Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 35, Pages 14413-14420Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta02721c
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Funding
- SRFDP [20110075110009, 20130075120018]
- 111 Project [111-2-04]
- Innovation Funds for PhD Students of Donghua University [12D10630]
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Free-standing three-dimensional hierarchical porous reduced graphene oxide foam (RGO-F) was first fabricated by a dipping and dry method using nickel foam as a template. Three-dimensional (3D) RGO-F with high conductivity provides large porosity compared to conventional graphene films. Polyaniline (PANI) nanowire arrays aligned on the foam (RGO-F/PANI) were synthesized by in situ polymerization. A symmetric supercapacitor with high energy and power densities was fabricated using a RGO-F/PANI electrode. The highly flexible RGO-F/PANI foam can directly serve as an electrode with no binders or conductive additives. Owing to the well-ordered porous structure and high electrochemical performance of the RGO-F/PANI composite, the symmetric device exhibits high specific capacitance (790 F g(-1)) and volumetric capacitance (205.4 F cm(-3)), and it shows a maximum energy density and power density of 17.6 W h kg(-1) and 98 kW kg(-1). Moreover, the device possesses an excellent cycle life with 80% capacitance retention after 5000 cycles.
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