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

Physical Chemistry Chemical Physics : PCCP
Francisco Fabregat-SantiagoJuan Bisquert

Abstract

The electrochemical behaviour of nanoporous TiO(2) 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 TiO(2) 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 TiO(2) 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.

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Citations

Feb 5, 2011·Physical Chemistry Chemical Physics : PCCP·Maryam SalariHua Kun Liu
Jul 10, 2012·The Analyst·Sangyun ParkTaek Dong Chung
Jun 9, 2015·Chemical Society Reviews·Cheng ZhongJiujun Zhang
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Dec 14, 2007·Physical Chemistry Chemical Physics : PCCP·Juan Bisquert
Mar 13, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ladislav KavanDavid Havlicek
Jul 12, 2019·Chemical Science·Cyrille Costentin, Jean-Michel Savéant
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Feb 8, 2014·ACS Applied Materials & Interfaces·Francesca NunziFilippo De Angelis

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