Interpretation of variations of jump diffusion coefficient of lithium intercalated into amorphous WO3 electrochromic films

Garcia-Belmonte, G., Vikhrenko, V. S., Garcia Canadas, Jorge and Bisquert, J. 2004. Interpretation of variations of jump diffusion coefficient of lithium intercalated into amorphous WO3 electrochromic films. Solid State Ionics 170 (1-2) , pp. 123-127. 10.1016/j.ssi.2004.02.009

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Abstract

We report a series of electrochemical analysis of homogeneous a-LixWO3 films of 400 nm thickness prepared by electron beam evaporation technique. Self-diffusion coefficient DJ was analyzed combining measurements of the chemical capacitance, Cch, and chemical diffusion coefficient, Dch, concluding that the barrier height involved in ion hopping increases ∼150 meV within the range of lithium insertion level 0.001<x<0.3. The observed dependences Cch∝xa (a≈0.65) and DJ∝x−c (c≈1.25) suggest that the energy changes governing charge storage and hopping are predominantly determined by the interaction energy of intercalant ions with the host glass.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords:	Amorphous films; Electrochromic films; Intercalation; Jump diffusion coefficient
Publisher:	Elsevier
ISSN:	0167-2738
Last Modified:	19 Mar 2016 23:21
URI:	https://orca.cardiff.ac.uk/id/eprint/48404

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