Abstract
Nickel hydroxide is a remarkable battery-like material for supercapacitors. However, it often suffers from low actual capacity and inferior cyclic performance. Herein, we introduce a surface oxidation route to prepare coaxial α-nickel hydroxide@nickel oxide nanowires (α-NHO@NO NWs) from α-nickel hydroxide nanowires (α-NHO NWs) obtained by hydrothermal synthesis. The α-NHO@NO NWs have a large specific surface of 85.4 m2 g−1 with hierarchical mesopores. Compared to α-NHO NWs, the energy storage capacity of α-NHO@NO NWs is significantly enhanced. In a 3-electrode system, the α-NHO@NiO NWs delivered 551.8 C g−1 at 0.25 A g−1. In addition, an assembled α-NHO@NO//AC hybrid supercapacitor (HSC) provided a solid gravimetric capacity of 95.6 F g−1 at 0.5 A g−1, exceptional rate capability, and robust cyclic performance (80.4 % retention after 15,000 cycles). The α-NHO@NO//AC device supplied 34.0 Wh kg−1 at 400 W kg−1 and 20.1 Wh kg−1 at 8000 W kg−1. In addition, a homemade α-NHO@NO//AC device successfully powered a micro-fan, demonstrating its potential for real-world applications. The outstanding charge storage capability of α-NHO@NO NWs can be attributed to their unique coaxial nanowire-like structure, large specific surface, and hierarchical mesopores.
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