Towards the understanding of the interfacial pH scale at Pt(1 1 1) electrodes
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http://hdl.handle.net/10045/53176
Títol: | Towards the understanding of the interfacial pH scale at Pt(1 1 1) electrodes |
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Autors: | Rizo, Rubén | Sitta, Elton | Herrero, Enrique | Climent, Victor | Feliu, Juan M. |
Grups d'investigació o GITE: | Electroquímica de Superficies |
Centre, Departament o Servei: | Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica |
Paraules clau: | Pt(1 1 1) | pztc | pzfc | Interfacial pH |
Àrees de coneixement: | Química Física |
Data de publicació: | 20-d’abril-2015 |
Editor: | Elsevier |
Citació bibliogràfica: | Electrochimica Acta. 2015, 162: 138-145. doi:10.1016/j.electacta.2015.01.069 |
Resum: | The determination of the potentials of zero total and free charge, pztc and pzfc respectively, were made in a wide pH range by using the CO displacement method and the same calculation assumptions used previously for Pt(1 1 1) electrodes in contact with non-specifically adsorbing anions. Calculation of the pzfc involves, in occasions, long extrapolations that lead us to the introduction of the concept of potential of zero extrapolated charge (pzec). It was observed that the pztc changes with pH but the pzec is independent of this parameter. It was observed that the pztc > pzec at pH > 3.4 but the opposite is true for pH > 3.4. At the latter pH both pzec and pztc coincide. This defines two different pH regions and means that adsorbed hydrogen has to be corrected in the “acidic” solutions at the pztc while adsorbed OH is the species to be corrected in the “alkaline” range. The comparison of the overall picture suggests that neutral conditions at the interface are attained at significantly acidic solutions than those at the bulk. |
Patrocinadors: | Support from MINECO (Spain) through project CTQ2013-44083-P is greatly acknowledged. E.S. also thanks CNPq (Brazil) for the scholarship (grant No. 200939/2012-2). |
URI: | http://hdl.handle.net/10045/53176 |
ISSN: | 0013-4686 (Print) | 1873-3859 (Online) |
DOI: | 10.1016/j.electacta.2015.01.069 |
Idioma: | eng |
Tipus: | info:eu-repo/semantics/article |
Drets: | © 2015 Elsevier Ltd. |
Revisió científica: | si |
Versió de l'editor: | http://dx.doi.org/10.1016/j.electacta.2015.01.069 |
Apareix a la col·lecció: | INV - EQSUP - Artículos de Revistas |
Arxius per aquest ítem:
Arxiu | Descripció | Tamany | Format | |
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2015_Rizo_etal_ElectrActa_final.pdf | Versión final (acceso restringido) | 653,73 kB | Adobe PDF | Obrir Sol·licitar una còpia |
2015_Rizo_etal_ElectrActa_preprint.pdf | Preprint (acceso abierto) | 304,77 kB | Adobe PDF | Obrir Vista prèvia |
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