Issue 8, 2022

MoS2 nanosheets with expanded interlayer spacing for ultra-stable aqueous Mg-ion hybrid supercapacitor

Abstract

Aqueous magnesium ion supercapacitors (MISs) have attracted attention due to their safety, low cost and environmental friendliness. However, the cycling stability of MISs is usually not ideal due to magnesium ion plating in/stripping from the negative electrode materials. Here, we demonstrate that MoS2 with expanded interlayer spacing (E-MoS2), obtained via a facile method, is a prospective negative electrode material for rechargeable MISs, because the expanded layer spacing reduces ion diffusion resistance and provides more active sites for ion interaction. The specific capacitance of the E-MoS2 electrode (165.6 F g−1) is much higher than that of unmodified MoS2 (79.0 F g−1) at 0.5 A g−1. Importantly, after 30 000 cycles, the E-MoS2-based MIS has an ultralong cycling life with a capacitance retention of 93.8% at 5 A g−1, which is comparable with conventional solid-state capacitors. This strategy provides an effective method to design high-performance electrode material for MISs.

Graphical abstract: MoS2 nanosheets with expanded interlayer spacing for ultra-stable aqueous Mg-ion hybrid supercapacitor

Supplementary files

Article information

Article type
Research Article
Submitted
23 दिसम्बर 2021
Accepted
17 फरवरी 2022
First published
18 फरवरी 2022

Inorg. Chem. Front., 2022,9, 1666-1673

MoS2 nanosheets with expanded interlayer spacing for ultra-stable aqueous Mg-ion hybrid supercapacitor

G. Pan, J. Li, L. Han, W. Peng, X. Xu, T. Lu, M. A. Amin, Y. Yamauchi, M. Xu and L. Pan, Inorg. Chem. Front., 2022, 9, 1666 DOI: 10.1039/D1QI01613J

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