Journal
NANO LETTERS
Volume 14, Issue 3, Pages 1651-1658Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl5001778
Keywords
Graphite foam; graphene foam; conducting polymer; core/shell; nanowire arrays; supercapacitor
Categories
Funding
- SERC Public Sector Research Funding [1121202012]
- Agency for Science, Technology, and Research (A*STAR)
- Energy Research Institute @NTU (ERI@N)
- MOE AcRF [ARC 26/13, MOE2013-T2-1-034]
- AcRF [RG 61/12, RGT18/13]
- National Research Foundation, Prime Minister's Office, Singapore
- [M4080865.070.706022]
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We attempt to meet the general design requirements for high-performance supercapacitor electrodes by combining the strategies of lightweight substrate, porous nanostructure design, and conductivity modification. We fabricate a new type of 3D porous and thin graphite foams (GF) and use as the light and conductive substrates for the growth of metal oxide core/shell nanowire arrays to form integrated electrodes. The nanowire core is Co3O4, and the shell is a composite of conducting polymer (poly(3,4-ethylenedioxythiophene), PEDOT) and metal oxide (MnO2). To show the advantage of this integrated electrode design (viz., GF + Co3O4/PEDOT MnO2 core/shell nanowire arrays), three other different less-integrated electrodes are also prepared for comparison. Full supercapacitor devices based on the GF + Co3O4/PEDOT-MnO2 as positive electrodes exhibit the best performance compared to other three counterparts due to an optimal design of structure and a synergistic effect.
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