%0 Journal Article
%A Pronkin, S.
%A Hara, M.
%A Wandlowski, Th.
%T Electrocatalytical properties of Au(111-25nm) - Pd quasi-single crystal film electrodes as probed by ATR-SEIRAS
%J Russian journal of electrochemistry
%V 42
%@ 1023-1935
%C Moscow
%I MAIK Nauka/Interperiodica Publ.
%M PreJuSER-53213
%P 1177 - 1192
%D 2006
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000242234800004
%R 10.1134/S1023193506110048
%U https://juser.fz-juelich.de/record/53213