LAUSR

Ni3S2 nanosheet (NS) arrays on Ni foam were fabricated by a simple one-step electrodeposition strategy, and used as a kind of electrode material for asymmetric supercapacitors. The Ni3S2 NS arrays are interconnected, which can be regarded as bridges between these individual nanoparticle units. The electrochemical performances were evaluated by cyclic voltammetry and chronopotentiometry techniques in a three-electrode system. The Ni3S2 NS arrays display a specific capacitance of 773.6 F g-1 at 1 A g-1, and excellent rate property of 84.3% at 10 A g-1. The performance of the Ni3S2 NS arrays was further investigated in an asymmetric supercapacitor for potential practical application. The asymmetric supercapacitor using the Ni3S2 electrode and reduced graphene oxide electrode as positive and negative electrodes, respectively, exhibits an energy density of 41.2 W h kg-1 at 1.6 kW kg-1. When up to 16 kW kg-1, it holds 25.3 W h kg-1. These excellent electrochemical performances are attributed to the improved electronic conductivity and rich redox reaction sites from Ni3S2 NS arrays. Our results indicate that the Ni3S2 NS arrays have great potential for supercapacitors.摘要本文采用一步电沉积法制备了Ni3S2纳米片阵列超级电容器电极. Ni3S2纳米片彼此互连能够为电子传导提供快速通道, 有利于电子 与离子传输, 提供了丰富的赝电容反应位点. 采用不同电沉积次数探究了不同负载量的Ni3S2对其电化学性能的影响. 性能最好的Ni3S2电 极在1 A g-1下展示出773.6 F g-1的单位比电容, 在10 A g-1时具有84.3%的优异倍率性能. 组装的非对称超级电容器(Ni3S2//rGO)表现出优 良的使用性能. 这些结果表明了所制备的Ni3S2超级电容器电极材料具有广阔的应用前景. 电沉积法控制Ni3S2负载量的策略能够为电极材 料制备提供一种新思路.