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In the present work, the NiCo O (NCO) nanowires were grown on three-dimensional (3D) porous graphene aerogel (GA) 2 4 through a facile two-step hydrothermal method, labeled as NCO/GA. NCO/GA obtained exhibited a high specific capacitance of −1 −1 720 F g at the current density of 1 A g and good cycling performance with 84% capacitance retention after 1000 cycles. Additionally, an asymmetric supercapacitor device was fabricated by using NCO/GA as the positive electrode and activated −1 carbon (AC) as the negative electrode. The as-prepared NCO/GA//AC device delivered a high energy density of 25.41 Wh kg −1 at a power density of 658 W kg and good cycling stability (78% of the initial capacitance retention after 3000 cycles). . . . Keywords NiCo O Nanowires Graphene aerogel Supercapacitor 2 4 Introduction the structural characteristics of graphene cannot be fully uti- lized due to the severe aggregation and restacking of graphene In recent years, with the incessant development and utilization sheets; the maximum utilization of reduced surface area be- of new energy resources, various energy storage devices have comes a serious obstacle [9]. To address the above-mentioned emerged to meet the demand of practical application. problem, the crustal stacking
Ionics – Springer Journals
Published: May 2, 2019
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