New probes to surface free charge at electrochemical interfaces with platinum electrodes

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Title: New probes to surface free charge at electrochemical interfaces with platinum electrodes
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: Platinum electrodes | Electrochemical interfaces | Free charge
Knowledge Area: Química Física
Issue Date: Apr-2019
Publisher: Elsevier
Citation: Current Opinion in Electrochemistry. 2019, 14: 16-22. doi:10.1016/j.coelec.2018.09.012
Abstract: The free charge is a key variable dominating the properties of the interphase between a metallic electrode and an electrolytic solution. However, its determination in the case of platinum electrodes is not straightforward. Here, we review some of the experimental and computational strategies that can be used to gain information about the free charge in these interphases. First, we discuss the influence of the free charge on some reactions of technological interest. Then, we demonstrate the usefulness of peroxodisulfate (PDS) reduction as a probe reaction sensitive to the free charge on platinum electrodes. The comparison with other strategies, based on either CO displacement, measurements of the potential of maximum entropy of the interphase or N2O reduction, validates the consistency of this approach. Finally, it is remarked how the use of PDS reduction as a surface probe evidences the existence of a non-monotonic behavior in the variation of the charge as a function of potential on platinum electrodes.
Sponsor: Work supported by the MCINN (FEDER) (Spain), through project CTQ2016-76221-P.
ISSN: 2451-9103 (Print) | 2451-9111 (Online)
DOI: 10.1016/j.coelec.2018.09.012
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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