Synthesis of self-assembly 3D porous Ni(OH)2 with high capacitance for hybrid supercapacitors

摘要: Abstract Nickel hydroxide has shown extraordinary promise for hybrid supercapacitors because of the high theoretical capacity and low cost, but is usually limited by its power density complex synthetic process. Here, we report design a self-assembly three-dimensional (3D) porous Ni(OH)2 high-performance energy storage through simple, cost-effective, environmentally friendly solvothermal-precipitation method. The 3D structure with interconnected network provides superior electron transportation properties, hierarchical architecture facilitates quick ion diffusion. obtained at 250 °C delivers capacitance 2110 F g−1 at 1.0 A g−1 moderate cycling stability 53% maximum specific over 2000 cycles 5.0 A g−1. Additionally, on integration prepared hierarchically carbons as negative electrode material, supercapacitor device 115 F g−1 40.9 W h kg−1 405 W kg−1. This study not only simply controllable growth method unique performance also opens up new approach to prepare various metallic oxides/hydroxides excellent highly promising practical energy-storage systems.