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    Tuning the Electronic Structure of Titanium Oxide Support to Enhance the Electrochemical Activity of Platinum Nanoparticles

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    Type
    Article
    Authors
    Shi, Feifei
    Baker, L. Robert
    Hervier, Antoine
    Somorjai, Gabor A.
    Komvopoulos, Kyriakos
    Date
    2013-08-13
    Online Publication Date
    2013-08-13
    Print Publication Date
    2013-09-11
    Permanent link to this record
    http://hdl.handle.net/10754/599844
    
    Metadata
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    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.
    Citation
    Shi F, Baker LR, Hervier A, Somorjai GA, Komvopoulos K (2013) Tuning the Electronic Structure of Titanium Oxide Support to Enhance the Electrochemical Activity of Platinum Nanoparticles. Nano Lett 13: 4469–4474. Available: http://dx.doi.org/10.1021/nl402392u.
    Sponsors
    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. TiO<INF>x</INF> 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.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/nl402392u
    PubMed ID
    23924204
    ae974a485f413a2113503eed53cd6c53
    10.1021/nl402392u
    Scopus Count
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