Interfacial water reorganization as a pH-dependent descriptor of the hydrogen evolution rate on platinum electrodes

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Title: Interfacial water reorganization as a pH-dependent descriptor of the hydrogen evolution rate on platinum electrodes
Authors: Ledezma-Yanez, Isis | Wallace, W. David Z. | Sebastián, Paula | Climent, Victor | Feliu, Juan M. | Koper, Marc T.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: Hydrogen evolution | Platinum electrodes | Electrocatalysis | pH-dependent | Pt(111)
Knowledge Area: Química Física
Issue Date: 20-Mar-2017
Publisher: Macmillan Publishers
Citation: Nature Energy. 2017, 2: 17031. doi:10.1038/nenergy.2017.31
Abstract: Hydrogen evolution on platinum is a key reaction for electrocatalysis and sustainable energy storage, yet its pH-dependent kinetics are not fully understood. Here we present a detailed kinetic study of hydrogen adsorption and evolution on Pt(111) in a wide pH range. Electrochemical measurements show that hydrogen adsorption and hydrogen evolution are both slow in alkaline media, consistent with the observation of a shift in the rate-determining step for hydrogen evolution. Adding nickel to the Pt(111) surface lowers the barrier for hydrogen adsorption in alkaline solutions and thereby enhances the hydrogen evolution rate. We explain these observations with a model that highlights the role of the reorganization of interfacial water to accommodate charge transfer through the electric double layer, the energetics of which are controlled by how strongly water interacts with the interfacial field. The model is supported by laser-induced temperature-jump measurements. Our model sheds light on the origin of the slow kinetics for the hydrogen evolution reaction in alkaline media.
Sponsor: This work was supported by a TOP grant from the Netherlands Organization for Scientific Research (NWO). Support from MINECO (Spain) through project CTQ2013-44083-P is acknowledged.
ISSN: 2058-7546
DOI: 10.1038/nenergy.2017.31
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2017 Macmillan Publishers Limited, part of Springer Nature
Peer Review: si
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Appears in Collections:INV - EQSUP - Artículos de Revistas

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