A SURFACE STUDY OF PT-RU ELECTRODEPOSITS ON GOLD.AUGER AND SEM-EDAX ANALYSIS

B. LÓPEZ DE MISHIMA; G. CASTRO; W. VIELSTICH

Cordoba

Congreso; 43rd Annual Meeting International Society Electrochemistry; 1992

INFICQ-CONICET-UNC

PT-Ru electrodepositswere prepared by electrodeposition at controlled potential from mixed chloroplatinic and and RuCl3 solutions. Ths substrate was gold and the deposits were obtained  at 0.05 V and =.V vs N:H:E:. Different ratio of platinum to ruthenium in the plating  solution was used. The Pt-Ru  electrodeposits are used as elextrocatalyst for the methanol oxidation . The samples were examined using Auger  and SEM-EDAX spectroscopies.To determine the Pt-Ru atomic concentration Pt ( 1965 eV) Ru ( 273 eV) and O ( 505 eV peaks were use. The atomic concentration of O decreases from the surface as the depth increases. Th Ru composition changes as the same way. It is possible the O woul be associated with Ru in ruthenium oxide.