INVESTIGADORES
VAZQUEZ marcela Vivian
artículos
Título:
Surface redox catalysis and reduction kinetics of hydrogen peroxide on coppernickel alloys
Autor/es:
SILVIA CERE; MARCELA VAZQUEZ; SUSANA R. DE SANCHEZ; DAVID J. SCHIFFRIN
Revista:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Editorial:
ELSEVIER
Referencias:
Año: 1999 vol. 470 p. 31 - 38
ISSN:
0022-0728
Resumen:
The electrochemical reduction of hydrogen peroxide on the copper-nickel alloys Cu90Ni10 and Cu70Ni30 in 0.1 M borax hasbeen investigated. The results have been analysed on the basis of a chemicalelectrochemical mechanism involving a surfaceCu(I):Cu(II) redox couple. The electrochemical step corresponds to the reduction of Cu(II) followed by the chemical reaction ofCu(I) with hydrogen peroxide. The rate of hydrogen peroxide reduction is strongly dependent on the rate constant of the chemicalstep. The potential dependence of the surface coverage by Cu(I) species accounts for the large values of the Tafel slopes. Thecatalytic effect of Cu(I) is similar to that of AuOH noted previously for the reduction of H2O2 on gold. Ellipsometricmeasurements also indicate the presence of an oxide:hydroxide layer at the interface at potentials very negative with respect tobulk Cu2O reduction. © 1999 Elsevier Science S.A. All rights reserved
