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Structures and Reactivities of Tin Oxide on Pt(111) Studied by Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS)

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Abstract

The reduction of disordered and ordered tin oxide monolayers and multilayers on Pt(111) by H2 was studied in situ by ambient pressure X-ray photoelectron spectroscopy. The disordered tin oxide monolayer was highly reactive and reduced by 5.5 × 10−7 Torr H2 at 295 K. However, the ordered monolayer was much less reactive, and nearly inert even in 2.2 Torr H2 at 295 K. Reduction of the tin oxide monolayer occurred only when the sample temperature increased to above 600 K in 5.5 × 10−7 Torr H2 or when the sample temperature was 450 K in 2.2 Torr H2. Disordered and ordered multilayers were found to be much less reactive by comparison to the disordered monolayer film. The reduction activity of these ordered and disordered Sn oxide films varied dramatically (by a factor of 107), demonstrating the structural flexibility of Sn oxides and the key interplay of structure and reactivity.

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Acknowledgments

BEK acknowledges that this material is based upon work supported by the National Science Foundation under Grant No. CBET-1264737. The authors would like to acknowledge H. Bluhm at LBL National Lab for his contribution to the experimental section of this work.

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Author notes

  1. Xiaobo He

    Present address: , 8920 55th Ave. #5G, Elmhurst, NY, 11373, USA

  2. Guangzhi F. Liu

    Present address: , 1860 Furlow Dr, Redlands, CA, 92374, USA

Authors and Affiliations

  1. Department of Chemical and Biological Engineering, Princeton University, Princeton, NJ, 08544, USA

    Laura Y. Kraya, Xiaobo He & Bruce E. Koel

  2. Department of Chemistry, Lehigh University, Bethlehem, PA, 18015-3172, USA

    Guangzhi F. Liu

Authors
  1. Laura Y. Kraya
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  2. Guangzhi F. Liu
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  3. Xiaobo He
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  4. Bruce E. Koel
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Correspondence to Xiaobo He.

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Kraya, L.Y., Liu, G.F., He, X. et al. Structures and Reactivities of Tin Oxide on Pt(111) Studied by Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS). Top Catal 59, 497–505 (2016). https://doi.org/10.1007/s11244-015-0522-6

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  • DOI: https://doi.org/10.1007/s11244-015-0522-6

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