MXene supported transition metal nanoparticles accelerate sulfur reduction reaction kinetics

Abstract

Although tremendous efforts have been made to prevent the dissolution of lithium polysulfide (LiPS) intermediates in Li–S batteries, the sluggish sulfur reduction reaction (SRR) is still less addressed. Here, we develop a class of MXene-supported transition metal nanoparticle (TMNPs@MXene) composites as highly efficient SRR catalysts for Li–S batteries. The MXene support with high conductivity and high affinity to LiPS can effectively activate TMNP catalysts. TMNPs homogeneously dispersed on MXene sheets are the catalytically active sites for the SRR. Among all TMNPs@MXene composites, the CoNPs@MXene composite exhibits the highest SRR electrocatalytic activity, as confirmed by the fast Li+ diffusion, high Li2S deposition capacity, large electron transfer number, and low activation energy. Consequently, the CoNPs@MXene/S cathode-based Li–S cell exhibits higher capacity and rate capability without obvious capacity decay. Theoretical calculations reveal the moderate LiPS adsorption strength and the low Gibbs energy barrier of the rate-limiting Li2S2/Li2S conversion, which account for the excellent SRR activity of the CoNPs@MXene composite. This novel SRR catalyst provides an opportunity for fabricating long-life and high-energy Li–S batteries.

Graphical abstract: MXene supported transition metal nanoparticles accelerate sulfur reduction reaction kinetics

Supplementary files

Article information

Article type
Paper
Submitted
12 Mar 2022
Accepted
23 May 2022
First published
23 May 2022

J. Mater. Chem. A, 2022, Advance Article

MXene supported transition metal nanoparticles accelerate sulfur reduction reaction kinetics

Z. Hu, Z. Liu, B. Huang, Y. Gao, F. Song, H. A. Younus, X. Wang and S. Zhang, J. Mater. Chem. A, 2022, Advance Article , DOI: 10.1039/D2TA01961B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements