Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 3, Pages 597-604Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201602447
Keywords
graphene; mesoporous materials; solid-state structures; supercapacitors; transition metals
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Funding
- Ministry of Science, ICT and Future Planning (MSIP), Korea under IT Consilience Creative Program [IITP-2015-R0346-15-1008]
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To achieve high energy storage on three-dimensional (3D) structures at low cost, materials with high power and long cycle life characteristics have to be developed. We synthesized ZnCo2O4/reduced graphene oxide (rGO) binary composites in commercial sponges. ZnCo2O4 nanosheets were grown on the surface of GO/sponge through a hydrothermal reaction. The resulting flexible, free-standing ZnCo2O4/rGO/sponge electrodes were used as the electrodes in a symmetric supercapacitor. ZnCo2O4/rGO/sponge electrodes have a large specific capacitance of 1116.6 F g(-1) at a scan rate of 2 mV s(-1) in aqueous electrolyte. The all-solid-state flexible supercapacitor is assembled based on ZnCo2O4/rGO/sponge electrodes, which show excellent electrochemical performances with a specific capacitance of 143 F g(-1) at a current density of 1 A g(-1) . The as-fabricated supercapacitor also exhibits excellent cycling stability (93.4% capacitance retention after 5000 cycles) and exceptional mechanical flexibility. These results demonstrate the potential of ZnCo2O4/rGO/sponge as an electrode in flexible, high-performance supercapacitors.
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