One-pot synthesis of Ni(OH)_2 flakes embeded in highly-conductive carbon nanotube/graphene hybrid framework as high performance electrodes for supercapacitors

摘要

A high performance electrode material for supercapacitors is achieved by incorporating 20-30 nm Ni (OH)(2) nanoflakes into a highly porous CNT/rGO hybrid framework. The Ni(OH)(2)/CNT/rGO nanocomposite delivers a high specific capacitance of 633 F g (-1) at 1 A g(-1) based on the total mass of the composite, implying favorable charge transfer reactions. Even at 10 A g(-1), 65% of the capacitance can be retained, demonstrating impressive high-rate performance. Remarkable cyclic performance was also delivered, with capacitance retention of 80% after 3000 cycles at 2 A g(-1). The remarkable power capability and cycle stability was attributed to the rational design, homogenous microstructure and consequent synergistic effect generated in the composite. The simple and scalable one-pot synthesis procedure can be extended to fabrication of other high performance energy storage materials. (C) 2017 Elsevier B.V. All rights reserved.