Preparation method of NiO porous membrane

Abstract

The invention discloses a preparation method of NiO porous membrane. According to the invention, first, an Ni substrate is pretreated; the pretreated Ni substrate is adopted as an anode, a Pt sheet is adopted as a cathode, a nitric acid solution is adopted as an electrolyte, and an anodic oxidation treatment is carried out for 5min to 30min with an applied voltage of 5V to 25V while the electrolyte is stirred; the Ni substrate processed from the anodic oxidation treatment is washed with deionized water, and is naturally dried in air, such that an Ni substrate with an amorphous NiO porous membrane is obtained; the Ni substrate with the amorphous NiO porous membrane is baked in a muffle furnace, such that an Ni-based crystalline cubic phase NiO porous membrane is obtained. According to the invention, no obvious boundary is between the NiO porous membrane and the substrate material which is the Ni substrate; and bonding strength between the two is high. NiO porous membranes produced withother methods have problems of deformation, efflorescence and peeling during long-term use. With the method provided by the invention, the problems are solved, and the cycling stability of the product is improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a method for preparing a NiO porous film. Background technique [0002] Nano-NiO is an important inorganic functional material, which shows extremely broad application prospects in the fields of ceramics, thermosensitive elements, catalysts, magnetic materials, electrochromic materials, gas sensors, supercapacitors, etc. Among them, in some application fields (such as gas sensors and supercapacitors), nano-NiO exists in the form of thin films. In recent years, the controllable construction of nano-NiO porous films has attracted extensive attention of researchers. This is attributed to the enhanced function of nanoporous membranes due to their well-developed pore structure and higher specific surface area compared with dense membranes with the same chemical composition. [0003] So far, the methods reported in the literature for the preparation ...

AI Technical Summary

Problems solved by technology

The advantage of the electrochemical deposition method is that it is easy to form a large-area film. The composition of the film can be controlled by controlling the potential (or current) and solution composition. The thickness and surface morphology of the film can also be controlled by controlling the electric charge during deposition. The main disadvantages are: (1) Since the formed film contains more water, it is usually loose and has poor bonding with the substrate; (2) The process conditions require very precise and harsh

The process of preparing porous NiO thin films by sol-gel method is relatively mature, and it is usually realized with the assistance of a template (hard template or soft template). Equipment and equipment, but it has the following defects: (1) the process flow is long and the steps are cumbersome; (2) the product is prone to cracking during the heat treatment of the gel; (3) organic solvents are often used or high-temperature roasting is used to remove the template, However, the residual impurities introduced by incomplete demolding will cause the performance of NiO porous film to deteriorate during use. On the one hand, the use of a large amount of organic reagents is not friendly to the environment, on the other hand, it will cause high manufacturing costs, and high-temperature roasting is easy to demold The NiO grains that make up the film grow abnormally, resulting in a sharp decrease in the specific surface area of ​​the film