TY - JOUR
T1 - Thickness dependent electrochemical reactivity of epitaxially electrodeposited palladium thin layers on Au(111) and Au(100) surfaces
AU - Naohara, H.
AU - Ye, S.
AU - Uosaki, K.
N1 - Funding Information:
This work was partially supported by a Grant-in-Aid for Scientific Research on Priority Area of ‘Electrochemistry of Ordered Interfaces’ (no. 09237101) from the Ministry of Education, Science, Sports and Culture, Japan. HN acknowledges the Japan Society for the Promotion of Science for their Research Fellowship. SY acknowledges a grant from Iketani Science and Technology Foundation.
PY - 2001/3/16
Y1 - 2001/3/16
N2 - Electrochemical characteristics of ultra thin Pd epitaxial layers deposited electrochemically on Au(111) and Au(100) surfaces were found to be strongly dependent on the surface structure and the thickness of the Pd thin layers. The electrochemical characterizations demonstrate that the Pd/Au(111) and Pd/Au(100) surfaces behave essentially like Pd(111) and Pd(100) surfaces, respectively. Formation and reduction of oxide on the Pd sub-monolayer surfaces took place at more and less positive potentials, respectively, than those on the surfaces of the Pd multilayer. The Pd/Au(100) electrode shows a much higher electrocatalytic activity for the oxidation of formaldehyde than that at the Pd/Au(111) electrode. Furthermore, the highest activity for the electro-oxidation of formaldehyde was observed at the Pd/Au(100) electrode when the thickness of the Pd thin layers was less than a monolayer. This behavior was discussed in terms of the potential- and thickness-dependent oxide formation-reduction on the Pd thin layers.
AB - Electrochemical characteristics of ultra thin Pd epitaxial layers deposited electrochemically on Au(111) and Au(100) surfaces were found to be strongly dependent on the surface structure and the thickness of the Pd thin layers. The electrochemical characterizations demonstrate that the Pd/Au(111) and Pd/Au(100) surfaces behave essentially like Pd(111) and Pd(100) surfaces, respectively. Formation and reduction of oxide on the Pd sub-monolayer surfaces took place at more and less positive potentials, respectively, than those on the surfaces of the Pd multilayer. The Pd/Au(100) electrode shows a much higher electrocatalytic activity for the oxidation of formaldehyde than that at the Pd/Au(111) electrode. Furthermore, the highest activity for the electro-oxidation of formaldehyde was observed at the Pd/Au(100) electrode when the thickness of the Pd thin layers was less than a monolayer. This behavior was discussed in terms of the potential- and thickness-dependent oxide formation-reduction on the Pd thin layers.
KW - Electrochemical reactivity
KW - Palladium epitaxial layers
KW - Palladium thin layers
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U2 - 10.1016/S0022-0728(00)00390-9
DO - 10.1016/S0022-0728(00)00390-9
M3 - Article
AN - SCOPUS:0035277022
VL - 500
SP - 435
EP - 445
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 1572-6657
IS - 1-2
ER -