Improving the performance of cobalt–nickel hydroxide-based self-supporting electrodes for supercapacitors using accumulative approaches
- 14 August 2013
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Energy & Environmental Science
- Vol. 6 (11), 3314-3321
- https://doi.org/10.1039/c3ee41143e
Abstract
In this paper we describe an accumulative approach to move beyond simple incorporation of conductive carbon nanostructures, such as graphene and carbon nanotubes, to improve the performance of metal oxide/hydroxide based electrodes in energy storage applications. In this approach we first synthesize Co–Ni double hydroxides/graphene binary composites through a co-precipitation process. We then assemble these composites into films (∼6 mg cm−2) by integrating with carbon nanotubes that can be used directly as electrodes. Experimental results indicate that the synergistic contributions from nanotubes, graphene and cobalt substitution enabled electrodes with substantially improved energy storage performance metrics. With 50% Co and 50% Ni (i.e. Co0.5Ni0.5(OH)2), the composite exhibited a remarkable maximum specific capacitance of 2360 F g−1 (360 mA h g−1) at 0.5 A g−1 and still maintained a specific capacitance as high as 2030 F g−1 at 20 A g−1 (∼86% retention). More importantly, the double hydroxides exhibited tunable redox behavior that can be controlled by the ratio between cobalt and nickel. These results demonstrate the importance of the rational design of functional composites and the large-scale assembly strategies for fabricating electrodes with improved performance and tunability for energy storage applications.This publication has 41 references indexed in Scilit:
- Flexible graphene–polyaniline composite paper for high-performance supercapacitorEnergy & Environmental Science, 2013
- 3D carbon based nanostructures for advanced supercapacitorsEnergy & Environmental Science, 2012
- Co3O4/Ni(OH)2 composite mesoporous nanosheet networks as a promising electrode for supercapacitor applicationsJournal of Materials Chemistry, 2012
- Advanced asymmetrical supercapacitors based on graphene hybrid materialsNano Research, 2011
- Electrochemical Energy Storage for Green GridChemical Reviews, 2011
- Graphene based new energy materialsEnergy & Environmental Science, 2011
- Design and Synthesis of Hierarchical MnO2 Nanospheres/Carbon Nanotubes/Conducting Polymer Ternary Composite for High Performance Electrochemical ElectrodesNano Letters, 2010
- Ni(OH)2 Nanoplates Grown on Graphene as Advanced Electrochemical Pseudocapacitor MaterialsJournal of the American Chemical Society, 2010
- Alpha Nickel Hydroxides as Lightweight Nickel Electrode Materials for Alkaline Rechargeable CellsChemistry of Materials, 2003
- Electrical properties of nickel hydroxide for alkaline cell systemsJournal of Power Sources, 1994