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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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 |
|---|---|
| Publication: | Journal of The Electrochemical Society |
| Publisher: | The Electrochemical Society |
| 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.ac.in/id/eprint/4669 |
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