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  • CoSe2 hollow microspheres, nano-polyhedra and nanorods as pseudocapacitive Mg-storage materials with fast solid-state Mg2+ diffusion kinetics.

CoSe2 hollow microspheres, nano-polyhedra and nanorods as pseudocapacitive Mg-storage materials with fast solid-state Mg2+ diffusion kinetics.

Nanoscale (2019-11-30)
Dong Chen, Yujie Zhang, Xue Li, Jingwei Shen, Zhongxue Chen, Shun-An Cao, Ting Li, Fei Xu
ABSTRACT

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 Co0. 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.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Magnesium bis(hexamethyldisilazide), 97%