Catalytic effects of ruthenium and osmium spontaneous deposition on platinum surfaces toward methanol oxidation.
The influence of ruthenium and osmium spontaneous deposition on polycrystalline platinum in sulfuric acid was studied by conventional electrochemical techniques. The inhibition of the hydrogen adatom voltammetric profile by the foreign adatoms was used to calculate the degree of surface coverage of ruthenium, osmium, and a mixture of both metal ions from solutions of different composition. Methanol adsorption and oxidation were compared on bare platinum, platinum/ruthenium, platinum/osmium, and ternary compounds, considering the efficiency of methanol oxidation per hydrogen adatom displaced by the foreign metal on platinum.
Bonilla
S H
SH
Laboratório de Fisicoquímica Teórica e Aplicada, LAFTA, Instituto de Ciências Exatas e Tecnología, Universidade Paulista, Dr. Bacelar 1212, CEP 04026 002 São Paulo, Brazil.
Zinola
C F
CF
Rodríguez
J
J
Díaz
V
V
Ohanian
M
M
Martínez
S
S
Giannetti
B F
BF
D000327:Adsorption; D002384:Catalysis; D003460:Crystallization; D004563:Electrochemistry; D000432:Methanol / Q000737:chemistry*; D009992:Osmium / Q000737:chemistry*; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry; D013499:Surface Properties
D013464:Sulfuric Acids; D009992:Osmium; D010984:Platinum; D012428:Ruthenium; C033158:sulfuric acid; D000432:Methanol