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

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...

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Main Authors:	Alberto Ganassin, Paula Sebastián, Víctor Climent, Wolfgang Schuhmann, Aliaksandr S. Bandarenka, Juan Feliu
Format:	article
Language:	EN
Published:	Nature Portfolio 2017
Subjects:	Medicine R Science Q
Online Access:	https://doaj.org/article/d2ff4c8b51d943a6ae5fd965d031ad71
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spelling	oai:doaj.org-article:d2ff4c8b51d943a6ae5fd965d031ad712021-12-02T16:07:02ZOn the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes10.1038/s41598-017-01295-12045-2322https://doaj.org/article/d2ff4c8b51d943a6ae5fd965d031ad712017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01295-1https://doaj.org/toc/2045-2322Abstract 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.Alberto GanassinPaula SebastiánVíctor ClimentWolfgang SchuhmannAliaksandr S. BandarenkaJuan FeliuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Alberto Ganassin Paula Sebastián Víctor Climent Wolfgang Schuhmann Aliaksandr S. Bandarenka Juan Feliu On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
description	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.
format	article
author	Alberto Ganassin Paula Sebastián Víctor Climent Wolfgang Schuhmann Aliaksandr S. Bandarenka Juan Feliu
author_facet	Alberto Ganassin Paula Sebastián Víctor Climent Wolfgang Schuhmann Aliaksandr S. Bandarenka Juan Feliu
author_sort	Alberto Ganassin
title	On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
title_short	On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
title_full	On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
title_fullStr	On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
title_full_unstemmed	On the pH Dependence of the Potential of Maximum Entropy of Ir(111) Electrodes
title_sort	on the ph dependence of the potential of maximum entropy of ir(111) electrodes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d2ff4c8b51d943a6ae5fd965d031ad71
work_keys_str_mv	AT albertoganassin onthephdependenceofthepotentialofmaximumentropyofir111electrodes AT paulasebastian onthephdependenceofthepotentialofmaximumentropyofir111electrodes AT victorcliment onthephdependenceofthepotentialofmaximumentropyofir111electrodes AT wolfgangschuhmann onthephdependenceofthepotentialofmaximumentropyofir111electrodes AT aliaksandrsbandarenka onthephdependenceofthepotentialofmaximumentropyofir111electrodes AT juanfeliu onthephdependenceofthepotentialofmaximumentropyofir111electrodes
_version_	1718384807808860160

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

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