Analysis of cyclic voltammograms of electrochromic a-WO3 films from voltage-dependent equilibrium capacitance measurements

Garcia Canadas, Jorge, Mora-Sero, I., Fabregat-Santiago, F., Bisquert, J. and Garcia-Belmonte, G. 2004. Analysis of cyclic voltammograms of electrochromic a-WO3 films from voltage-dependent equilibrium capacitance measurements. Journal of Electroanalytical Chemistry 565 (2) , pp. 329-334. 10.1016/j.jelechem.2003.10.027

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Abstract

The main features of cyclic voltammograms (CVs) of thin electrochromic films based on a-WO3 were investigated. First, the chemical capacitance is defined in terms of the electrochemical potential variation with the insertion level, x, and is measured under galvanostatic (chronopotentiometry) quasi-equilibrium conditions. An equilibrium capacitance increasing rapidly with respect to insertion level or negative potential is observed, respectively Cch∝xa at x>10−3(a≈0.74) and Cch∝Vα(α≈3). Simulation methods used to generate the observed CVs are described in detail. Major CV peaks can be simply understood as charging and discharging of the variable capacitor, in conjunction with a distortion of the voltage scale due to a series transport process. Therefore a simple RC equivalent circuit allows us to explain the principal CVs characteristics of lithium intercalation and deintercalation in amorphous films.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	Chronopotentiometry; Voltammetry; Electrochromic films; Capacitance; Equivalent circuit
Publisher:	Elsevier
ISSN:	1572-6657
Last Modified:	19 Mar 2016 23:21
URI:	https://orca.cardiff.ac.uk/id/eprint/48403

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