Electrosorption of carbon Dioxide on Rh Binary Alloys with Pt and Pd

Siwek, H.; Łukaszewski, M.; Czerwiński, A.

Artykuł - szczegóły

Tytuł artykułu

Electrosorption of carbon Dioxide on Rh Binary Alloys with Pt and Pd

Autorzy

Siwek H. , Łukaszewski M. , Czerwiński A.

Identyfikatory

Warianty tytułu

Języki publikacji

Abstrakty

Pt-Rh and Pd-Rh alloys were prepared by electrochemical codeposition. Surface compositions of the alloys were determined from the potential of surface oxides reduction peak. Carbon dioxide was electrosorbed at constant potential in the range where underpotentially deposited hydrogen exists on the electrode surface. The presence of adsorbed CO2 causes remarkable diminution of hydrogen adsorption signals on the voltammograms recorded after CO2 adsorption for both Pt-Rh and Pd-Rh alloys. In the case of hydrogen-absorbing Pd-Rh electrodes adsorbed CO2 does not influence significantly hydrogen insertion into the alloy bulk. Oxidative removal of CO2 adsorbed on Pt-Rh and Pd-Rh results in a characteristic voltammetric peak, whose potential and shape depend on alloy surface composition. Eps (electron per site) values calculated for the oxidation of CO2 adsorbed at a fixed potential (0.015 V) and alloy surface composition, being higher for alloys containing more Rh, with a maximum for pure Rh. It suggests that the structure and composition of CO2 adsorption product vary with electrode surface properties and experimental conditions.

Słowa kluczowe

binary noble metal alloys carbon dioxide electrosorption cyclic voltametry

Wydawca

Polskie Towarzystwo Chemiczne

Czasopismo

Polish Journal of Chemistry

Rocznik

2004

Tom

Vol. 78 / nr 9

Strony

1121--1133

Opis fizyczny

Bibliogr. 65 poz., rys.

Twórcy

autor

Siwek H.

Warsaw University, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland
Industrial Chemistry Research Institute, Rydygiera 8, 01-793 Warsaw, Poland

autor

Łukaszewski M.

Warsaw University, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland

autor

Czerwiński A.

Warsaw University, Department of Chemistry, Pasteura 1, 02-093 Warsaw, Poland
Industrial Chemistry Research Institute, Rydygiera 8, 01-793 Warsaw, Poland

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Bibliografia

Identyfikator YADDA

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