Coralline porous delta-MnO2 and preparation method thereof

Abstract

The invention relates to a preparation method of MnO2, in particular to coralline porous delta-MnO2 and a preparation method thereof. The preparation method includes the following steps that KMnO4 is added into deionized water, and the materials are stirred to be uniform; MnSO4 is added into deionized water, the materials are stirred to be uniform, and the two solutions are mixed to be uniform; the pH value of the mixed solution is adjusted with diluted hydrochloric acid; the mixed solution with the pH value adjusted is transferred into a high-pressure reaction still; after the reaction of the high-pressure reaction still, cooling is carried out, the obtained product is washed with distilled water to be neutral and then washed with absolute ethyl alcohol, the product is dried through an oven, and coralline porous delta-MnO2 powder is obtained. The preparation method is achieved through a hydrothermal method, no high-temperature calcination is needed by the hydrothermal method, the superfine powder material without clusters or with fewer clusters and with complete crystallization and controllable shapes can be prepared, the process is simple, efficiency is high, and the course is controllable; in addition, the obtained product is complete in crystal phase development and high in purity.

Description

technical field [0001] The present invention relates to MnO 2 The preparation method of, especially relates to a coral-like porous δ-MnO 2 and its preparation method. Background technique [0002] MnO 2 There are many different types of crystal structures, which are represented by [MnO 6 ] octahedron as the basis, O atoms are distributed on the corners of the octahedron, and Mn atoms are located in the center of the octahedron. The vertices, edges or faces of these octahedra are connected in different forms to form different crystal forms. Common crystal forms include α, β, γ, λ, and δ crystal forms. MnO 2 The synthesis cost is low, the performance is stable, and it is non-polluting to the environment. It is currently receiving high attention in the fields of supercapacitors, lithium-ion batteries, and photocatalysis. [0003] MnO 2 The preparation methods of powder mainly include liquid phase precipitation method, sol-gel method, solid phase reaction method and so on...

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Problems solved by technology

[0004] However, the liquid-phase precipitation method must be separated from the liquid-solid to obtain the precipitate, because SO 4 2- or Cl - The introduction of a large number of inorganic ions, such as, need to be washed repeatedly to remove these ions. There are disadvantages such as long process flow, large waste liquid, and large product loss. It is difficult to completely clean the inorganic ions. Therefore, the prepared MnO 2 The purity of the powder is not high; there are many reaction factors to be regulated in the sol-gel method, including the concentration of the precursor solution, pH value, calcination temperature, calcination time, etc., so the synthesized MnO 2 The crystal form and morphology of the powder are difficult to control, and the calcination process is easy to cause the agglomeration of the powder; the powder obtained by the solid-state reaction method is easy to agglomerate, and the shape is difficult to control

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