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Here we report the extraordinary electrochemical energy storage capability ofNiMoO4@NiMoO4 homogeneous hierarchical nanosheet-on-nanowire-arrays (SOWAs)synthesized on nickel substrate by a two-stage hydrothermal process.Comparatively speaking, the SOWAs electrode displays improved electrochemicalperformances than the bare NiMoO4 nanowire arrays. Such improvements can beascribed to the characteristic homogeneous hierarchical structure which notonly effectively increases the active surface areas for fast charge transfer,but also reduces the electrode resistance significantly by eliminating thepotential barrier at the nanowire/nanosheet junction, which is usually an issuein other reported heterogeneous architectures. We further evaluate theperformances of the SOWAs by constructing an asymmetric hybrid supercapacitor(ASC) with the SOWAs and activated carbon (AC). The optimized ASC showsexcellent electrochemical performances with 47.2 Wh/kg in energy density at1.38 kW/kg at 0-1.2 V. Moreover, the specific capacity retention can be as highas 91.4% after 4000 cycles, illustrating the remarkable cycling stability ofthe NiMoO4@NiMoO4//AC ASC device. Our results show that this uniqueNiMoO4@NiMoO4 SOWAs display great prospect for future energy storageapplications

Homogeneous hierarchical NiMoO4@NiMoO4 nanostructure as a high-performance anode material for electrochemical energy storage