Graphene-Based Supercapacitor with an Ultrahigh Energy Density
- 8 November 2010
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 10 (12), 4863-4868
- https://doi.org/10.1021/nl102661q
Abstract
A supercapacitor with graphene-based electrodes was found to exhibit a specific energy density of 85.6 Wh/kg at room temperature and 136 Wh/kg at 80 °C (all based on the total electrode weight), measured at a current density of 1 A/g. These energy density values are comparable to that of the Ni metal hydride battery, but the supercapacitor can be charged or discharged in seconds or minutes. The key to success was the ability to make full utilization of the highest intrinsic surface capacitance and specific surface area of single-layer graphene by preparing curved graphene sheets that will not restack face-to-face. The curved morphology enables the formation of mesopores accessible to and wettable by environmentally benign ionic liquids capable of operating at a voltage >4 V.Keywords
This publication has 35 references indexed in Scilit:
- Graphene nanosheets as electrode material for electric double-layer capacitorsElectrochimica Acta, 2010
- Graphene and Graphene Oxide: Synthesis, Properties, and ApplicationsAdvanced Materials, 2010
- Graphene Oxide−MnO2 Nanocomposites for SupercapacitorsACS Nano, 2010
- Supercapacitors Based on Flexible Graphene/Polyaniline Nanofiber Composite FilmsACS Nano, 2010
- Graphene-based carbon nano-fibers grown on thin-sheet sinter-locked Ni-fiber as self-supported electrodes for supercapacitorsMaterials Letters, 2010
- Graphene/Polyaniline Nanofiber Composites as Supercapacitor ElectrodesChemistry of Materials, 2010
- Exfoliated Graphene Separated by Platinum NanoparticlesChemistry of Materials, 2008
- Measurement of the Elastic Properties and Intrinsic Strength of Monolayer GrapheneScience, 2008
- Electric double layer capacitors with gelled polymer electrolytes based on poly(ethylene oxide) cured with poly(propylene oxide) diaminesElectrochimica Acta, 2008
- Superior Thermal Conductivity of Single-Layer GrapheneNano Letters, 2008