Ultrahigh specific capacity mesoporous Co3O4 nanosheet electrode material and preparation method thereof

Abstract

The invention provides an ultrahigh specific capacity mesoporous Co3O4 nanosheet electrode material and a preparation method thereof. The preparation method comprises the following steps that 1) foam nickel is adopted to act as the three-electrode system of a working electrode, the mixed aqueous solution of Co(NO3)2 and KCl acts as an electrolyte solution, and a Co(OH)2 nanosheet is deposited on the surface of foam nickel through constant current so that a Co(OH)2 nanosheet precursor is acquired; and 2) the Co(OH)2 nanosheet precursor acquired in the step 1) is cleaned and dried, and then high temperature annealing is performed at temperature of 350-450 DEG C so that the mesoporous Co3O4 nanosheet electrode material is acquired. According to the preparation method of the ultrahigh specific capacity mesoporous Co3O4 nanosheet electrode material, the preparation method has the characteristics of being simple in technology, green and environment-friendly and low in cost, and the acquired Co3O4 nanosheet electrode material has relatively high specific capacity.

Description

technical field [0001] The invention relates to the field of supercapacitor electrode material manufacturing technology and green energy technology, in particular to a constant current deposited ultra-thin mesoporous Co 3 o 4 Nanosheet electrode material and preparation method thereof. Background technique [0002] In recent years, with the gradual reduction of non-renewable energy sources and more and more serious environmental problems in the world, green and pollution-free new high-energy chemical power sources have become a hot spot for the development of countries all over the world. Supercapacitors have attracted widespread attention as important energy storage devices due to their high power density, fast charge-discharge performance, and long cycle life. It is divided into electric double layer capacitance and pseudocapacitance. The lower energy density of traditional electric double layer capacitors limits its application. On the contrary, pseudocapacitors can ch...

AI Technical Summary

Problems solved by technology

However, currently reported Co 3 o 4 Electrode materials still need to be improved: 1) Low specific capacity: currently reported based on Co 3 o 4 The specific capacity of the electrode material is much lower than the theoretical value

2) When high current discharge, Co 3 o 4 The large potential drop caused by the internal resistance of the electrode material and the insufficient faradaic reaction of the electroactive material lead to its low capacity retention

3) Poor cycle stability: With the increase of the number of cycles, the specific capacity of the electrode material is rapidly attenuated due to the collapse of the structure, the slowdown of mass transfer and charge transfer, and the insufficient electrochemical reaction.

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