This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1134/S1023193506110048 in citations.
Electrocatalytical properties of Au(111-25nm) - Pd quasi-single crystal film electrodes as probed by ATR-SEIRAS
Electrocatalytical properties of Au(111-25nm) - Pd quasi-single crystal film electrodes as probed by ATR-SEIRAS
Electrochemical and electrocatalytic properties of thin films Au(111-25 nm), which are quasi-single-crystal electrodes 25 nm thick made of gold with the (I 11) preferential orientation, and same electrodes modified with a monolayer (ML) of palladium are studied in 0.1 M solutions of HClO4 and H2SO4...
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Personal Name(s): | Pronkin, S. |
---|---|
Hara, M. / Wandlowski, Th. | |
Contributing Institute: |
Institut für Grenzflächen und Vakuumtechnologien; ISG-3 Center of Nanoelectronic Systems for Information Technology; CNI |
Published in: | Russian journal of electrochemistry, 42 (2006) S. 1177 - 1192 |
Imprint: |
Moscow
MAIK Nauka/Interperiodica Publ.
2006
|
Physical Description: |
1177 - 1192 |
DOI: |
10.1134/S1023193506110048 |
Document Type: |
Journal Article |
Research Program: |
Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Russian Journal of Electrochemistry
42 |
Subject (ZB): | |
Publikationsportal JuSER |
Electrochemical and electrocatalytic properties of thin films Au(111-25 nm), which are quasi-single-crystal electrodes 25 nm thick made of gold with the (I 11) preferential orientation, and same electrodes modified with a monolayer (ML) of palladium are studied in 0.1 M solutions of HClO4 and H2SO4 employing voltammetric techniques and surface enhanced infrared reflection absorption spectroscopy (ATR-SEIRAS). Spectroscopic experiments demonstrate strong adsorption of electrolyte species (H2O, OHads, anions) on the Pd surface. The weak and reversible adsorption of CO on Au(111-25 nm) does not change the interfacial-water structure. Adsorption of CO on the Pd-modified film results in an irreversibly adsorbed CO adlayer stabilized by co-adsorbed isolated water species. Various electrooxidation mechanisms are discussed. Electrochemical and spectroscopic investigations on the adsorption and electrooxidation of HCOOH on bare and I ML Pd-Au(111-25 nm) electrodes reveal that electrooxidation proceeds in both cases via a direct or dehydrogenation pathway. This mechanism involves the formation of formate as intermediate, which is detected by in situ ATR-SEIRAS. The reactivity on Pd-modified surfaces is higher than on bare gold. The specifically adsorbed anions (sulfate/bisulfate) and the oxide formation on the substrate surface lower the reactivity for CO and HCOOH on both surfaces. |