Peroxodisulfate reduction as a probe to interfacial charge

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Title: Peroxodisulfate reduction as a probe to interfacial charge
Authors: Martínez-Hincapié, Ricardo | 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: Potential of zero charge | Free charge | Peroxodisulfate reduction | Nitrous oxide reduction | Platinum single crystal electrode
Knowledge Area: Química Física
Issue Date: Mar-2018
Publisher: Elsevier
Citation: Electrochemistry Communications. 2018, 88: 43-46. doi:10.1016/j.elecom.2018.01.012
Abstract: Peroxodisulfate reduction has been investigated on Pt(111) on a broad range of pH values as a way to test interfacial charge. The reaction always proceeds in a potential window that is almost pH independent, regardless of changes in the presence of adsorbed species. Comparison with other available information for these interphases allows to conclude that this reaction is very sensitive to the free charge on the metal, being inhibited when the latter is negative. This explains the complete current inhibition when the potential is lower than the potential of zero free charge. Most remarkably, the inhibition at high potentials can be related to the existence of a second potential of zero charge, above which the surface becomes again negatively charged. This conclusion agrees with classical results for polycrystalline platinum (which has been reexamined), results from laser induced T-jump experiments and recent theoretical models of the interphase. In this way, this reaction is postulated as a new probe to locate the values of the potential of zero free charge.
Sponsor: The authors thankfully acknowledge financial support from the Ministerio de Economía, Industria y Competitividad (Spain) through project CTQ2016-76221-P.
ISSN: 1388-2481 (Print) | 1873-1902 (Online)
DOI: 10.1016/j.elecom.2018.01.012
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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