Agnihotry, S. A. and Singh, Punita and Joshi, Amish G. and Singh, D. P and Sood, K. N and Shivaprasad, S. M. (2006) Electrodeposited Prussian blue films: Annealing effect. Electrochimica Acta, 51 (20). pp. 4291-4301. ISSN 0013-4686 (Unpublished)

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Abstract

The correlation between the temperature-dependent electrochromic (EC) activity and other properties of galvarlostatically deposited Prussian Blue (PB) films is presented here. Films subjected to annealing treatment in air at temperatures up to 500 degrees C were characterized by a variety of techniques which include TGA, XRD, FTIR, UV-vis spectrophotometry, SEM, XPS, cyclic voltammetry etc. The as-deposited X-ray amorphous hydrated PB films were blue in color and had Fe in both Fe-II and Fe-III valence states and were electrochromically active. Consequent to changes in the valence state, degree of hydration and coordination environment of the iron ions upon annealing, EC activity and morphology of the films exhibited dramatic changes. Annealing at moderate temperatures retained the blue color of the films and decreased the EC activity consistent with dehydration and decreased the Fell content. Lack of EC activity at higher temperatures was consistent with dehydration and quenching of Fell states accompanied with change of color from blue to rust (Fell) typical of Fe2O3. Independent of the annealing temperature, the films retained their amorphicity, however, prolonged annealing at 500 degrees C yielded hexagonal Fe2O3.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier.
Subjects:	Electrochemistry
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	09 May 2018 11:59
Last Modified:	09 May 2018 11:59
URI:	http://npl.csircentral.net/id/eprint/2468

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