Dynamic behaviour of viologen-activated nanostructured TiO2: correlation between kinetics of charging and coloration

Garcia Canadas, Jorge, Fabregat-Santiago, F., Kapla, J., Bisquert, J., Garcia-Belmonte, G., Mora-Sero, I. and Edwards, M. O. M. 2004. Dynamic behaviour of viologen-activated nanostructured TiO2: correlation between kinetics of charging and coloration. Electrochimica Acta 49 (5) , pp. 745-752. 10.1016/j.electacta.2003.09.028

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Abstract

The dynamic response of viologen-activated nanostructured titanium dioxide has been studied by means of electrical and electro-optical measurements. We show that the state of charge of the semiconductor network is the key factor mediating between the electrode potential and colouration of viologen. Theoretically, we relate the electrode potential to the statistics of occupancy of both TiO2 nanoparticles and oxidized viologen molecules attached to the surface, on the assumption of quasi-equilibrium of Fermi levels in these contacting phases. Experimentally, we determine the statistical function from steady-state measurements (electrochemical impedance spectroscopy) of the capacitance of the semiconductor film. From this understanding we explain the main features that correlate the simultaneous voltammetry and transmittance responses. Finally, the redox process of viologen is resolved separately from the TiO2 response by means of transmittance data.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Engineering
Subjects:	Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	Charging and coloration; Viologen; Nanostructured TiO2; Electrochromism
Publisher:	Elsevier
ISSN:	0013-4686
Last Modified:	19 Mar 2016 23:21
URI:	https://orca.cardiff.ac.uk/id/eprint/48400

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