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Nano Research 2020, 13(10): 2763-2769 https://doi.org/10.1007/s12274-020-2925-3
Research Article | Open Access | Issue | Published: 05 October 2020

Edge-enriched MoS2 for kinetics-enhanced potassium storage

Show Author's Information 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
Keywords:
molybdenum disulfide, kinetics, enriched edges, potassium-ion batteries
Topics:
Ion batteriesKinetics Layered semiconductorsLithiumMolybdenum compoundsPotassium
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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
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Abstract Full text Electronic supplementary material About this article

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.


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Electronic supplementary material
About this article

Edge-enriched MoS2 for kinetics-enhanced potassium storage

Show Author's information 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

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 disulfide, kinetics, enriched edges, potassium-ion batteries

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Publication history

Received: 03 May 2020
Revised: 07 June 2020
Accepted: 08 June 2020
Published: 05 October 2020
Issue date: October 2020

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© The Author(s) 2020

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 51972270, 51702262, 51872240, 51911530212, and 51672225), the Natural Science Foundation of Shaanxi Province (No. 2020JZ-07), the Key Research and Development Program of Shaanxi Province (No. 2019TSLGY07-03), the Fundamental Research Funds for the Central Universities (Nos. 3102019JC005 and 3102019ghxm004), the Research Fund of the State Key Laboratory of Solidification Processing (NPU), China (2019-QZ-03), and the Top International University Visiting Program for Outstanding Young Scholars of Northwestern Polytechnical University. We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for XPS characterizations. G. J. acknowledges the sponsorship from China Scholarship Council (CSC). H. W. acknowledges the support from the 1000 Youth Talent Program of China. F. X. acknowledges support by the Alexander von Humboldt Foundation.

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