Activation Energy of Hydrogen Adsorption on Pt(111) in Alkaline Media: An Impedance Spectroscopy Study at Variable Temperatures
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http://hdl.handle.net/10045/109533
Title: | Activation Energy of Hydrogen Adsorption on Pt(111) in Alkaline Media: An Impedance Spectroscopy Study at Variable Temperatures |
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Authors: | Botello, Luis | Feliu, Juan M. | Climent, Victor |
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: | Hydrogen | Adsorption | Electrochemistry | Activation energy | Impedance | Platinum | Single crystal | Alkaline media |
Knowledge Area: | Química Física |
Issue Date: | 24-Aug-2020 |
Publisher: | American Chemical Society |
Citation: | ACS Applied Materials & Interfaces. 2020, 12(38): 42911-42917. https://doi.org/10.1021/acsami.0c13158 |
Abstract: | The hydrogen evolution reaction is one of the most studied processes in electrochemistry, and platinum is by far the best catalyst for this reaction. Despite the importance of this reaction on platinum, detailed and accurate kinetic measurements of the steps that lead to the main reaction are still lacking, particularly because of the fast rate of the reaction. Hydrogen adsorption on Pt(111) has been taken as a benchmark system in a large number of computational studies, but reliable experimental data to compare with the computational studies is very scarce. To gain further knowledge on this matter, a temperature study of the hydrogen adsorption reaction has been carried out to obtain kinetic information for this process on Pt(111) in alkaline solution. This was achieved by measuring electrochemical impedance spectra and cyclic voltammograms in the range of 278 ≤ T ≤ 318 (K) to obtain the corresponding surface coverage by adsorbed species and the faradaic charge transfer resistance. From this data, the standard rate constant has been extracted with a kinetic model assuming a Frumkin-type isotherm, resulting in values of 2.60 × 10–7 ≤ k0 ≤ 1.68 × 10–6 (s–1). The Arrehnius plot gives an activation energy of 32 kJ mol–1. Comparisons are made with values calculated by computational methods and reported values for the overall HER, giving a reference frame to support future studies on hydrogen catalysis. |
Sponsor: | This work was financially supported by the MINECO (Spain) project no. CTQ2016-76221-P. L.E.B. thanks the Generalitat Valenciana for funding from the Santiago Grisolia Program (no. GRISOLIAP/2017/181). |
URI: | http://hdl.handle.net/10045/109533 |
ISSN: | 1944-8244 (Print) | 1944-8252 (Online) |
DOI: | 10.1021/acsami.0c13158 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2020 American Chemical Society |
Peer Review: | si |
Publisher version: | https://doi.org/10.1021/acsami.0c13158 |
Appears in Collections: | INV - EQSUP - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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Botello_etal_2020_ACSApplMaterInterfaces_final.pdf | Versión final (acceso restringido) | 1,09 MB | Adobe PDF | Open Request a copy |
Botello_etal_2020_ACSApplMaterInterfaces_accepted.pdf | Accepted Manuscript (acceso abierto) | 3,57 MB | Adobe PDF | Open Preview |
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