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

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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).
URI: http://hdl.handle.net/10045/53176
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: http://dx.doi.org/10.1016/j.electacta.2015.01.069
Appears in Collections:INV - EQSUP - Artículos de Revistas

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