Journal
APPLIED SURFACE SCIENCE
Volume 574, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.151647
Keywords
SMSI effect; Electronic factor; NAP-XPS; UPS; DFT
Categories
Funding
- CNPq
- CAPES [001]
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This study utilized NAP-XPS, UPS, and DFT calculations to investigate the electronic factor of the SMSI effect in Pd/TiO2 nanoparticles, revealing charge transfer from Pd nanoparticles to TiO2 support through Pd-O-Ti entities at the Pd-TiO2 interface during reduction treatment at 300 degrees C.
Whereas observed and explored for over 40 years, there are still open questions regarding the nature of the Strong Metal-Support Interaction (SMSI) effect. The lack of a precise determination of the atomic mechanisms of electronic and geometrical factors of the SMSI effect hinders the application of metal-support systems towards several catalytic reactions. The present study sheds light on the electronic factor of the SMSI effect in Pd/TiO2 nanoparticles by using Near Ambient Pressure Photoelectron Spectroscopy (NAP-XPS), Ultraviolet Photoelectron Spectroscopy (UPS), and Density Functional Theory (DFT) calculations. The electronic and geometrical factor of the SMSI effect were observed during reduction treatment at 300 degrees C and 500 degrees C, respectively. The results enable mapping the electronic factor during reduction treatment at 300 degrees C, where a charge transfer from Pd nanoparticles to TiO2 support through Pd-O-Ti entities existing at the Pd-TiO2 interface is observed. Furthermore, the charge transfer is mediated by O p states present at the Pd-TiO2 interface.
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