期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 3, 期 7, 页码 4035-4041出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta06322h
关键词
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资金
- Science and Technology program of Gansu Province [1308RJZA295, 1308RJZA265]
- National Science Foundation of China [21164009, 21174114]
- program for Changjiang Scholars and Innovative Research Team in University [IRT1177]
A stable and effective redox-mediator gel electrolyte has been prepared by doping indigo carmine (IC) into a polyvinyl alcohol sulfuric acid polymer system (PVA-H2SO4), and a high performance solid state supercapacitor is fabricated by utilizing activated carbon as electrodes and the prepared gel polymer (PVA-H2SO4-IC) as an electrolyte and separator. The PVA-H2SO4-IC gel polymer has excellent bending, compressing and stretching mechanical properties. As expected, the ionic conductivity of the gel polymer electrolyte increased by 188% up to 20.27 mS cm(-1) while introducing IC as the redox mediator in the PVA-H2SO4 gel electrolyte. Simultaneously, specific capacitance is increased by 112.2% (382 F g(-1)) and energy density (13.26 W h kg(-1)) is also increased. Furthermore, the fabricated device shows superior charge-discharge stability. After 3000 cycles, its capacitive retention ratio is still as high as 80.3%. This result may be due to the fact that the IC can act as a plasticizer and redox mediator, and the supercapacitor combines the double-layer characteristic of carbon-based supercapacitors and the faradaic reaction characteristic of batteries energy-storage processes.
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