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- W2077656332 abstract "The structure of Bi adlayers on the Au(111) electrode surface during the course of O2 reduction has been investigated by in situ surface X-ray scattering. Under oxygen reduction conditions, both the low-coverage (2 × 2)-Bi and the close-packed (p × √3)-2Bi adlayer structures are stable. We developed an electrochemical drop cell that provides a more uniform potential distribution during high current conditions compared with commonly used thin-layer cells. Our results clearly indicate distinctly different catalytic properties for the two ordered bismuth adlayer phases. In the potential region corresponding to the (2 × 2)-Bi phase, O2 reduction is promoted to a four-electron reaction, albeit with relatively slow kinetics. The close-packed (p × √3)-2Bi phase, formed at more negative potentials, appears to have a limited number of sites available for four-electron reduction, but the reaction kinetics on this adlayer is enhanced by an increased overpotential." @default.
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- W2077656332 date "2002-03-21" @default.
- W2077656332 modified "2023-10-16" @default.
- W2077656332 title "Structure of Active Adlayers on Bimetallic Surfaces: Oxygen Reduction on Au(111) with Bi Adlayers" @default.
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- W2077656332 doi "https://doi.org/10.1021/jp012960t" @default.
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