Kinetic Study of the hydrogen electrode reaction on Bi-modified Platinum
The present work deals with a kinetic study of the hydrogen electrode reaction (HER) on a platinum electrode modified by bismuth adatoms in both cathodic and anodic range of overpotentials. Kinetic expressions previously derived for the Volmer-Heyrovsky-Tafel mechanism were modified in order to take...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2009 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/101895 |
| Acceso en línea: | http://hdl.handle.net/11336/101895 |
| Access Level: | acceso abierto |
| Palabra clave: | HYDROGEN ELECTRODE REACTION UNDERPOTENTIAL DEPOSITION BI-MODIFIED PLATINUM ELECTRODE https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
| Sumario: | The present work deals with a kinetic study of the hydrogen electrode reaction (HER) on a platinum electrode modified by bismuth adatoms in both cathodic and anodic range of overpotentials. Kinetic expressions previously derived for the Volmer-Heyrovsky-Tafel mechanism were modified in order to take into account the influence of bismuth. Thus, a modification of the adsorption energy of the reaction intermediate, described through the variation of the Frumkin interaction parameter, and a possible effect of inhibition on the active sites were included in the kinetic expressions. On this basis, the experimental results obtained in the overpotentials range -0.20 < h / V < 0.40 were successfully correlated through the variation of only four adjustable parameters, which dependence on the bismuth surface coverage were evaluated and discussed. |
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