Oxygen Binding to Active Sites of Fe–N–C ORR Electrocatalysts Observed by Ambient-Pressure XPS
| Autor: | Ivana Matanovic, Kateryna Artyushkova, Plamen Atanassov, Barr Halevi |
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| Rok vydání: | 2017 |
| Předmět: |
In situ
Chemistry Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Nitrogen 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy X-ray photoelectron spectroscopy Core level Fuel cells Physical and Theoretical Chemistry 0210 nano-technology Absorption (electromagnetic radiation) Oxygen binding Ambient pressure |
| Zdroj: | The Journal of Physical Chemistry C. 121:2836-2843 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | We report the first in situ ambient pressure X-ray photoelectron spectroscopy (APXPS) study of the binding of oxygenated species to the active sites of iron–nitrogen–carbon oxygen reduction reaction (ORR) electrocatalysts. To better interpret the results, DFT calculations were used to calculate absorption energies of reactants and intermediates on potential active sites and calculate the core level shifts for those. The observed oxygen binding to nitrogen coordinated to iron centers correlates with the enhanced measured ORR fuel cell activity of these materials with respect to metal-free analogs and sheds light on the ORR mechanism on PGM-free electrocatalysts. |
| Databáze: | OpenAIRE |
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