Pt single crystal surfaces in electrochemistry and electrocatalysis

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Title: Pt single crystal surfaces in electrochemistry and electrocatalysis
Authors: Feliu, Juan M. | Herrero, Enrique
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 single crystal surfaces | Electrochemistry | Electrocatalysis
Issue Date: 20-Nov-2023
Publisher: Royal Society of Chemistry
Citation: EES Catalysis. 2024, 2: 399-410.
Abstract: In this review, recent advances in the use of platinum single-crystal surfaces in electrochemistry are addressed. The starting point is the voltammetric characterization in a supporting electrolyte because the profile can be used as a fingerprint of the surface, allowing the surface quality and solution cleanliness to be established. The signals appearing in these voltammograms have been assigned to the adsorption of H, OH, and the anions in the supporting electrolyte. Then, the distinctive behavior of the Pt(111) electrode regarding the adsorption of species and the electrocatalysis in comparison with the other single-crystal surfaces is discussed. For the H/OH adsorption, the (111) ordered domain is the only one in which both processes appear in different potential windows. For the remaining ordered domains, steps, and kinks, both processes overlap, giving rise to signals that correspond to the competitive adsorption/desorption of OH and H. This fact implies that OH may be adsorbed on the surface at potentials as low as 0.15 V, which is a paradigm shift in the up-to-now prevailing understanding of the electrochemical behavior of platinum electrodes and has important implications for the elucidation of the mechanism of electrocatalytic reactions. The effects of this new knowledge on the proposed reaction mechanisms for the oxidation of CO and small organic molecules and the reduction of oxygen and hydrogen peroxide are discussed in detail. Since the elucidation of the reaction mechanisms requires in many cases the use of computational modeling, the conditions that the models should fulfill to reach valid conclusions are discussed. Relevant examples, which highlight the importance of the local structure of the interphase in the electrochemical behavior are given.
Sponsor: This work has been financially supported by the Ministerio de Ciencia e Innovación (Project PID2022-137350NB-I00), and Generalitat Valenciana (Project PROMETEO/2020/063).
ISSN: 2753-801X
DOI: 10.1039/D3EY00260H
Language: eng
Type: info:eu-repo/semantics/article
Rights: This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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