Journal
NANOSCALE
Volume 11, Issue 48, Pages 23173-23181Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr07852e
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Funding
- Hubei Provincial Natural Science Foundation [2019CFB452, 2019CFB620]
- National Natural Science Foundation of China [51402113, 21403305]
- Innovation Group of the Hubei Natural Science Foundation [2018CFA023]
- Fundamental Research Funds for the Central Universities
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CoSe2 materials with different nanostructures are used as pseudocapacitive Mg-storage cathodes, which exhibit fast solid-state Mg2+ ions diffusion kinetics. In this work, CoSe2 with different nanostructures including hollow microspheres (H-CoSe2), nano-polyhedra (P-CoSe2) and nanorods (R-CoSe2) are fabricated by using facile one-step hydrothermal methods, and used as pseudocapacitive electrodes for rechargeable Mg batteries. It is observed that R-CoSe2 exhibits the highest reversible capacity of 233 mA h g(-1) at 50 mA g(-1) and an excellent rate capability of 116 mA h g(-1) at 500 mA g(-1), ascribing to the 1D nanorod structure which facilitates the solid-state Mg2+ diffusion. Benefitting from the stable hierarchical structure, H-CoSe2 exhibits a superior long-term cycling stability of 350 cycles. A mechanism study indicates that the redox reaction reversibly occurs between CoSe2 and metallic Co-0. Further investigation demonstrates that the fast solid-state Mg2+ diffusion kinetics and surface-controlled pseudocapacitive behavior enhance the electrochemical performance. This work highlights a novel and efficient Mg-storage strategy of using pseudocapacitive materials, and the performance and solid-state Mg2+ diffusion kinetics of CoSe2 could be optimized by rational structural tailoring.
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