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<dc:title xml:lang="fr">Étude de l'interface platine/électrolyte alcalin via dynamique moléculaire à potentiel constant</dc:title>
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<dc:subject xml:lang="fr">Electrolyte Alcalin</dc:subject>
<dc:subject xml:lang="en">Constant Potential molecular dynamics</dc:subject>
<dc:subject xml:lang="en">Electrochemical double layer</dc:subject>
<dc:subject xml:lang="en">Electrode/Electrolyte interface</dc:subject>
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<dc:subject xml:lang="en">Alkaline electrolyte</dc:subject>
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<tef:elementdEntree autoriteExterne="032060815" autoriteSource="Sudoc">Couche double électrique</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">L’interface électrode/électrolyte est la clé de voute de l’électrocatalyse, pour laquelle – de fait des limites des modèles et des méthodes expérimentales pour permettre son observation – la Dynamique Moléculaire et la DFT peuvent apporter des informations précieuses. Celles-ci sont d’autant plus importantes que de récentes études expérimentales sur la réaction de dégagement de l’hydrogène (HER) sur le Pt ont mis en avant le rôle clé joué par les cations présents à l’interface sur la réactivité du dit Pt. Dans cette thèse, le logiciel MetalWalls a été utilisé pour simuler l’interface entre le Pt et un électrolyte alcalin (1M XOH, X = Cs, Na, K). L’influence des cations a été étudié sur Pt(100) à 0 V et 1 V avec trois cations, révélant des liens entre l’organisation de interface, le comportement de l’eau et la structure électronique des cations. La charge de l’électrode s’est révélée dépendante de la réorganisation de l’électrolyte à &lt; 1 nm de l’électrode. D’autres simulations sur Pt(100), Pt(110) et Pt(111) ont montré que la compacité influence l’adsorption de l’eau et des cations, sans toutefois dominer l’effet de cation. Enfin, une extension du modèle pour les adsorbats d’hydrogène a révélé les limites du modèle, soulignant la nécessité d’un raffinement de la représentation de ces derniers dans la construction des électrodes.</dcterms:abstract>
<dcterms:abstract xml:lang="en">The electrode/electrolyte interface is the cornerstone of electrocatalysis, for which—given the limitations of models and experimental methods for observing it— Molecular Dynamics and DFT can provide valuable information. These are even more pivotal, given that recent experimental studies on the hydrogen evolution reaction (HER) on Pt have highlighted the key role played by the cations present at the interface on the reactivity of Pt. In this thesis, MetalWalls software was used to simulate the interface between Pt and an alkaline electrolyte (1M XOH, X = Cs, Na, K). The influence of cations was studied on Pt(100) at 0 V and 1 V with three cations, revealing links between the interface organization, the behaviour of water, and the electronic structureof the cations. The electrode charge was found to be dependent on the reorganization of the electrolyte at &lt; 1 nm from the electrode. Other simulations on Pt(100), Pt(110), and Pt(111) showed that compactness influences the adsorption of water and cations, without however dominating the cation effect. Finally, an extension of the model for hydrogen adsorbates revealed the limitations of the model, highlighting the need to refine the representation of the latter in the construction of electrodes.</dcterms:abstract>
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