Nanoscale Morphological and Structural Transformations of PtCu Alloy Electrocatalysts during Potentiodynamic Cycling
| Autor: | Ivan Khalakhan, Milan Dopita, Mykhailo Vorokhta, Olaf Brummel, Manon Bertram, Iva Matolínová, Vladimír Matolín, Peter Kúš, Yurii Yakovlev, Jörg Libuda, Fabian Waidhas |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Absorption spectroscopy Alloy Proton exchange membrane fuel cell chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Chemical engineering chemistry engineering Physical and Theoretical Chemistry Thin film 0210 nano-technology Platinum Bimetallic strip |
| Zdroj: | The Journal of Physical Chemistry C. 122:21974-21982 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | PtCu bimetallic alloys are known to provide better activity than pure platinum in proton exchange membrane fuel cells. However, such catalysts undergo complex degradation processes during fuel cell operation, resulting in deterioration of their activity. By using in situ electrochemical (EC) atomic force microscopy combined with in situ EC infrared reflection absorption spectroscopy, we provide a comprehensive investigation of morphological and structural transformations of PtCu model thin film catalysts during accelerated degradation tests (ADTs). The ADTs consist of potentiodynamic cycling to three different upper potentials relevant for different modes of fuel cell operation. The results show that, depending on the upper potential limit, PtCu alloy electrocatalysts are subject to drastic changes in the surface composition, morphology, and structure. |
| Databáze: | OpenAIRE |
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