Synergistic Effect between Ultra-Small Nickel Hydroxide Nanoparticles and Reduced Graphene Oxide sheets for the Application in High-Performance Asymmetric Supercapacitor.

摘要: Nanoscale electrode materials including metal oxide nanoparticles and two-dimensional graphene have been employed for designing supercapacitors. However, inevitable agglomeration of layers stacking largely hamper their practical applications. Here we demonstrate an efficient co-ordination synergistic effect between ultra-small Ni(OH)2 reduced (RGO) sheets synthesizing ideal materials. On one hand, to make the work at full capacity as pseudocapacitive material, RGO are suitable substrate anchor these against agglomeration. As a consequence, ultrahigh specific capacitance 1717 F g−1 0.5 A is achieved. other further facilitate ion transfer within electrical double layer capacitor introduced among recyclable sacrificial spacer prevent stacking. The resulting exhibit superior rate capability with high 182 F 100 A g−1. this basis, asymmetric supercapacitor assembled using two materials, delivering energy density 75 Wh kg−1 power 40 000 W kg−1.