Characterization of Ligand Effects on Water Activation in Triarylphosphine-Stabilized Pt Nanoparticle Catalysts by X-ray Absorption Spectroscopy
| Autor: | † and Karen E. Swider-Lyons, Terence L. Schull, Olga A. Baturina, Jeremy J. Pietron, Yannick Garsany, David E. Ramaker, Daniel Gatewood |
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| Rok vydání: | 2008 |
| Předmět: |
X-ray absorption spectroscopy
Extended X-ray absorption fine structure Absorption spectroscopy Inorganic chemistry Electrochemistry Electrocatalyst XANES Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound General Energy chemistry Physical and Theoretical Chemistry Triphenylphosphine |
| Zdroj: | The Journal of Physical Chemistry C. 112:4961-4970 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp709588c |
| Popis: | The synthesis, preparation, and electrochemical characterization of triphenylphosphine triphosphonate (TPPTP) stabilized Pt particles have been reported previously with the observation that the TPPTP ligands increase the specific activity of Pt for the oxygen reduction reaction (ORR). In this work the ORR activity of the Pt/TPPTP electrocatalyst is probed by analyzing water activation with Pt L3-edge X-ray absorption spectroscopy and the EXAFS and Delta XANES analysis techniques. The results are compared with that for similarly prepared Pt/C and Pt stabilized by an oxidized TPPTP ligand (Pt/ox-TPPTP). The Pt particles in the Pt/TPPTP catalyst at 0.54 V (RHE) are complexed via the P (i.e., Pt−P |
| Databáze: | OpenAIRE |
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