Place-exchange mechanism of Pt (111) oxidation/reduction as observed by synchrotron X-ray scattering

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Structural changes in the Pt(111) single crystal surface associated with incipient electrochemical oxidation/reduction were studied by {ital in}{ital situ} synchrotron x-ray reflectivity. It was shown that lifting of Pt atoms of the surface layer occurs, substantiating the long-standing hypothesis of a place-exchange mechanism for solution/metal interface oxidation. It was also shown that, for a charge transfer of {approx_lt}1.7 e{sup -}/Pt atom, the initially flat surface structure could be recovered by electrochemical reduction. In constrast, the surface was irreversibly roughened for amounts of charge transfer exceeding {approx}1.7 e{sup -}/Pt, but the roughening involved only the atoms in the top layer of ... continued below

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18 p.

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You, H.; Nagy, Z.; Zurawski, D.J. & Chiarello, R.P. July 1, 1996.

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Description

Structural changes in the Pt(111) single crystal surface associated with incipient electrochemical oxidation/reduction were studied by {ital in}{ital situ} synchrotron x-ray reflectivity. It was shown that lifting of Pt atoms of the surface layer occurs, substantiating the long-standing hypothesis of a place-exchange mechanism for solution/metal interface oxidation. It was also shown that, for a charge transfer of {approx_lt}1.7 e{sup -}/Pt atom, the initially flat surface structure could be recovered by electrochemical reduction. In constrast, the surface was irreversibly roughened for amounts of charge transfer exceeding {approx}1.7 e{sup -}/Pt, but the roughening involved only the atoms in the top layer of the original flat surface. A detailed mechanism is proposed for the place-exchange mechanism and the subsequent roughening of the electrode surface.

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18 p.

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OSTI as DE96014877

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  • 189. meeting of the Electrochemical Society (ECS), Los Angeles, CA (United States), 5-10 May 1996

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  • Other: DE96014877
  • Report No.: ANL/MSD/CP--90769
  • Report No.: CONF-960502--19
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 399995
  • Archival Resource Key: ark:/67531/metadc677331

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  • July 1, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Dec. 14, 2015, 6:28 p.m.

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You, H.; Nagy, Z.; Zurawski, D.J. & Chiarello, R.P. Place-exchange mechanism of Pt (111) oxidation/reduction as observed by synchrotron X-ray scattering, article, July 1, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc677331/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.