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Research Article | Open Access

Edge-enriched MoS2 for kinetics-enhanced potassium storage

Guangshen Jiang1, Xiaosa Xu1, Haojie Han1, Changzhen Qu1, Hlib Repich1, Fei Xu1,2( ), Hongqiang Wang1( )
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Shaanxi Joint Laboratory of Graphene (NPU), Northwestern Polytechnical University, Xi’an 710072, China
Department of Inorganic Chemistry, Technische Universität Dresden, Bergstrasse 66, 01062 Dresden, Germany
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Graphical Abstract

Abstract

Potassium-ion batteries (PIBs) hold great promise as alternatives to lithium ion batteries in post-lithium age, while face challenges of slow reaction kinetics induced by the inherent characteristics of large-size K+. We herein show that creating sufficient exposed edges in MoS2 via constructing ordered mesoporous architecture greatly favors for improved kinetics as well as increased reactive sites for K storage. The engineered MoS2 with edge-enriched planes (EE-MoS2) is featured by three-dimensional bicontinuous frameworks with ordered mesopores of ~ 5.0 nm surrounded by thin wall of ~ 9.0 nm. Importantly, EE-MoS2 permits exposure of enormous edge planes at pore walls, renders its intrinsic layer spacing more accessible for K+ and accelerates conversion kinetics, thus realizing enhanced capacity and high rate capability. Impressively, EE-MoS2 displays a high reversible charge capacity of 506 mAh·g-1 at 0.05 A·g-1, superior cycling capacities of 321 mAh·g-1 at 1.0 A·g-1 after 200 cycles and a capacity of 250 mAh·g-1 at 2.0 A·g-1, outperforming edge-deficient MoS2 with nonporous bulk structure. This work enlightens the nanoarchitecture design with abundant edges for improving electrochemical properties and provides a paradigm for exploring high-performance PIBs.

Keywords

molybdenum disulfideenriched edgespotassium-ion batterieskinetics

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Nano Research
Volume 13 Issue 10,
October 2020
Pages 2763-2769
DOI: 10.1007/s12274-020-2925-3
Cite this article:
Jiang G, Xu X, Han H, et al. Edge-enriched MoS2 for kinetics-enhanced potassium storage. Nano Research, 2020, 13(10): 2763-2769. https://doi.org/10.1007/s12274-020-2925-3
Topics:
Ion batteriesKinetics Layered semiconductorsLithiumMolybdenum compoundsPotassium

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Received: 03 May 2020
Revised: 07 June 2020
Accepted: 08 June 2020
Published: 05 October 2020
© The Author(s) 2020

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