Kinetics of CO<sub>2</sub> electroadsorption on electrodispersed platinum electrodes in acid solutions
The kinetics of CO<sub>2</sub> electroadsorption on electrodispersed Pt electrodes have been investigated in different acid electrolytes. The kinetic data obtained at different adsorption potentials, adsorption times and CO<sub>2</sub> concentrations in solution have been int...
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| Autores principales: | , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1990
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121791 |
| Aporte de: |
| Sumario: | The kinetics of CO<sub>2</sub> electroadsorption on electrodispersed Pt electrodes have been investigated in different acid electrolytes. The kinetic data obtained at different adsorption potentials, adsorption times and CO<sub>2</sub> concentrations in solution have been interpreted in terms of two complex reaction mechanisms involving the formation of strongly and weakly bound reduced CO<sub>2</sub> adsorbates through reactions involving s-H and w-H adatoms, respectively, and carbon dioxide. The reaction mechanism between H adatoms and CO<sub>2</sub> implies the initial electroadsorption of H atoms, the transport of CO<sub>2</sub> from the bulk of the solution to the reaction interface, and the formation of the reduced CO<sub>2</sub> adsorbate. Under certain conditions, particularly when s-H adatoms are involved, the entire reaction approaches mass transport rate control. Conversely, the reaction between w-H adatoms and CO<sub>2</sub> appears as a rather slow process. |
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