• 文献标题:   High-performance aqueous asymmetric electrochemical capacitors based on graphene oxide/cobalt((II))-tetrapyrazinoporphyrazine hybrids
  • 文献类型:   Article
  • 作  者:   LEKITIMA JN, OZOEMENA KI, JAFTA CJ, KOBAYASHI N, SONG Y, TONG D, CHEN SW, OYAMA M
  • 作者关键词:  
  • 出版物名称:   JOURNAL OF MATERIALS CHEMISTRY A
  • ISSN:   2050-7488 EI 2050-7496
  • 通讯作者地址:   Univ Pretoria
  • 被引频次:   25
  • DOI:   10.1039/c2ta01325h
  • 出版年:   2013

▎ 摘  要

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.