Kinetics of chemical decomposition of the solid electrolyte RbCu sub(4)Cl sub(3)I sub(2) by iodine

In the solid electrolyte cell, copper-RbCu sub(4)Cl sub(3)I sub(2)-I sub(2), glassy carbon, the EMF values at open circuit were measured as a function of time. Iodine was generated through anodic electrochemical decomposition of the electrolyte RbCu sub(4)Cl sub(3)I sub(2) and this iodine then furth...

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Bibliographic Details
Published in:Solid state ionics 2001-01, Vol.138 (3-4), p.199-202
Main Authors: Ostapenko, G I, Ostapenko, L A, Veselova, L G
Format: Article
Language:English
Online Access:Get full text
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Summary:In the solid electrolyte cell, copper-RbCu sub(4)Cl sub(3)I sub(2)-I sub(2), glassy carbon, the EMF values at open circuit were measured as a function of time. Iodine was generated through anodic electrochemical decomposition of the electrolyte RbCu sub(4)Cl sub(3)I sub(2) and this iodine then further reacted with the fresh electrolyte. An equation was deduced which relates the EMF values to the iodine concentration at the glassy carbon surface. It was shown that slow diffusion of the iodine in the reaction product layer is a limiting step in the chemical interaction of iodine with RbCu sub(4)Cl sub(3)I sub(2). For the compressed RbCu sub(4)Cl sub(3)I sub(2) sample investigated, the iodine diffusion coefficient was calculated to be 6.2x10 super(-7) cm super(2)/s. Iodine loss from the glassy carbon surface was about 1.1x10 super(-4) g /cm super(2) s. The thickness of the RbCu sub(4)Cl sub(3)I sub(2) sample was equal to 2 mm.
ISSN:0167-2738