Issue 47, 2017

Hierarchical nanotubes constructed from interlayer-expanded MoSe2 nanosheets as a highly durable electrode 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 a result of oriented attachment and Ostwald ripening effects. As a robust sodium host material, the MoSe2 nanotubes featuring hierarchical organization, hollow interiors, and 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) preserving structural and morphological stability, and (iv) improving electronic conductivity by in situ carbon modification. By controlling the cut-off voltage in the 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 mA h g−1 after 1500 cycles at a high current density of 1000 mA g−1. This work demonstrates the best cycling performance to date of MoSe2-based anodes for SIBs.

Graphical abstract: Hierarchical nanotubes constructed from interlayer-expanded MoSe2 nanosheets as a highly durable electrode for sodium storage

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2017
Accepted
08 Nov 2017
First published
09 Nov 2017

J. Mater. Chem. A, 2017,5, 24859-24866

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

J. Zhang, M. Wu, T. Liu, W. Kang and J. Xu, J. Mater. Chem. A, 2017, 5, 24859 DOI: 10.1039/C7TA08538A

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