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Three-dimensional porous NiO/Ni(OH) 2 composites consisting of NiO nanoparticles and amorphous Ni(OH) 2 nanosheets were prepared successfully for supercapacitors. NiO nanoparticles were dispersed uniformly among Ni(OH) 2 nanosheets. The capacitance of the composites reached 1375.45 F g −1 at 0.5A g −1 , which was much higher than that of pure NiO and Ni(OH) 2 . After 1000 cycles, 95.5% of the capacitance of composites was retained. Moreover, an NiO/Ni(OH) 2 -2//AC device was fabricated and exhibited a prominent energy density of 28.5 Wh kg −1 at a power density of 450 W kg −1 and even 13.8 Wh kg −1 at 2258.2 W kg −1 . A light-emitting diode can easily be lit using the device, demonstrating its application. The enhanced capacitance performance of the NiO/Ni(OH) 2 hierarchical structure was ascribed to its tremendous surface area and amorphous characteristics.

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