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Design and synthesis of K-doped tremella-like δ-MnO2 for high-performance supercapacitor by Xingshuai Zhang; Feng Zhang; Danyang Wei; Ziyi Cai; Yu Song; Xiuying Wang is a Engineering article available to read on EtoBox.

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The development of K-doped δ-MnO 2 is an effective strategy to achieve a significant improvement in capacitance for MnO 2 -based supercapacitors. In this paper, we prepared a series of K-doped δ-MnO 2 through the redox reaction between KMnO 4 and MnCl 2 ⋅4H 2 O with the assistance of KOH and acetone. The morphology and K content can be easily controlled by adjusting the amount of MnCl 2 ⋅4H 2 O. The optimal sample not only has a tremella-like structure assembled from leaf-like nanosheets but also has the highest K content. This fascinating structure has following advantages: 1) The two-dimensional nanosheets can provide a large surface (specific surface area of 92.7 m 2 g -1 ) for ion adsorption and ion diffusion; 2) The three-dimensional structure can avoid the accumulation of nanosheets, and its robust structure is difficult to be destroyed, which is conducive to improving cycling stability. Combining the advantages of the presence of large amounts of K + , i.e., the significant increase in electrical conductivity and ion intercalation sites, the sample exhibited superior electrochemical performance, such as the specific capacitance of 726.0 and 283.7 F g -1 at 1.0 A g -1 in KOH

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Author

Xingshuai Zhang; Feng Zhang; Danyang Wei; Ziyi Cai; Yu Song; Xiuying Wang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)