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High Energy Density Supercapacitor Based on a Hybrid Carbon Nanotube–Reduced Graphite Oxide Architecture |
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| Authors: | Neetu Jha Palanisamy Ramesh Elena Bekyarova Mikhail E Itkis Robert C Haddon |
| Institution: | 1. Center for Nanoscale Science and Engineering, Department of Chemistry, University of California ‐ Riverside, Riverside, California 92521, USA;2. Center for Nanoscale Science and Engineering, Department of Chemical & Environmental Engineering, University of California ‐ Riverside, Riverside, California 92521, USA;3. Carbon Solutions Inc., 1200 Columbia Ave., Riverside, California 92507, USA |
| Abstract: | A high energy density supercapacitor device is reported that utilizes hybrid carbon electrodes and the ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMIMBF4) as an electrolyte. The hybrid electrodes are prepared from reduced graphite oxide (rGO) and purified single‐walled carbon nanotubes (SWCNTs). A simple casting technique gives the hybrid structure with optimum porosity and functionality that provides high energy and power densities. The combination of SWCNTs and rGO in a weight ratio of 1:1 is found to afford a specific capacitance of 222 F g?1 and an energy density of 94 Wh kg?1 at room temperature. |
| Keywords: | energy density reduced graphite oxide single wall carbon nanotubes supercapacitors synergistic effects |