Fabrication of β-Ni(OH)2 ∥ γ-Fe2O3 nanostructures for high-performance asymmetric supercapacitors

In this study, we have fabricated a novel beta-Ni(OH)(2) hierarchical nanostructures (HNs) a gamma-Fe2O3 nanohexagons (NHs) and investigated their potential as electrode material for high-performance asymmetric supercapacitor. The X-ray diffraction and transmission electron microscopy analyses confirmed the presence of beta-Ni(OH)(2) and gamma-Fe2O3 in the obtained products. The electrochemical performance of single electrodes containing beta-Ni(OH)(2) HNs and gamma-Fe2O3 NHs supported on the nickel foam exhibited high specific capacitances of 3232.08 and 1800.06 F g(-1) at the current densities of 3 and 13 mA cm(-2), respectively. As a result, we have fabricated an asymmetric supercapacitor device using beta-Ni(OH)(2) HN gamma-Fe2O3 NH electrodes which exhibited high energy density of 99.28 W h kg(-1) at a power density of 1599.85 W kg(-1), with excellent cycling stability of 89.3% after 5000 cycles. Our results demonstrated that the beta-Ni(OH)(2) HN gamma-Fe2O3 NH electrode material could serve as a potential candidate for energy storage applications.