Effect of the electrolyte composition on the electroreduction of palladium oxide films
The voltammetric electroreduction of Pd oxide layers grown at 2.00 V (RHE) was studied in H<sub>2</sub>SO<sub>4</sub> and HClO<sub>4</sub> solutions containing different concentrations of LiClO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</...
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| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1993
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/119374 |
| Aporte de: |
| Sumario: | The voltammetric electroreduction of Pd oxide layers grown at 2.00 V (RHE) was studied in H<sub>2</sub>SO<sub>4</sub> and HClO<sub>4</sub> solutions containing different concentrations of LiClO<sub>4</sub>, Na<sub>2</sub>SO<sub>4</sub> and KHSO<sub>4</sub>. The voltammetric electroreduction profiles show two main regions; the first is in the range 1.2–1.6 V and is related to the electroreduction of a fast redox system; the second region extends through the range 1.1-0.40 V, where the electroreduction of the thick oxide matrix takes place. This latter process is strongly affected by the solution composition, including the pH, in a manner contrasting to the effect on Pd oxide growth. The thick oxide layer electroreduction charge increases as the solution pH is decreased. These results are discussed in terms of specific interaction between sulphate ions and the oxide layer, so that the electroreduction process is favoured owing to the likely formation of sulphate-containing complex species. |
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