On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes

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Title: On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
Authors: Ganassin, Alberto | Sebastián, Paula | Climent, Victor | Schuhmann, Wolfgang | Bandarenka, Aliaksandr S. | 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: pH dependence | Potential of maximum entropy | Ir(111) electrodes
Knowledge Area: Química Física
Issue Date: 28-Apr-2017
Publisher: Springer Nature
Citation: Scientific Reports. 2017, 7: 1246. doi:10.1038/s41598-017-01295-1
Abstract: Studies over the entropy of components forming the electrode/electrolyte interface can give fundamental insights into the properties of electrified interphases. In particular, the potential where the entropy of formation of the double layer is maximal (potential of maximum entropy, PME) is an important parameter for the characterization of electrochemical systems. Indeed, this parameter determines the majority of electrode processes. In this work, we determine PMEs for Ir(111) electrodes. The latter currently play an important role to understand electrocatalysis for energy provision; and at the same time, iridium is one of the most stable metals against corrosion. For the experiments, we used a combination of the laser induced potential transient to determine the PME, and CO charge-displacement to determine the potentials of zero total charge, (EPZTC). Both PME and EPZTC were assessed for perchlorate solutions in the pH range from 1 to 4. Surprisingly, we found that those are located in the potential region where the adsorption of hydrogen and hydroxyl species takes place, respectively. The PMEs demonstrated a shift by ~30 mV per a pH unit (in the RHE scale). Connections between the PME and electrocatalytic properties of the electrode surface are discussed.
Sponsor: We acknowledge financial support from the Deutsche Forschungsgemeinschaft (DFG) in the framework of the cluster of excellence “Resolv” (EXC1069). This work was supported by the German Research Foundation (DFG) and the Technical University of Munich (TUM) in the framework of the Open Access Publishing Program.
URI: http://hdl.handle.net/10045/71530
ISSN: 2045-2322
DOI: 10.1038/s41598-017-01295-1
Language: eng
Type: info:eu-repo/semantics/article
Rights: Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Peer Review: si
Publisher version: http://dx.doi.org/10.1038/s41598-017-01295-1
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