Method for preparing MnO2 film with multi-layer structure

Abstract

The invention discloses a method for synthesizing a MnO2 film with a multi-layer structure on a metal manganese substrate by using permanganate, deionized water and hydrochloric acid as raw materials and adopting a hydro-thermal method. The method is characterized in that the layer structure of the film is controllable; the MnO2 film with a two-layer structure or a three-layer structure can be obtained through regulating a synthetic condition, and the film thickness can be changed from several microns to dozens of microns; the film is provided with a porous loose structure, and each layer of the film comprises nanometer slices in different sizes which are arrayed vertically to the substrate; and the diameters of ducts formed by the nanometer slices can be from dozens of nanometers to hundreds of nanometers in variety. The metal manganese substrate achieves an obvious guiding effect over the growth of the film, so the growth of the film is facilitated and the increase of the binding force of the film and the substrate is also facilitated. The method has a simple process, the cost is low, industrialization is easy to realize, and meanwhile, an obtained product has a novel structure and has a potential of being used as a super capacitor electrode material.

Description

technical field [0001] The invention relates to a method for hydrothermally preparing a multilayer structure manganese dioxide film on a metal manganese substrate, which belongs to the technical fields of chemical industry, material science and engineering. Background technique [0002] Manganese dioxide has the advantages of being cheap, non-toxic and environmentally friendly, and can be widely used in various fields, such as catalysis, magnetic materials and electrode materials. The crystal structure of manganese dioxide is special, which is composed of [MnO 6 ] octahedrons are formed by sharing the top or sharing the edges, and can specifically form (1×1), (1×2), (2×2) and other forms of channel structures, and can also form (1×∞), (2×∞) and other layered structures can form a three-dimensional network structure. Different crystal structures correspond to numerous crystal forms of manganese dioxide, such as α, β, γ, δ, ε, λ and so on. The unique pore, layered or three-...

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Problems solved by technology

In the above related studies, although MnO has been successfully prepared 2 thin film materials, but failed to achieve effective control over the structure of the prepared thin film materials

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