Dong, H;
Xu, Y;
Zhang, C;
Wu, Y;
Zhou, M;
Liu, L;
Dong, Y;
... Lei, Y; + view all
(2018)
MoS₂ nanosheets with expanded interlayer spacing for enhanced sodium storage.
Inorganic Chemistry Frontiers
, 5
(12)
pp. 3099-3105.
10.1039/c8qi00969d.
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Abstract
Sodium-ion battery technology is a promising alternative to lithium-ion batteries for low-cost and large-scale energy storage applications. The larger size of the Na-ion relative to the Li-ion imposes kinetic limitations and often results in sluggish Na-ion diffusion. It is a great necessity to explore prominent structural features of materials to overcome the limitations and improve the diffusion. Layered MoS2 has an ideal two-dimensional diffusion pathway because of the weak van der Waals interaction between the layers. However, the limited gallery height of 0.3 nm is insufficient to achieve fast Na-ion diffusion. A facile hydrothermal route at medium-ranged temperatures is reported in this work to obtain interlayer expanded MoS2 nanosheets. The interlayer spacing is greatly expanded to 1 nm and facilitates Na-ion insertion and extraction in the van der Waals gaps. The nanosheet morphology shortens the Na-ion diffusion distance from the lateral side. The interlayer expanded MoS2 nanosheets are used as sodium-ion battery anodes in the voltage window of 0.5–2.8 V, where intercalation reaction contributes to Na storage and the layered structure can be preserved. The nanosheets exhibit a high cycling stability by retaining 92% of the initial charge capacity after 100 cycles and a great rate capability of 43 mA h g−1 at 2 A g−1. Kinetics study reveals a significant alleviation of diffusional limitation, verifying the improved Na-ion diffusion and enhanced Na storage. The presented work explores the utilization of the van der Waals gaps to store ions and sheds light on designing two-dimensional materials in other energy systems.
| Type: | Article |
|---|---|
| Title: | MoS₂ nanosheets with expanded interlayer spacing for enhanced sodium storage |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/c8qi00969d |
| Publisher version: | https://doi.org/10.1039/c8qi00969d |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076119 |
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