Chemical capacitance of nanoporous-nanocrystalline TiO2 in a room temperature ionic liquid

Francisco Fabregat-Santiago, Hyacinthe Randriamahazaka, Arie Zaban, Jorge Garcia-Cañadas, G. Garcia-Belmonte, Juan Bisquert

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

The electrochemical behaviour of nanoporous TiO2 in a room temperature ionic liquid (RTIL), 1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide (EMITFSI), was investigated by cyclic voltammetry (CV) and impedance spectroscopy. Exponentially rising currents in voltammetry were attributed to the charging/discharging of electrons in the TiO2 film and a charge transfer mechanism. The main features of the voltammetry and impedance followed the same trends in the ionic liquid as in other organic solvents and also in aqueous electrolytes. In the presence of lithium ions, the onset potential of the charge accumulation increased due to the change of the initial position of the TiO2 conduction band. The results show that substitution of organic solvents contained in solar cells, supercapacitors or other electrochemical devices is in general feasible, though requires some adjustment in the electrolyte composition for optimal performance.

Original languageEnglish
Pages (from-to)1827-1833
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume8
Issue number15
DOIs
StatePublished - 21 Apr 2006

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