Hexagonal sheets of Co3O4 and Co3O4-Ag for high-performance electrochemical supercapacitors

Hexagonal sheets of Co3O4 on nickel foam were synthesized by a facile, economical, scalable, and one pot hydrothermal method for supercapacitor studies. The electrical conductivity and catalytic activity were enhanced through the decoration of Co3O4 by silver (Ag) nanoparticles using a simple chemical approach. The hexagonal sheets served as an excellent backbone together with the Ag nanoparticles, which gave the composites a superior specific capacitance of 958 F g(-1) and an energy density of 0.203 kWh kg(-1). The electrode exhibited excellent cycling stability with a capacitance retention of 104% after the initial 1000 CV cycles with a maximum specific capacitance 996 Fg(-1). (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.