| Autor: |
Ziegelbauer, J. M., Gatewood, D., Gullá, A. F., Ramaker, D. E., Mukerjee, S. |
| Zdroj: |
Electrochemical and Solid State Letters; September 2006, Vol. 9 Issue: 9 |
| Abstrakt: |
The prototype chalcogenide electrocatalyst RhxSywas probed in situ via a synchrotron-based X-ray absorption near-edge structure (XANES) technique to elucidate specific sites and modes of water activation during oxygen reduction reaction. X-ray diffraction revealed a mixture of phases (Rh2S3, Rh3S4, and Rh17S15). Theoretically generated XANES on a variety of geometries of O(H)adsorption on the predominant Rh3S4phase were compared to the experimental data. We show for the first time that the electrocatalyst first adsorbs O(H)in a onefold configuration at lower potentials and n-fold at potentials greater than 0.80V. This expectedly has important consequences for oxygen reduction reaction on alternative chalcogenide materials. |
| Databáze: |
Supplemental Index |
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