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Senthilkumar, V.,Kadumudi, F.B.,Ho, N.T.,Kim, J.W.,Park, S.,Bae, J.S.,Choi, W.M.,Cho, S.,Kim, Y.S. Elsevier Sequoia 2016 Journal of Power Sources Vol.303 No.-
The present work focuses on the development of template-free mesoporous NiO nanoarrays with large surface area grown on 3D nickel foam networks by a seed mediated aqueous chemical growth technique and subsequent annealing process. The resultant binder-free, well-aligned and vertically grown NiO nanoarrays exhibits a micron-sized planar structure as well as an ultrathin thickness (~7 nm). The unique surface and electronic structure facilitates surface-dependent electrochemical reaction processes with no dead volume. They deliver a high capacitance of 2065 F g<SUP>-1</SUP> at a current density of 16 A g<SUP>-1</SUP> as a three electrode system. A specific capacitance of 1247 F g<SUP>-1</SUP> is maintained at a higher current rate of 70 A g<SUP>-1</SUP> with 88.9% retention after 5000 cycles. Finally, in a solid-state asymmetric supercapacitor configuration using NiO//activated carbon, the device delivers an enhanced supercapacitive performance, with an energy density of 43.5 Wh kg<SUP>-1</SUP> and power density of 2.1 kW kg<SUP>-1</SUP>. Thus, the current research paves the way for the use of NiO nanoarrays as an electrode material for practical supercapacitor devices with higher cycling retention and rate capacity.