Mass measurements using isotopically labeled solvents reveal the extent of solvent transport during redox in thin films on electrodes
| Autor: | Daniel A. Buttry, Steven J. Lasky |
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| Rok vydání: | 1988 |
| Předmět: | |
| Zdroj: | Journal of the American Chemical Society. 110:6258-6260 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja00226a058 |
| Popis: | Transport of solvent during the redox reactions of thin films on electrodes has been identified as a possible influence on both the thermodynamic and kinetic aspects of their electrochemical responses. A variety of methods has been used in attempts to measure solvent content of these films, including ellipsometry and profilimetry. However, those techniques which rely on measurement of thickness suffer from inability to deconvolute the contributions to swelling (or deswelling) from ion and solvent transport. Thus, the situation remains one in which speculation abounds, but accurate measurements are unavailable. In this communication, the authors report on the application of the quartz crystal microbalance (QCM) technique to the determination of solvent transport during redox in thin films of nickel ferrocyanide (the nickel analogue of Prussian Blue) by comparing the difference in the total mass change (comprised of contributions from both ion and solvent transport) which results from use of isotopically substituted solvent. To their knowledge, these experiments represent the first accurate, unambiguous measurements of solvent transport in thin films on electrodes. It is especially significant that these measurements are made in the presence of simultaneous ion transport. |
| Databáze: | OpenAIRE |
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