Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal-Support Interaction and Stability
| Autor: | Peter Matvija, Yaroslava Lykhach, Julius Knöppel, Maximilian Kastenmeier, Manon Bertram, Michal Ronovský, Olaf Brummel, Vladimír Matolín, Karl Johann Jakob Mayrhofer, Viktor Johánek, Tomáš Skála, Josef Mysliveček, Nataliya Tsud, Serhiy Cherevko, Lukáš Fusek, Carolin Prössl, Jörg Libuda |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Oxide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Platinum nanoparticles 01 natural sciences 0104 chemical sciences Metal chemistry.chemical_compound Chemical engineering chemistry visual_art visual_art.visual_art_medium General Materials Science Nanometre ddc:530 Particle size Physical and Theoretical Chemistry 0210 nano-technology Cobalt oxide Dissolution |
| Zdroj: | The journal of physical chemistry letters 11(19), 8365-8371 (2020). doi:10.1021/acs.jpclett.0c02233 |
| ISSN: | 1948-7185 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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