site is low

Due to the inherent semiconductor properties of hydrotalcite itself, the internal resistance of charge transfer is relatively large, so the supercapacitive performance of transition metal hydrotalcite cannot be fully utilized.

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