Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts
- Selective deposition of Pt onto supported metal clusters for fuel cell electrocatalysts
- 전태열; Nicola Pinna; 유성종; 안도천; 최선희; Marc Georg Willinger; 조용훈; 이국승; 박희영; 유승호; 성영은
- fuel cell; core-shell; electrocatalysts
- Issue Date
- VOL 4, NO 20, 6461-6469
- We report a new method for depositing Pt on a metal core to develop real electrocatalysts with significantly reduced amounts of expensive Pt as well as enhanced activity for oxygen reduction reaction. Ru and Pd have different crystal structures and modify the electronic structure of Pt at a different extent (shifts in d-band center). They were chosen as core materials to examine whether hydroquinone dissolved in ethanol can be used to deposit additional Pt atoms onto preformed core nanoparticles, and whether the modified d-character of Pt on different host metals can result in the enhanced ORR activity. The physicochemical characteristics of Pd-Pt and Ru-Pt core-shell nanoparticles are investigated. The coreshell structure was identified through a combination of experimental methods, employing electron microscopy, electrochemical, and synchrotron X-ray measurements such as powder X-ray diffraction, Xray absorption fine structure, and X-ray photoelectron spectroscopy. The hydroquinone reduction method proved to be an excellent route for the epitaxial growth of a Pt shell onto the metal cores, leading to
enhanced ORR activities.
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