Three-dimensional flower-like MoS2 -CoSe2 heterostructure for high performance superccapacitors

Journal of Colloid and Interface Science
Linxia FangQiangshan Jing

Abstract

A novel three-dimensional (3D) flower-like MoS2-CoSe2 heterostructure has been designed and synthesized by a facile two-step hydrothermal process as the electrode materials for supercapacitors. The MoS2-CoSe2 heterostructure is demonstrated to deliver a high specific capacitance (2577 F g-1 at 1 A g-1) and remarkable rate capability (896 F g-1 at 20 A g-1). Besides, the MoS2-CoSe2 electrode also exhibits excellent cycling stability of 91.03% capacitance retention after 5000 cycles even at a relatively high current density of 20 A g-1. A two-electrode configuration symmetric supercapacitor based MoS2-CoSe2 heterostructure delivers a maximum energy density of 60.5 W h kg-1 at a power density of 800 W kg-1 and the energy density remains at 35.6 W h kg-1 at a power density of 8000 W kg-1. Excellent cycling stability is also achieved with 83.62% retention after 2000 charge-discharge cycles, revealing its potential and viability for practical applications. The outstanding electrochemical performances of the fabricated electrode stem from the unique structure characteristic of the flower-like MoS2-CoSe2 heterostructure. The high-quality heterointerface facilitates electron conduction while the porosity not only allows fast ion transpo...Continue Reading

Citations

Apr 22, 2020·ACS Nano·Jialu ChenMichael A Pope

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