期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 12, 期 21, 页码 5694-5700出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b926414k
关键词
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资金
- Division of Materials Sciences and Engineering, Office of Basic Energy Sciences, US Department of Energy
- President's Hydrogen Fuel Initiative
- Swedish national research council
- Ministry of Education, Culture, Sports, Science and Technology [2007A2005, 2008A1671/BL-47XU]
- Swedish NSC
- German National Science Foundation
We demonstrate the successful use of hard X-ray photoelectron spectroscopy (HAXPES) for selectively probing the platinum partial d-density of states (DOS) in a Pt-Cu nanoparticle catalyst which shows activity superior to pure Pt towards the oxygen-reduction reaction (ORR). The information about occupied Pt d-band states was complemented by Pt L-2-edge X-ray absorption near-edge spectroscopy (XANES), which probes unoccupied valence states. We found a significant electronic perturbation of the Pt projected d-DOS which was narrowed and shifted to higher binding energy compared to pure platinum. The effect of this electronic structure perturbation on the chemical properties of the nanoparticle surface is discussed in terms of the d-band model. We have thereby demonstrated that the combination of L-edge spectroscopy and HAXPES allows for an experimental derivation of the valence electronic structure in an element-specific way for 5d metal catalysts.
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