Journal
NANOSCALE
Volume 11, Issue 34, Pages 16043-16051Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr04280f
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Funding
- National Natural Science Foundation of China [51402113, 21403305]
- Fundamental Research Funds for the Central Universities
- Open Fund of Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission
- Ministry of Education
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Rechargeable Mg batteries are promising candidates for highly safe large-scale energy storage batteries owing to their low-cost and non-dendritic metallic Mg anode. However, exploration of high-performance cathodes remains a great challenge hindering their development. Herein, a new pseudocapacitive Mg-storage nanowire material (a-MoS3@CNT) is constructed with a carbon nanotube (CNT) core and an amorphous MoS3 (a-MoS3) outer layer (15 nm thick). The nanowire cathode exhibits a high reversible capacity of 175 mA h g(-1) at 100 mA g(-1), a good rate performance of 50 mA h g(-1) at 1000 mA g(-1), and an outstanding long-term cyclability over 500 cycles. Further investigation of the mechanism demonstrates that the Mg-storage of a-MoS3@CNT is mainly achieved by the pseudocapacitance of a-MoS3, in which Mg2+ ions show fast solid-state diffusion kinetics. The present results demonstrate a new approach for efficient Mg-storage using pseudocapacitive materials, and the performance and solid-state Mg2+ diffusion kinetics could be optimized by delicate morphology tailoring.
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