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Hierarchical nanotubes constructed from interlayer-expanded MoSe2 nanosheets as highly durable electrodes for sodium storage

Abstract

Sodium-ion batteries (SIBs) are considered as a promising energy storage device, but suffer from poor cycling performance. In this work, hierarchical MoSe2 nanotubes have been synthesized for the first time and demonstrated as a highly-durable electrode material of SIBs. The hierarchical nanotubes consist of few-layered MoSe2 nanosheets with an expanded (002) interlayer spacing of 1.00 nm (54.8% expansion). The growth of hierarchical nanotubes is resulted from the oriented attachment and Ostwald ripening effects. As a robust sodium host material, the MoSe2 nanotubes featuring hierarchical organization, hollow interior, interlayer expansion are beneficial for: (i) lowering diffusion energy barriers and facilitating fast Na+ insertion/extraction reaction kinetics, (ii) accommodating volume changes upon sodiation/desodiation, (iii) reserving structure and morphology stability, and (iv) improving electronic conductivity by in-situ carbon modification. By controlling the cut-off voltage range of 0.5–3.0 V with an intercalation mechanism, the MoSe2 nanotube electrode shows highly stable cycling performance and delivers a reversible discharge capacity of 228 mAh g−1 after 1500 cycles at a high current density of 1000 mA g−1. This work demonstrates the best cycling performance of MoSe2–based anodes for SIBs to date.

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Publication details

The article was received on 27 Sep 2017, accepted on 08 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08538A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Hierarchical nanotubes constructed from interlayer-expanded MoSe2 nanosheets as highly durable electrodes for sodium storage

    J. Zhang, M. Wu, T. Liu, W. Kang and J. Xu, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08538A

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