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In suit growth of V-shaped CoSe_2 on graphene for high performance flexible all-solid-state supercapacitors

Yuanhua Xiao  Xiaobing Zhao  Dangcheng Su  Shide Wu  Liming Zhou  Shaoming Fang  
【摘要】:We present a facile one-step solvothermal approach for in situ growth of V-shaped CoSe2 nanorods on the graphene(GR) sheets without adding any surfactant. When acting as an electrochemical supercapacitor electrode material, the CoSe2@GR delivers a highly improved specific capacitance. Flexible all-solid-state asymmetric supercapacitor devices based on these CoSe2@GR and PVA/KOH gel electrolyte showed a long-term cycling ability with a high-energy density(66.35 Wh kg-1 at 850.0 W kg-1) and a high-power density(27.2 kW kg-1 at 30.22 Wh kg-1).

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