method for synthesizing delta-MnO2 nanosheet array

Abstract

The invention discloses a method for synthesizing a delta-MnO2 nanosheet array. The method comprises the steps that a KMnO4 solution and a KF solution are mixed firstly according to the molar ratio ofKMnO4 to KF being 1:(2-6), and the pH is adjusted to range from 1 to 3 with dilute H2SO4; a substrate material is added, and a hydrothermal reaction is carried out at the temperature of 100 DEG C to140 DEG C; after the reaction is finished, flushing is carried out, and drying is carried out to obtain the delta-MnO2 nanosheet array. According to the method, a one-step hydrothermal method is adopted, and the array material which is ultrathin, free of agglomeration, undamaged in crystal, high in purity and controllable in morphology is prepared; and the process is simple, and energy consumptionis low. The prepared delta-MnO2 material with the nanosheet array morphology evenly grows on a substrate, the morphology is even, agglomeration is avoided, the delta-MnO2 material can be directly adopted as an electrode of various electronic devices, and reduction of the specific surface area of a nano material and reduction of the electrochemical performance due to use of an adhesive, a conductive agent and the like are avoided; and meanwhile the contact surface of the material can be effectively increased through the nanosheet array structure, and the utilization rate of the material is increased.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation and relates to a δ-MnO 2 The preparation method, specifically relates to a kind of δ-MnO 2 Synthesis of nanosheet arrays. Background technique [0002] Due to their specific structures and properties, transition metal oxides have attracted extensive attention in the fields of supercapacitors, ion batteries, and photocatalysis. Among them, MnO 2 Due to its abundant minerals, low cost, simple synthesis method, stable performance and no pollution to the environment, the research is particularly intense. 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, ...

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Problems solved by technology

The above methods all have defects. For example, there are many reaction factors that need to be regulated in the sol-gel method, including the concentration of the precursor solution, pH value, calcination temperature, calcination time, etc. Therefore, the crystal form and morphology of the synthesized powder It is difficult to control, and the calcination process is easy to cause powder agglomeration; the product obtained by electrodeposition has poor crystallinity and low purity

MnO 2 It also has its own problems, such as poor conductivity, and most of them have agglomeration phenomenon, and the material utilization rate is low

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