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Electrodeposited Prussian blue films: Annealing effect

IR@NPL: CSIR-National Physical Laboratory, New Delhi


Field	Value

Title	Electrodeposited Prussian blue films: Annealing effect

Creator	Agnihotry, S. A. Singh, Punita Joshi, Amish G. Singh, D. P Sood, K. N Shivaprasad, S. M.

Subject	Electrochemistry

Description	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.

Publisher	Elsevier

Date	2006-05-25

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://npl.csircentral.net/2468/1/55.pdf 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 ISSN 0013-4686 (Unpublished)

Relation	http://npl.csircentral.net/2468/