Electrocatalysis with Atomically Defined Model Systems: Metal–Support Interactions between Pt Nanoparticles and Co3O4(111) under Ultrahigh Vacuum and in Liquid Electrolytes
- Firas FaisalFiras FaisalLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Firas Faisal
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- Manon BertramManon BertramLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Manon Bertram
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- Corinna StummCorinna StummLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Corinna Stumm
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- Tobias WählerTobias WählerLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Tobias Wähler
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- Ralf SchusterRalf SchusterLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Ralf Schuster
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- Yaroslava LykhachYaroslava LykhachLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Yaroslava Lykhach
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- Armin NeitzelArmin NeitzelLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Armin Neitzel
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- Tomáš SkálaTomáš SkálaFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, 18000 Prague, Czech RepublicMore by Tomáš Skála
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- Nataliya TsudNataliya TsudFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, 18000 Prague, Czech RepublicMore by Nataliya Tsud
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- Klára BeranováKlára BeranováElettra-Sincrotrone Trieste SCpA and IOM, Strada Statale 14, km 163.5, 34149 Basovizza-Trieste, ItalyMore by Klára Beranová
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- Kevin C. PrinceKevin C. PrinceElettra-Sincrotrone Trieste SCpA and IOM, Strada Statale 14, km 163.5, 34149 Basovizza-Trieste, ItalyMore by Kevin C. Prince
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- Vladimír MatolínVladimír MatolínFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University, V Holešovičkách 2, 18000 Prague, Czech RepublicMore by Vladimír Matolín
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- Olaf Brummel*Olaf Brummel*(O.B.) E-mail [email protected]Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyMore by Olaf Brummel
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- Jörg LibudaJörg LibudaLehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, D-91058 Erlangen, GermanyErlangen Catalysis Resource Center and Interdisciplinary Center Interface Controlled Processes, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyMore by Jörg Libuda
Abstract
Electronic metal–support interactions play a key role in the design of heterogeneous catalysts, as they provide a tool for tuning catalytic properties and enhancing catalyst stability. In this work, we explore the role of metal–support interactions in electrocatalysis using a model approach. We investigate the adsorption and reaction behavior of atomically defined Pt/Co3O4 model catalysts under ultrahigh vacuum (UHV) and under electrochemical conditions. The model systems were prepared by physical vapor deposition (PVD) of Pt onto well-ordered Co3O4(111) films on Ir(100), varying the average Pt nanoparticle (NP) size between 10 and 500 atoms per NP. In UHV, the model catalysts were characterized by synchrotron radiation photoelectron spectroscopy (SRPES), temperature-programmed desorption (TPD), and infrared reflection–absorption spectroscopy (IRAS). By SRPES, we show that partially oxidized Ptδ+ species are formed at the interface with the Co3O4 support. CO adsorbs weakly on these Ptδ+ sites and can be identified by IRAS at 115 K. Upon heating, CO adsorbed on metallic Pt0 reacts with oxygen released from Co3O4 and gives rise to CO2 between 450 and 500 K. As a result of oxygen depletion, the Ptδ+ at the NP interface is reduced to Pt0. Subsequently, we investigated the adsorption and oxidation of CO under electrochemical conditions on the same Pt/Co3O4 model catalysts. After preparation and characterization in UHV, the model systems were transferred into the electrochemical environment without exposure to ambient conditions. CO adsorption and electrooxidation were performed under conditions where the model system is stable (pH 10, 0.33–1.03 VRHE, phosphate buffer). By electrochemical infrared reflection–absorption spectroscopy (EC-IRRAS), we show that CO does not adsorb at the partially oxidized Ptδ+ sites in the electrolyte at 300 K. Nevertheless, the Ptδ+ species at the NP/oxide interface is reduced to Pt0 upon repeated experimental cycles. This effect increases with decreasing NP size, in line with the behavior observed under UHV conditions. Our findings suggest that electronic metal–support interactions in metal/oxide catalysts play a very similar role in reactions with gaseous reactants and at the electrified interface.
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