Journal article
High-performance symmetric electrochemical capacitor based on graphene foam and nanostructured manganese oxide
AIP advances, v 3(8), pp 82118-082118
Aug 2013
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
We have fabricated a symmetric electrochemical capacitor with high energy and power densities based on a composite of graphene foam (GF) with ∼80 wt% of manganese oxide (MnO2) deposited by hydrothermal synthesis. Raman spectroscopy and X-ray diffraction measurements showed the presence of nanocrystalline MnO2 on the GF, while scanning and transmission electron microscopies showed needle-like manganese oxide coated and anchored onto the surface of graphene. Electrochemical measurements of the composite electrode gave a specific capacitance of 240 Fg−1 at a current density of 0.1 Ag−1 for symmetric supercapacitors using a two-electrode configuration. A maximum energy density of 8.3 Whkg−1 was obtained, with power density of 20 kWkg−1 and no capacitance loss after 1000 cycles. GF is an excellent support for pseudo-capacitive oxide materials such as MnO2, and the composite electrode provided a high energy density due to a combination of double-layer and redox capacitance mechanisms.
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Details
- Title
- High-performance symmetric electrochemical capacitor based on graphene foam and nanostructured manganese oxide
- Creators
- Abdulhakeem Bello - University of PretoriaOmobosede O Fashedemi - University of PretoriaJoel N Lekitima - University of PretoriaMopeli Fabiane - University of PretoriaDavid Dodoo-Arhin - University of PretoriaKenneth I Ozoemena - 5Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USAYury Gogotsi - Drexel UniversityAlan T Charlie Johnson - University of PennsylvaniaNcholu Manyala - University of Pretoria
- Publication Details
- AIP advances, v 3(8), pp 82118-082118
- Publisher
- American Institute of Physics (AIP)
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000323845000018
- Scopus ID
- 2-s2.0-84883879825
- Other Identifier
- 991014969773304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied