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Time-Resolved Measurements of Overlayer Ordering in Electrodeposition

Published online by Cambridge University Press:  10 February 2011

A. C. Finnefrock
Affiliation:
Department of Physics, Cornell University, Ithaca, New York 14853
L. J. Bullert
Affiliation:
Department of Chemistry, Cornell University, Ithaca, New York 14853
K. L. Ringland
Affiliation:
Department of Physics, Cornell University, Ithaca, New York 14853
P. D. Tingi
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853
H. D. Abruña
Affiliation:
Department of Chemistry, Cornell University, Ithaca, New York 14853
J. D. Brock
Affiliation:
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853
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Abstract

We report in situ time-resolved surface x-ray scattering measurements of the underpoten-tial deposition of Cu2+ on Pt(111) in the presence of Cl in HClO4 solution. Chronoamperometric (current vs. time) measurements indicate that after a potential step, the electrode-position current decays to 1/e of its initial value in at most 0.12 seconds. In contrast, our simultaneous time-resolved surface x-ray scattering data reveal that the overlayer requires on the order of two seconds to develop long-range periodic order. These results demonstrate that the kinetics of surface ordering can be significantly different from the kinetics of charge-transfer and illustrate the power of time-resolved surface x-ray scattering for in situ studies of electrodeposition.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

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