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The interplay of structure, activity and stability - A case study on AgPt/Pt(111) surface alloys

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Erstveröffentlichung
2020-12-18
Authors
Beckord, Stephan
Referee
Behm, Rolf Jürgen
Groß, A.
Dissertation


Faculties
Fakultät für Naturwissenschaften
Institutions
Institut für Oberflächenchemie und Katalyse
Abstract
In the present thesis structurally well-defined bimetallic model electrodes consisting of AgPt/Pt(111) surface alloys were systematically investigated with a newly developed combination of UHV-STM and electro-catalytic/-chemical studies in an electrochemical flow cell set-up. First, their electrochemical properties and their stability and restructuring upon exposure to an electrochemical environment were analysed, based on a systematic evaluation of bimetallic monolayer surface alloys with increasing Ag surface content. Second, the ORR activities of the bimetallic surface electrodes were studied and correlated with the exact atomic distribution of the surface, including comparison with a kinetic model based on a Sabatier-type analysis. Third, the stability and corrosion of AgPt/Pt(111) surface alloys in dependence on the upper potential limit in electrochemical experiments was characterized. The results of these studies clearly demonstrate the extent and level of detail of information and mechanistic insights gained on the corrosive modification of bimetallic surfaces, which are a precondition for deriving structure-activity relationships. Furthermore, they show the level of measurement accuracy, which is necessary for the interpretation of the electrocatalytic properties of (bimetallic) electrodes for ORR studies.
Date created
2020
Cumulative dissertation containing articles
• doi:10.1039/C6CP06051J
• doi:10.1016/j.electacta.2017.10.146
• doi:10.1021/acs.jpcc.6b00528
• doi:10.1016/j.jelechem.2017.11.038
Subject headings
[GND]: Rastertunnelmikroskopie | Elektrochemie | Oberflächenchemie
[LCSH]: Electrochemistry | Bimetallism | Surface chemistry
[Free subject headings]: STM | Cyclic voltammetry | Bimetallic surfaces | Surface alloys | Oxygen reduction reaction | Ultra high vacuum
[DDC subject group]: DDC 540 / Chemistry & allied sciences
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https://oparu.uni-ulm.de/xmlui/license_v3

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DOI & citation

Please use this identifier to cite or link to this item: http://dx.doi.org/10.18725/OPARU-34143

Beckord, Stephan (2020): The interplay of structure, activity and stability - A case study on AgPt/Pt(111) surface alloys. Open Access Repositorium der Universität Ulm und Technischen Hochschule Ulm. Dissertation. http://dx.doi.org/10.18725/OPARU-34143
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