Elucidating interfacial parameters of platinum–palladium bulk alloy single crystals

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Title: Elucidating interfacial parameters of platinum–palladium bulk alloy single crystals
Authors: Melle, Gabriel | Scholten, Fabian | Feliu, Juan M. | Herrero, Enrique | Roldan Cuenya, Beatriz | Arán-Ais, Rosa 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: Platinum-palladium bulk alloy | Single-crystal electrodes | Interfacial parameters
Issue Date: 14-May-2024
Publisher: Royal Society of Chemistry
Citation: Journal of Materials Chemistry A. 2024. https://doi.org/10.1039/D4TA01771D
Abstract: The application of mixed catalysts in chemical to electrical energy transformation reactions can be a strategy for enhancing the catalysis of these reactions. Platinum and palladium exhibit significant catalytic activity in reactions of different natures, influenced not only by composition but also by structure. The present work presents a fundamental study of the characterization and electrochemical behavior of platinum-palladium bulk alloy single-crystal electrodes (Pt100−xPdx), prepared via a modified Clavilier protocol. Electrodes with varying mass ratios of Pt and Pd, compositions ranging from 0 to 15% Pd, and crystallographic orientations of (111) and (100) were manufactured. X-ray photoelectron spectroscopy (XPS) and low-energy electron diffraction (LEED) reveal a well-correlated bulk and surface composition with ordered crystalline structures. Cyclic voltammetry in HClO4 and H2SO4 electrolytes indicates stronger anion interactions compared to pure platinum. Charge displacement experiments by CO adsorption estimate the effect of surface orientation and Pd content on the potential zero total charge (pztc). For Pt100−xPdx(111) surfaces, the pztc is very close to that of Pt(111), while surfaces with (100) orientation show decreasing pztc values with higher Pd content, favoring OH adsorption at lower potentials. Finally, the CO oxidation reaction on these Pt–Pd bulk alloy electrodes is studied by cyclic voltammetry, providing a profoundly comparative discussion of this reaction with Pt(111), Pt(100), and Pt(111) modified with Pd sub-monolayers.
Sponsor: The authors thank the funding by the Max Planck Society through the funding of the Max Planck Partner Group on “Mechanistic insights into electrocatalytic reactions on well-defined bimetallic surfaces”. Financial support from the Ministerio de Ciencia e Innovación (project PID2022-137350NB-I00) is also acknowledged.
URI: http://hdl.handle.net/10045/143341
ISSN: 2050-7488 (Print) | 2050-7496 (Online)
DOI: 10.1039/D4TA01771D
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
Publisher version: https://doi.org/10.1039/D4TA01771D
Appears in Collections:INV - EQSUP - Artículos de Revistas

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