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UHV-EC Characterization of Ultrathin Films Electrodeposited on Well-Defined Noble Metals. I: Pd on Pt(111)

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Abstract

A combination of conventional electrochemistry (cyclic voltammetry and coulometry) and ultrahigh vacuum electron spectroscopies (Auger electron spectroscopy and low-energy electron diffraction) was used to characterize the interfacial chemistry of ultrathin Pd films in the presence of adsorbed and aqueous bromide. Potential-controlled adsorption-desorption cycles of aqueous bromide exerted surface smoothening effects on ultrathin Pd films with defect sites (steps); this procedure, dubbed as electrochemical (EC) annealing, constituted a nonthermal analog to conventional annealing. EC-annealed ultrathin Pd films exhibited long-range surface order and remained free of oxygen adspecies. Pd adatoms occupying step sites were selectively dissolved and/or rearranged to assume equilibrium positions in a well-ordered (1 × 1) film.

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Acknowledgments

The authors would like to thank the Welch Foundation (A-1064) for financial support of this research.

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Authors and Affiliations

  1. Department of Chemistry, University of San Carlos, Cebu City, 6000, Philippines

    Jack H. Baricuatro

  2. Department of Chemistry, Texas A&M University, College Station, TX, 77843, USA

    Mohammad A. Hossain, Yeon-Su Park & Manuel P. Soriaga

Authors
  1. Jack H. Baricuatro
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  2. Mohammad A. Hossain
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  3. Yeon-Su Park
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  4. Manuel P. Soriaga
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Corresponding authors

Correspondence to Jack H. Baricuatro or Manuel P. Soriaga.

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Baricuatro, J.H., Hossain, M.A., Park, YS. et al. UHV-EC Characterization of Ultrathin Films Electrodeposited on Well-Defined Noble Metals. I: Pd on Pt(111). Electrocatal 1, 28–33 (2010). https://doi.org/10.1007/s12678-010-0007-0

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  • DOI: https://doi.org/10.1007/s12678-010-0007-0

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