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Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal–Support Interaction and Stability
- Manon BertramManon BertramInterface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Manon Bertram
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- Carolin PrösslCarolin PrösslHelmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstraße 3, 91058 Erlangen, GermanyDepartment of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyMore by Carolin Prössl
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- Michal RonovskýMichal RonovskýFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Michal Ronovský
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- Julius KnöppelJulius KnöppelHelmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstraße 3, 91058 Erlangen, GermanyDepartment of Chemical and Biological Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, GermanyMore by Julius Knöppel
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- Peter MatvijaPeter MatvijaFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Peter Matvija
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- Lukáš FusekLukáš FusekFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Lukáš Fusek
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- Tomáš SkálaTomáš SkálaFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 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 Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Nataliya Tsud
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- Maximilian KastenmeierMaximilian KastenmeierInterface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Maximilian Kastenmeier
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- Vladimír MatolínVladimír MatolínFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Vladimír Matolín
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- Karl J. J. MayrhoferKarl J. J. MayrhoferHelmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Karl J. J. Mayrhofer
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- Viktor JohánekViktor JohánekFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Viktor Johánek
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- Josef MyslivečekJosef MyslivečekFaculty of Mathematics and Physics, Department of Surface and Plasma Science, Charles University,V Hole šovičkách 2, 18000 Prague, Czech RepublicMore by Josef Mysliveček
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- Serhiy CherevkoSerhiy CherevkoHelmholtz-Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich GmbH, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Serhiy Cherevko
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- Yaroslava LykhachYaroslava LykhachInterface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Yaroslava Lykhach
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- Olaf Brummel*Olaf Brummel*[email protected]Interface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Olaf Brummel
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- Jörg LibudaJörg LibudaInterface Research and Catalysis, ECRC, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstraße 3, 91058 Erlangen, GermanyMore by Jörg Libuda
Abstract
Oxide supports can modify and stabilize platinum nanoparticles (NPs) in electrocatalytic materials. We studied related phenomena on model systems consisting of Pt NPs on atomically defined Co3O4(111) thin films. Chemical states and dissolution behavior of model catalysts were investigated as a function of the particle size and the electrochemical potential by ex situ emersion synchrotron radiation photoelectron spectroscopy and by online inductively coupled plasma mass spectrometry. Electronic metal–support interaction (EMSI) yields partially oxidized Ptδ+ species at the metal/support interface of metallic nanometer-sized Pt NPs. In contrast, subnanometer particles form Ptδ+ aggregates that are exclusively accompanied by subsurface Pt4+ species. Dissolution of Cox+ ions is strongly coupled to the presence of Ptδ+ and the reduction of subsurface Pt4+ species. Our findings suggest that EMSI directly affects the integrity of oxide-based electrocatalysts and may be employed to stabilize Pt NPs against sintering and dissolution.
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