Abstract
Two times higher activity and three times higher stability in methanol oxidation reaction, a 0.12 V negative shift of the CO oxidation peak potential, and a 0.07 V positive shift of the oxygen reaction potential compared to Pt nanoparticles on pristine TiO2 support were achieved by tuning the electronic structure of the titanium oxide support of Pt nanoparticle catalysts. This was accomplished by adding oxygen vacancies or doping with fluorine. Experimental trends are interpreted in the context of an electronic structure model, showing an improvement in electrochemical activity when the Fermi level of the support material in Pt/TiOx systems is close to the Pt Fermi level and the redox potential of the reaction. The present approach provides guidance for the selection of the support material of Pt/TiOx systems and may be applied to other metal-oxide support materials, thus having direct implications in the design and optimization of fuel cell catalyst supports. © 2013 American Chemical Society.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 4469-4474 |
| Number of pages | 6 |
| Journal | Nano Letters |
| Volume | 13 |
| Issue number | 9 |
| DOIs | |
| State | Published - Aug 13 2013 |
| Externally published | Yes |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: The authors thank Dr. Philip N. Ross, Jr., for helpful discussions on elertocatalysis, Zhongwei Zhu for assistance in XPS spectra acquisition, and Yimin Li and Hailiang Wang for fruitful discussions. TiOx film deposition was carried out at the Marvell Nano Lab, University of California, Berkeley (UCB). SEM and XPS studies were carried out at the Molecular Foundry, Lawrence Berkeley National Laboratory. This research was supported by the UCB-KAUST Academic Excellence Alliance (AEA) Program.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.