Effect of NaI/I2 mediators on properties of PEO/LiAlO 2 based all-solid-state supercapacitors

Yijing Yin, Juanjuan Zhou, Azzam N. Mansour, Xiangyang Zhou

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


NaI/I2 mediators and activated carbon were added into poly(ethylene oxide) (PEO)/lithium aluminate (LiAlO2) electrolyte to fabricate composite electrodes. All solid-state supercapacitors were fabricated using the as prepared composite electrodes and a Nafion 117 membrane as a separator. Cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge/discharge measurements were conducted to evaluate the electrochemical properties of the supercapacitors. With the addition of NaI/I2 mediators, the specific capacitance increased by 27 folds up to 150 F g-1. The specific capacitance increased with increases in the concentration of mediators in the electrodes. The addition of mediators also reduced the electrode resistance and rendered a higher electron transfer rate between mediator and mediator. The stability of the all-solid-state supercapacitor was tested over 2000 charge/discharge cycles.

Original languageEnglish (US)
Pages (from-to)5997-6002
Number of pages6
JournalJournal of Power Sources
Issue number14
StatePublished - Jul 15 2011


  • NaI/I mediator
  • PEO/LiAlO/AC
  • Solid-state
  • Supercapacitor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry


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