Towards the understanding of the interfacial pH scale at Pt(1 1 1) electrodes

Please use this identifier to cite or link to this item:
Información del item - Informació de l'item - Item information
Title: Towards the understanding of the interfacial pH scale at Pt(1 1 1) electrodes
Authors: Rizo, Rubén | Sitta, Elton | Herrero, Enrique | Climent, Victor | Feliu, Juan M.
Research Group/s: Electroquímica de Superficies
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Pt(1 1 1) | pztc | pzfc | Interfacial pH
Knowledge Area: Química Física
Issue Date: 20-Apr-2015
Publisher: Elsevier
Citation: Electrochimica Acta. 2015, 162: 138-145. doi:10.1016/j.electacta.2015.01.069
Abstract: 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.
Sponsor: 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).
ISSN: 0013-4686 (Print) | 1873-3859 (Online)
DOI: 10.1016/j.electacta.2015.01.069
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier Ltd.
Peer Review: si
Publisher version:
Appears in Collections:INV - EQSUP - Artículos de Revistas

Files in This Item:
Files in This Item:
File Description SizeFormat 
Thumbnail2015_Rizo_etal_ElectrActa_final.pdfVersión final (acceso restringido)653,73 kBAdobe PDFOpen    Request a copy
Thumbnail2015_Rizo_etal_ElectrActa_preprint.pdfPreprint (acceso abierto)304,77 kBAdobe PDFOpen Preview

Items in RUA are protected by copyright, with all rights reserved, unless otherwise indicated.