In Situ Stability Studies of Platinum Nanoparticles Supported on Ruthenium−Titanium Mixed Oxide (RTO) for Fuel Cell Cathodes
| Autor: | Peter Strasser, Karl Johann Jakob Mayrhofer, Stefanie Kühl, Vijay Ramani, Elisabeth Hornberger, Serhiy Cherevko, Jakub Drnec, Henrike Schmies, Daniel J. S. Sandbeck, Guanxiong Wang, Arno Bergmann |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Platinum nanoparticles Electrochemistry Electrocatalyst 01 natural sciences Catalysis 0104 chemical sciences Ruthenium chemistry Chemical engineering Mixed oxide 0210 nano-technology Dissolution Titanium |
| Zdroj: | ACS Catalysis. 8:9675-9683 |
| ISSN: | 2155-5435 |
| Popis: | Using a variety of in situ techniques, we tracked the structural stability and concomitantly the electrocatalytic oxygen reduction reaction (ORR) of platinum nanoparticles on ruthenium–titanium mixed oxide (RTO) supports during electrochemical accelerated stress tests, mimicking fuel cell operating conditions. High-energy X-ray diffraction (HE-XRD) offered insights in the evolution of the morphology and structure of RTO-supported Pt nanoparticles during potential cycling. The changes of the atomic composition were tracked in situ using scanning flow cell measurements coupled to inductively coupled plasma mass spectrometry (SFC-ICP-MS). We excluded Pt agglomeration, particle growth, dissolution, or detachment as cause for the observed losses in catalytic ORR activity. Instead, we argue that Pt surface poisoning is the most likely cause of the observed catalytic rate decrease. Data suggest that the gradual growth of a thin oxide layer on the Pt nanoparticles due to strong metal–support interaction (SMSI) is... |
| Databáze: | OpenAIRE |
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