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Charge polarization and quantum trapping in AgPd and CuPd bimetallic alloy catalysts
Sun Changqing * #
School of Electrical and Electronic Engineering, Nanyang technological University
*Correspondence author
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Funding: none
Opened online:26 August 2009
Accepted by: none
Citation: Sun Changqing.Charge polarization and quantum trapping in AgPd and CuPd bimetallic alloy catalysts[OL]. [26 August 2009] http://en.paper.edu.cn/en_releasepaper/content/34655
 
 
AgPd and CuPd alloys are important catalysts that perform very differently with physical origins being still undetermined. Using X-ray photoelectron spectroscopy we examined the density-of-states evolution of the valence and the Cu 2p, Ag 3d, and Pd 3d core bands during the alloying process of ultrathin Cu and Ag films deposited separately on Pd substrates. We found that the valence and the core electrons of the CuPd alloy shift positively, opposite to the occurrences in the AgPd alloy catalyst. This finding may distinguish the CuPd from the AgPd in the catalytic reactions, indicating that CuPd serves as an acceptor due to quantum trapping and the AgPd as a donor because of charge polarization.
Keywords:AgPd;CuPd;Bimetallic alloy;Catalysis;Interface;XPS
 
 
 

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