Few-Layer Graphene Functionalized by Carbon Nanotubes and MnO{sub 2} Nanoparticles for High-Performance Supercapacitors
- Liaoning Shihua University, College of Chemistry, Chemical Engineering and Environmental Engineering (China)
- Nanjing University of Posts and Telecommunications, Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials, School of Materials Science and Engineering (China)
Few-layer graphene (FLG) exfoliated from graphite is an attractive electrode material due to its high conductivity and high chemical stability. But usually limited by their specific surface area (SSA), its capacitance needs to be improved when used in supercapacitors. In this study, FLG has been prepared by combining electrochemical exfoliation and thermal expansion. It has a SSA of 148 m{sup 2}/g and delivers a capacitance of 55 F/g at a discharge current density of 1 A/g. To increase its capacitance, carbon nanotubes (CNTs) and MnO{sub 2} nanoparticles are functionalized onto FLG surface separately. Both modification could achieve a composite electrode with enhanced capacitance. The CNT/FLG and MnO{sub 2}/FLG electrodes show a specific capacitance of 106 and 336 F/g at the current density of 1 A/g, respectively, while the former exhibits a much better rate performance and cycling stability than the latter. This work demonstrates an optional way to improve the performance of FLG-based supercapacitors.
- OSTI ID:
- 22970671
- Journal Information:
- Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 7 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
- Country of Publication:
- United States
- Language:
- English
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