Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution
The electroformation of adsorbed species on Pt and Rh from CO<sub>2</sub> dissolved in aqueous 0.5 M H<sub>2</sub>SO<sub>4</sub> and the influence of adsorbed species on the hydrogen evolution reaction (HER) were examined for smooth and columnar structured Pt and...
Guardado en:
| Autores principales: | , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
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1995
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/119205 https://www.sciencedirect.com/science/article/abs/pii/0022072895040989 |
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I19-R120-10915-119205 |
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dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química CO2 electrochemistry Acid solutions |
| spellingShingle |
Ciencias Exactas Química CO2 electrochemistry Acid solutions Marcos, M. L. González-Velasco, J. Bolzán, Agustín Eduardo Arvia, Alejandro Jorge Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| topic_facet |
Ciencias Exactas Química CO2 electrochemistry Acid solutions |
| description |
The electroformation of adsorbed species on Pt and Rh from CO<sub>2</sub> dissolved in aqueous 0.5 M H<sub>2</sub>SO<sub>4</sub> and the influence of adsorbed species on the hydrogen evolution reaction (HER) were examined for smooth and columnar structured Pt and smooth and rhodized Rh electrodes at 25|dgC. Different electrosorbed species resulting from the adsorption of CO<sub>2</sub> on Rh were found. The electro-oxidation of these adsorbates on Rh takes place over a potential range larger than that for adsorbates on Pt, overlapping the potential range of electroformation of the O-containing layer. A part of the reduced CO<sub>2</sub> adsorbates on Rh behaves as CO-like adsorbates. The presence of adsorbed species from CO<sub>2</sub> influences differently the stationary HER current potential curves for both types of Pt and Rh electrodes. In the range of low current density (cd), the Tafel slope for Pt is −0.030 V decade<sup>−1</sup>. Conversely, the presence of a chemisorbed species on Rh changes the Tafel slope for the HER in the range of low cd from −0.030 V decade<sup>−1</sup> for CO<sub>2</sub>-free solutions to −0.120 V decade<sup>−1</sup> for CO<sub>2</sub>-saturated solution. These changes are explained by a modification in the rate-determining step of the HER produced by chemisorbed species. |
| format |
Articulo Articulo |
| author |
Marcos, M. L. González-Velasco, J. Bolzán, Agustín Eduardo Arvia, Alejandro Jorge |
| author_facet |
Marcos, M. L. González-Velasco, J. Bolzán, Agustín Eduardo Arvia, Alejandro Jorge |
| author_sort |
Marcos, M. L. |
| title |
Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| title_short |
Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| title_full |
Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| title_fullStr |
Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| title_full_unstemmed |
Comparative electrochemical behaviour of CO<sub>2</sub> on Pt and Rh electrodes in acid solution |
| title_sort |
comparative electrochemical behaviour of co<sub>2</sub> on pt and rh electrodes in acid solution |
| publishDate |
1995 |
| url |
http://sedici.unlp.edu.ar/handle/10915/119205 https://www.sciencedirect.com/science/article/abs/pii/0022072895040989 |
| work_keys_str_mv |
AT marcosml comparativeelectrochemicalbehaviourofcosub2subonptandrhelectrodesinacidsolution AT gonzalezvelascoj comparativeelectrochemicalbehaviourofcosub2subonptandrhelectrodesinacidsolution AT bolzanagustineduardo comparativeelectrochemicalbehaviourofcosub2subonptandrhelectrodesinacidsolution AT arviaalejandrojorge comparativeelectrochemicalbehaviourofcosub2subonptandrhelectrodesinacidsolution |
| bdutipo_str |
Repositorios |
| _version_ |
1764820448006111232 |