Issue 2, 2024

Enhanced hydrogen evolution and symmetric supercapacitor performance of a Ru-doped multiphase WS2 electrode

Abstract

It is well known that the electrochemical energy generation and storage performance of two-dimensional layered transition metal dichalcogenides (for example, MoS2 and WS2) strongly depend on the phase and properties of the electrode material. In this work, we report that 2H/1T phase coupling induced by Ru doping leads to improved electrochemical symmetric supercapacitor and hydrogen evolution reaction (HER) performance of a WS2 nanosheet electrode. XRD and Raman studies indicate that a 2H/1T multiphase emerges in WS2 nanosheets for the sample with 10 at% Ru (2H/1T-WS2-10) and other samples retain the parent 2H phase at a low Ru doping level. The 2H/1T-WS2-10 electrode with excellent catalytic activity delivers a 113 mV overpotential at a 10 mA cm−2 current density in 0.5 M H2SO4 electrolyte. Furthermore, the same electrode exhibits superior symmetric supercapacitor performance with high specific capacitance (664 F g−1@1 A g−1) and energy density (92 W h kg−1@1 A g−1) in 1 M Na2SO4 electrolyte. This work opens the way for the multifunctional use of doped WS2 for electrochemical energy conversion and storage applications.

Graphical abstract: Enhanced hydrogen evolution and symmetric supercapacitor performance of a Ru-doped multiphase WS2 electrode

Supplementary files

Article information

Article type
Paper
Submitted
26 Oct 2023
Accepted
23 Nov 2023
First published
24 Nov 2023

J. Mater. Chem. A, 2024,12, 961-967

Enhanced hydrogen evolution and symmetric supercapacitor performance of a Ru-doped multiphase WS2 electrode

P. Siva and K. Vasu, J. Mater. Chem. A, 2024, 12, 961 DOI: 10.1039/D3TA06541C

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