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ZIFs Derived Multiphase CoSe2 Nanoboxes Induced and Fixed on CoAl-LDH Nanoflowers for High-performance Hybrid Supercapacitor
Chemical Engineering Science  (IF4.311),  Pub Date : 2021-11-23, DOI: 10.1016/j.ces.2021.117241
Lin Sun, Yu Liu, Ming Yan, Weijing Liu, Xiaoying Liu, Weidong Shi

Reasonable structures are beneficial to improve the electronic transfer efficiency of the electrode. A novel two/three-dimensional structure with multiphase CoSe2 (M-CoSe2) nanoboxes fixed on CoAl-LDH nanoflowers on carbon paper (CP) is reasonably designed. The formation mechanism of M-CoSe2 is systematically studied through the gradient change of the selenization conditions. Benefitting from the hollow structure of the ZIFs derivatives (carbon-nitrogen frameworks, CNFs), numerous charge transfer channels are provided. Furthermore, M-CoSe2 with enhanced conductivity can furnish abundant active sites and a synergistic effect. The specific capacity of the optimal anode M-CoSe2/CNFs/CoAl-LDO/CP can reach 343.6 mAh g-1 at 1 A g-1, which is equivalent to twice that of the monomer material. The hybrid-supercapacitor (M-CoSe2/CNFs/CoAl-LDO/CP//activated carbon) can provide a high energy density of 50.8 Wh kg-1 at 800 W kg-1, and high stability (capacity loss rate of 3.2%, 10,000 cycles). Besides, LEDs can be lit by HSCs, demonstrating their application potential.