Kinetics and mechanism of “reduced CO<sub>2</sub>” electrooxidation on electrodispersed platinum in different acid solutions
The electrooxidation of “reduced CO<sub>2</sub>” electroadsorbates on electrodispersed platinum electrodes has been investigated in 0.05 M HClO<sub>4</sub>, 1 M HClO4, 0.5 M H<sub>2</sub>SO<sub>4</sub> and 1 M H<sub>3</sub>PO<sub>4<...
| Autores: | , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1989 |
| País: | Argentina |
| Recursos: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/121661 |
| Acesso em linha: | http://sedici.unlp.edu.ar/handle/10915/121661 |
| Access Level: | acceso abierto |
| Palavra-chave: | Ciencias Exactas Química Electrooxidation CO2 Kinetics |
| Resumo: | The electrooxidation of “reduced CO<sub>2</sub>” electroadsorbates on electrodispersed platinum electrodes has been investigated in 0.05 M HClO<sub>4</sub>, 1 M HClO4, 0.5 M H<sub>2</sub>SO<sub>4</sub> and 1 M H<sub>3</sub>PO<sub>4</sub> at 25° C through voltammetry and potential step techniques. The overall reaction comprises three distinguishable processes, namely a first order triggering process, and two second order surface processes. The latter are influenced remarkably by the solution composition (anions). The second order reaction mechanism involves two distinguishable “ reduced CO<sub>2</sub>” electroadsorbates which react independently with the OH species formed from H<sub>2</sub>O electrooxidation on the bare platinum sites as the reaction proceeds. An interaction term has to be included in the rate equations to account for the experimental results. The mechanistic interpretation accounts for the values of the number of electrons per site ranging from 1 to 2. |
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