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Electrodeposition of Adherent Films of Lithium Phthalocyanine on Platinum and Stainless Steel Substrates by Oxidation of Dilithium Phthalocyanine

Sakthivel, K and Munichandraiah, N and Scanlon, LG (2005) Electrodeposition of Adherent Films of Lithium Phthalocyanine on Platinum and Stainless Steel Substrates by Oxidation of Dilithium Phthalocyanine. In: Journal of The Electrochemical Society, 152 (11). C756-C763.

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Abstract

Films of lithium phthalocyanine (LiPc) on Pt and stainless steel (SS) substrates are deposited by electrochemical oxidation of dilithium phthalocyanine $(Li_{2}Pc)$ in dimethyl sulfoxide or acetone consisting of $LiBF_{4}$ as the supporting electrolyte. Unlike the powdery deposits of LiPc obtained by using tetrabutyl ammonium perchlorate (TBAP) as the supporting electrolyte, the deposits are adherent to the substrates when $LiBF_{4}$ is used as the supporting electrolyte. Chemical oxidation of $(Li_{2}Pc)$ by TBAP is shown to be detrimental for the formation of powdery electrodeposits of LiPc, whereas $LiBF_{4}$ does not oxidize $(Li_{2}Pc)$ and therefore adherent films of LiPc are obtained by electro-oxidation. Furthermore, the kinetics of electro-oxidation of $(Li_{2}Pc)$ to LiPc is different in TBAP and $LiBF_{4}$ solutions, as inferred from the nature of cyclic voltammograms and also the values of transfer coefficient. The oxidation of $(Li_{2}Pc)$ occurs at higher potentials on SS in relation to the reaction on Pt. Nevertheless, LiPc films are adherent on both substrates and their crystal structure corresponds to \alpha-phase. The LiPc/Pt electrodes exhibit electrochemical activity, whereas LiPc/SS electrodes exhibit capacitive behavior. The texture of LiPc on both Pt and SS is found to be fiber-like.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to The Electrochemical Society.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 15 Dec 2005
Last Modified: 27 Aug 2008 11:38
URI: http://eprints.iisc.ernet.in/id/eprint/4669

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