Facile synthesis of hierarchical CoMoO4@NiMoO4 core–shell nanosheet arrays on nickel foam as an advanced electrode for asymmetric supercapacitors†
Abstract
Hierarchical CoMoO4@NiMoO4 core–shell nanosheet arrays were successfully grown on nickel foam via a facile two-step hydrothermal method followed by calcination treatment. With an ordered core–shell nanostructure and a desired composition, the optimized CoMoO4@NiMoO4 composite electrode exhibited a high specific capacitance of 1639.8 F g−1 (3.30 F cm−2) and an excellent cycling stability with a 95% retention rate at a high current density of 20 mA cm−2 after 3000 cycles. Additionally, an asymmetric supercapacitor (ASC) was assembled with CoMoO4@NiMoO4 nanosheet arrays/Ni foam as the positive electrode and activated carbon (AC) as the negative electrode, which displayed an energy density of 28.7 W h kg−1 at a power density of 267 W kg−1. The remarkable electrochemical performance indicated that the CoMoO4@NiMoO4 composite was a promising electrode material and had great application potential for energy storage.
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