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| Home > Publications database > Electrocatalytical properties of Au(111-25nm) - Pd quasi-single crystal film electrodes as probed by ATR-SEIRAS |
| Journal Article | PreJuSER-53213 |
; ;
2006
MAIK Nauka/Interperiodica Publ.
Moscow
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Please use a persistent id in citations: doi:10.1134/S1023193506110048
Abstract: 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.
Keyword(s): J ; SEIRAS (auto) ; quasi-single-crystal Au(111-25 nm) films (auto) ; palladium (auto) ; interfacial water (auto) ; carbon monoxide (auto) ; formic acid (auto) ; adsorption (auto) ; electrooxidation (auto)
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