期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 8, 页码 2821-2826出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ta01325h
关键词
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资金
- University of Pretoria
- CSIR
- NRF Nanotechnology flagship programme
- US National Science Foundation [CHE-1012258, DMR-0804049]
- Grants-in-Aid for Scientific Research [20108007, 23350095, 25109502] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1012258] Funding Source: National Science Foundation
A novel asymmetric electrochemical capacitor (AEC) with high energy and power densities has been developed using a graphene oxide/cobalt(II)tetrapyrazinoporphyrazine composite (GO/CoTPyzPz) as the positive electrode and graphene oxide/carbon black (GO/CB) as the negative electrode in a neutral aqueous Na2SO4 electrolyte. The excellent specific capacitance, energy and power densities (similar to 500 F g(-1), 44 W h kg(-1) and 31 kW kg(-1)) coupled with long cycle life, excellent short response time, and low equivalent series resistance clearly indicate that this new material has great potential for the development of low-cost and 'green' aqueous AECs that operate at high energy and power densities. Interestingly, the energy density of the GO/CoTPyzPz//GOCB based AEC falls within the range usually observed for nickel metal hydride (NiMH) batteries (30-100 W h kg(-1)), but more importantly, shows better power performance than NiMH batteries (0.25-1 kW kg(-1)) widely used in hybrid vehicles such as Toyota Prius and Honda Insight.
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