Ni-base NiO nanosheet array film electrode and preparation method thereof

Abstract

The invention provides an Ni-base NiO nanosheet array film electrode, which consists of a Ni matrix and a NiO film which covers the surface of the Ni matrix, wherein the NiO film consists of a NiO nanosheet array which grows in situ and is perpendicular to the surface of the Ni matrix; and the NiO nanosheet has a hexagonal laminated structure. The invention also provides a method for preparing the electrode. The method comprises the following steps of: 1, pretreating the Ni matrix; 2, anodizing the pretreated Ni matrix to obtain a Ni-base NiO porous film; and 3, performing steam heat treatment on the Ni-base NiO porous film to obtain the Ni-base NiO nanosheet array film electrode. According to the Ni-base NiO nanosheet array film electrode, a preparation process is simple, a process flow is short, and the production efficiency is high; and the Ni-base NiO nanosheet array film electrode is large in specific surface area and advanced in pore structure, and has the high electrochemical performance and circular stabile performance.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a Ni-based NiO nanosheet array film electrode and a preparation method thereof. Background technique [0002] Due to its wide source, environmental friendliness, and excellent electrochemical performance, NiO has broad application prospects in the fields of electrocatalysis and supercapacitors. NiO electrodes can be divided into powder electrodes and thin film electrodes according to their existing forms. The scraper method is often used to make NiO powder materials into electrodes, which is to uniformly mix the NiO powder materials prepared by various methods with conductive agents and binders, and perform slurry treatment to make preforms, and then use The preform and the current collector substrate (usually foamed Ni) are bonded by the knife coating method, and then pressed (the usual pressure is 20MPa), and the electrode sheet is obtained af...

AI Technical Summary

Problems solved by technology

The advantage of using these methods is that the electroactive material NiO can be directly obtained on the substrate, which effectively avoids the cumbersome steps of mixing and pressing powder materials to prepare electrodes, but there are also the following defects: (1) The electrochemical deposition method requires the process The conditions (such as the voltage used for deposition, current density, etc.) are precisely controlled, and there are problems such as the inability to form a large-scale film and the poor bonding force between the obtained NiO film and the substrate; (2) the NiO film obtained by the sol-gel method is In addition to the defect of poor bonding force, there are also problems such as cracking during the heat treatment of the gel

[0006] Therefore, how to make up for the shortcomings of the existing preparation methods such as complex process, high equipment requirements, and inability to form large-scale films, and overcome the lack of tight bonding between the NiO electrode and the Ni matrix, small specific surface area, low porosity, short service life, and electrochemical For defects such as low activity, it is an important key to realize industrial production to find a Ni-based crystalline NiO electrode material with simple preparation method, high specific surface area, developed pores, firm combination with the substrate, and excellent electrochemical performance.

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