delta-mno 2 Synthesis of Nanosheet Arrays

Abstract

The invention discloses a δ-MnO 2 Synthesis of nanosheet arrays. The method according to KMnO 4 The molar ratio of KMnO to KF is 1:2~6, KMnO 4 solution and KF solution mixed with dilute H 2 SO 4 Adjust the pH to 1-3, add the base material, and conduct a hydrothermal reaction at 100°C-140°C. After the reaction, wash and dry to obtain δ‑MnO 2 Nanosheet arrays. The invention adopts a one-step hydrothermal method to prepare an ultra-thin, non-agglomerated, well-crystallized, high-purity, and controllable array material with simple process and low energy consumption. The prepared nanosheet array morphology δ‑MnO 2 The material grows evenly on the substrate, with uniform appearance and no agglomeration. In later applications, it can be directly used as electrodes of various electronic devices, avoiding the reduction of the specific surface area of ​​nanomaterials caused by the use of adhesives and conductive agents. As well as the reduction of electrochemical performance, at the same time, the nanosheet array structure can effectively increase the contact surface of the material and improve the utilization rate of the material.

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, ...

AI Technical Summary

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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