The role of halide ions on the electrochemical behaviour of iron in alkali solutions

Active dissolution and passivation of transition metals in alkali solutions is of technological importance in batteries. The performance of alkaline batteries is decided by the presence of halides as they influence passivation. Cyclic voltammetric studies were carried out on iron in different sodium...

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Bibliographic Details
Published in:Applied surface science 2008-02, Vol.254 (8), p.2325-2330
Main Authors: Begum, S. Nathira, Muralidharan, V.S., Basha, C. Ahmed
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Cyclic voltammetry
Exact sciences and technology
Halide ions
Iron dissolution
Passivation
Physics
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Summary:Active dissolution and passivation of transition metals in alkali solutions is of technological importance in batteries. The performance of alkaline batteries is decided by the presence of halides as they influence passivation. Cyclic voltammetric studies were carried out on iron in different sodium hydroxide solutions in presence of halides. In alkali solutions iron formed hydroxo complexes and their polymers in the interfacial diffusion layer. With progress of time they formed a cation selective layer. The diffusion layer turned into bipolar ion selective layer consisted of halides, a selective inner sublayer to the metal side and cation selective outer layer to the solution side. At very high anodic potentials, dehydration and deprotonation led to the conversion of salt layer into an oxide.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2007.09.019