In-Situ X-Ray Studies of the Underpotential Deposition of Copper on Platinum (111)
CORNELL UNIV ITHACA NY BAKER LAB
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In-situ x-ray flourescence detected surface EXAFS spectroscopy has been employed to elucidate the in-plane structure of copper underpotentially deposited on a clean and well ordered platinum 111 single crystal electrode. XANES and EXAFS analyses were made as function of applied potential 0.2V, 0.1V, and 0.0V corresponding to coverages of approximately 0.5ML, 0.75ML and 1ML, respectively. The charge derived from electrochemical measurements indicate that at the three potentials studied the electrodeposited copper was not completely discharged. The XANES analysis revealed similarities between the electrodeposited copper and the Cu2O reference lending support to earlier findings of a partially discharged copper ad-layer. EXAFS results suggest two cluster phases at the most positive potential 0.2V studied and an epitaxial arrangement at the most negative potential 0.0V.
- Inorganic Chemistry
- Physical Chemistry
- Atomic and Molecular Physics and Spectroscopy