Pure-phase spinel Co3O4 multistage nanosheet, soft template preparation method thereof and application thereof in supercapacitor

Abstract

The invention discloses a pure-phase spinel Co3O4 multistage nanosheet, a soft template preparation method thereof and application thereof in a supercapacitor, which belong to the field of nano energy storage structure material preparation technology and electrochemical application. Sodium dodecyl sulfate which is common in life is adopted as a soft template, a nanoflower precursor with uniform morphology is obtained through oil bath heating, Co3O4 with a multistage nanosheet structure is obtained after proper annealing, Co3O4 is mixed with PTFE and then loaded on foamed nickel, and the supercapacitor anode with good performance can be obtained. The specific capacitance value of the supercapacitor obtained by using the anode is 342.8 C.g<-1> (the current density is 1A.g<-1>), the rate capability is 58.8% (the current density is increased by 16 times), the production cost is reduced, and the anode has a good industrial application prospect. Besides, when the pure-phase spinel Co3O4 multistage nanosheet is used for manufacturing an electrode material of the supercapacitor, carbon powder does not need to be added, so that the manufacturing cost is reduced, the contribution of carbon to the capacitor is eliminated, and the performance result of the supercapacitor is more reliable.

Description

technical field [0001] The invention belongs to the field of preparation technology and electrochemical application of nanometer energy storage structure materials, and specifically relates to a two-dimensional nanosheet spinel transition metal oxide and its preparation method and application in supercapacitors. More specifically, the present invention involving a pure phase spinel Co 3 o 4 Hierarchical nanosheets and their soft template preparation methods and applications in supercapacitors. Background technique [0002] In the prior art, spinel Co with a two-dimensional nanosheet structure 3 o 4 The preparation process is complex, the synthesis cycle is long, and the etchant has certain environmental toxicity, which is not conducive to the green development of the surrounding environment; the prepared spinel Co 3 o 4 As a supercapacitor material, the rate performance is low, and it needs to be used in combination with other carbon materials to achieve high-performanc...

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Problems solved by technology

[0002] In the prior art, spinel Co with a two-dimensional nanosheet structure 3 o 4 The preparation process is complex, the synthesis cycle is long, and the etchant has certain environmental toxicity, which is not conducive to the green development of the surrounding environment; the prepared spinel Co 3 o 4 As a supercapacitor material, the rate performance is low, and it needs to be used in combination with other carbon materials to achieve high-performance energy storage.

However, the preparation of specific carbon materials (graphene, carbon nanotubes) requires relatively harsh conditions, so more toxic reagents are required in the process of preparing these materials, and the energy consumption is high, which increases the production cost.

In addition, currently synthesized Co 3 o 4 Nanoflowers require a high-pressure environment such as a reactor, which virtually increases the risk of operation; or requires the use of a metal foam substrate to grow nanomaterials with uniform size, and the growth amount is small, which makes it impossible to achieve large-scale production and application, which is not conducive to subsequent practical applications. Industrialization development

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