Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5165-5172Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2023433
Keywords
Sponge supercapacitor; energy storage; specific capacitance; specific power; MnO(2); carbon nanotubes
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Funding
- King Abdullah University of Science and Technology (KAUST) [KUS11-001-12]
- Precourt Institute for Energy at Stanford
- Stanford Graduate Fellowship
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A simple and scalable method has been developed to fabricate nanostructured MnO(2)-carbon nanotube (CNT)-sponge hybrid electrodes. A novel supercapacitor, henceforth referred to as sponge supercapacitor, has been fabricated using these hybrid electrodes with remarkable performance. A specific capacitance of 1230 F/g (based on the mass of MnO(2)) can be reached. Capacitors based on CNT-sponge substrates (without MnO(2)) can be operated even under a high scan rate of 200 V/s, and they exhibit outstanding cycle performance with only 2% degradation after 100000 cycles under a scan rate of 10 V/s. The MnO(2)-CNT-sponge supercapacitors show only 4% of degradation after 10000 cycles at a charge-discharge specific current of 5 A/g. The specific power and energy of the MnO(2)-CNT-sponge supercapacitors are high with values of 63 kW/kg and 31 Wh/kg, respectively. The attractive performances exhibited by these sponge supercapacitors make them potentially promising candidates for future energy storage systems.
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