Adatoms quantum trapping and polarization at Pt and Rh surfaces
首发时间:2009-08-27
Abstract:The extremely-high catalytic efficiency of under-coordinated metal adatoms is indeed fascinating but its electronic origin remains yet puzzling. Incorporating the BOLS correlation theory into the high-resolution XPS measurements has affirmed the BOLS expectations that the broken bonds induce local strain and quantum trapping in addition to polarization of the otherwise conductive half-filled s-shell charge by the tightly- and densely-trapped inner electrons of the adatoms. Both the trapped and polarized states would be detectable from the density-of-states evolution of the valence and the core bands. The trapped states have been discovered at the bottom edges of Pt(5d106s0) 4f7/2 and Rh 3d5/2 bands and the polarized states only present at the upper edge of Rh(4d85s1) 3d5/2. It is suggested that the quantum trapping will increase the electroaffinity and the polarization do oppositely. Therefore, the Rh adatom may serve as a donor and the Pt adatom as an acceptor in the process of catalytic reaction.
keywords: Catalytic electronics Pt Rh,adatoms XPS
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Adatoms quantum trapping and polarization at Pt and Rh surfaces
摘要:The extremely-high catalytic efficiency of under-coordinated metal adatoms is indeed fascinating but its electronic origin remains yet puzzling. Incorporating the BOLS correlation theory into the high-resolution XPS measurements has affirmed the BOLS expectations that the broken bonds induce local strain and quantum trapping in addition to polarization of the otherwise conductive half-filled s-shell charge by the tightly- and densely-trapped inner electrons of the adatoms. Both the trapped and polarized states would be detectable from the density-of-states evolution of the valence and the core bands. The trapped states have been discovered at the bottom edges of Pt(5d106s0) 4f7/2 and Rh 3d5/2 bands and the polarized states only present at the upper edge of Rh(4d85s1) 3d5/2. It is suggested that the quantum trapping will increase the electroaffinity and the polarization do oppositely. Therefore, the Rh adatom may serve as a donor and the Pt adatom as an acceptor in the process of catalytic reaction.
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Adatoms quantum trapping and polarization at Pt and Rh surfaces
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