Issue 1, 2019

A novel MnO2/MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance

Abstract

MXene is a new 2D transition metal carbide possessing metallic conductivity and hydrophilic surfaces. It has drawn widespread attention as a potential material for electrode use. However, the applications of MXene are limited by its property of low electrical capacity. In this paper, a novel MnO2/MXene composite is prepared by electrostatic self-assembly. Firstly, delaminated MnO2 nanosheets are obtained through the intercalation delamination of multilayered H-MnO2 in a cationic Gemini surfactant (Gem) solution, leading to a positively charged surface. Then, the positive MnO2 nanosheets are assembled on negative MXene nanosheets through electrostatic self-assembly to form a MnO2/MXene composite. The characterization results show that the MnO2 nanosheets are intimately assembled on the MXene nanosheets. As an electrode material, the MnO2/MXene composite displays a specific capacitance of 340 F g−1 at 1 A g−1, which is three times the performance of an MXene electrode. In addition, the MnO2/MXene electrode shows a high retention rate (90.3% retention at 10 A g−1) and good cycling life (87.6% of the initial specific capacitance is retained after 2000 cycles at 4 A g−1). The properties of the proposed composite are attributed to the excellent conductivity of MXene and the high specific capacitance of MnO2.

Graphical abstract: A novel MnO2/MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance

Supplementary files

Article information

Article type
Research Article
Submitted
07 Sep 2018
Accepted
16 Nov 2018
First published
19 Nov 2018

Inorg. Chem. Front., 2019,6, 199-208

A novel MnO2/MXene composite prepared by electrostatic self-assembly and its use as an electrode for enhanced supercapacitive performance

S. Chen, Y. Xiang, W. Xu and C. Peng, Inorg. Chem. Front., 2019, 6, 199 DOI: 10.1039/C8QI00957K

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