Issue 4, 2023

Time-dependent exfoliation study of MoS2 for its use as a cathode material in high-performance hybrid supercapacitors

Abstract

Quick and precise exfoliation of bulk molybdenum sulphide into few layers can bring a quantum leap in the electrochemical performance of this material. Such a cost-effective exfoliation route to obtain few layers of MoS2 nanosheets with a high mass yield of ∼75% is presented in this study. The electrochemical behaviours of three types of samples, namely pristine MoS2 and MoS2 exfoliated for 3 h and 5 h, were compared and the reasons leading to their performance modulation are explained. The performance could be tuned by changing the nature of the electrolytes, as shown using three different electrolytes, i.e. H2SO4, Na2SO4, and KOH. The electrochemical performance of a supercapacitor device fabricated using the 5 h-exfoliated sample showed many fold improvement. The strategy of combining with a 2D material-based anode is an interesting way forward for such devices. In addition, the anode material has to be carefully chosen so that high performance can be ensured. The usefulness of 2D flake-like WO3 as an anode was investigated first before establishing its worthiness in a hybrid device. The hybrid device was able to deliver an excellent energy density of 33.74 W h kg−1 with long-term cycling stability and coulombic efficiency, thus proving its applicability for high-performance energy-storage devices.

Graphical abstract: Time-dependent exfoliation study of MoS2 for its use as a cathode material in high-performance hybrid supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
15 Nov 2022
Accepted
06 Jan 2023
First published
10 Jan 2023
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2023,5, 1172-1182

Time-dependent exfoliation study of MoS2 for its use as a cathode material in high-performance hybrid supercapacitors

S. Priya, D. Mandal, A. Chowdhury, S. Kansal and A. Chandra, Nanoscale Adv., 2023, 5, 1172 DOI: 10.1039/D2NA00807F

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