title: Catalytic effects of ruthenium and osmium spontaneous deposition on platinum surfaces toward methanol oxidation.
abstract: 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.
authors.affiliation: Laboratório de Fisicoquímica Teórica e Aplicada, LAFTA, Instituto de Ciências Exatas e Tecnología, Universidade Paulista, Dr. Bacelar 1212, CEP 04026 002 São Paulo, Brazil.
authors.forename: S H
authors.initials: SH
authors.lastname: Bonilla
authors.forename: C F
authors.initials: CF
authors.lastname: Zinola
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez
authors.forename: V
authors.initials: V
authors.lastname: Díaz
authors.forename: M
authors.initials: M
authors.lastname: Ohanian
authors.forename: S
authors.initials: S
authors.lastname: Martínez
authors.forename: B F
authors.initials: BF
authors.lastname: Giannetti
mesh_terms: 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
chemical_list: D013464:Sulfuric Acids; D009992:Osmium; D010984:Platinum; D012428:Ruthenium; C033158:sulfuric acid; D000432:Methanol