Issue 15, 2006
From the journal:

Physical Chemistry Chemical Physics

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

Francisco Fabregat-Santiago,*a   Hyacinthe Randriamahazaka,*b   Arie Zaban,c   Jorge Garcia-Cañadas,a   G. Garcia-Belmontea  and  Juan Bisquerta  

* Corresponding authors

a Departament de Ciències Experimentals, Universitat Jaume I, Castelló, Spain
E-mail: fabresan@exp.uji.es
Fax: +34 964 728066
Tel: +34 964 728024

b Interfaces, Traitements, Organisation et Dynamique des Systèmes (ITODYS), CNRS-UMR 7086, Université Paris 7 - Denis Diderot, 1 rue Guy de la Brosse, Paris, France
E-mail: randria@itodys.jussieu.fr
Fax: +33 144 276814
Tel: +33 144 276107

c Department of Chemistry, Bar-Ilan University, Ramat-Gan 52900, Israel

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.

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

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Article information

DOI
https://doi.org/10.1039/B600452K
Article type
Paper
Submitted
12 Jan 2006
Accepted
17 Feb 2006
First published
28 Mar 2006

Phys. Chem. Chem. Phys., 2006,8, 1827-1833

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

F. Fabregat-Santiago, H. Randriamahazaka, A. Zaban, J. Garcia-Cañadas, G. Garcia-Belmonte and J. Bisquert, Phys. Chem. Chem. Phys., 2006, 8, 1827 DOI: 10.1039/B600452K

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