INVESTIGADORES
FERNANDEZ Jose Luis
artículos
Título:
Hydrogen oxidation reaction on microelectrodes: analysis of the contribution of the kinetic routes
Autor/es:
P.M. QUAINO; J.L. FERNÁNDEZ; M.R. GENNERO DE CHIALVO; A.C. CHIALVO
Revista:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2006 vol. 252 p. 156 - 162
ISSN:
1381-1169
Resumen:
Recent experimental studies of the hydrogen oxidation reaction (hor) on platinum microelectrodes have shown the existence of a shoulder in the steady state polarization curves. An explanation for this behavior is presented on the basis of a rigorous kinetic treatment involving the TafelHeyrovskyVolmer (THV) mechanism. It has been found that such behavior is due to the significant variation of the reaction rates of the TafelVolmer (TV) and HeyrovskyVolmer (HV) routes with overpotential (ç). At low ç values, the TV route dominates the kinetics of the hor, reaching values close to the maximum rate corresponding to this route. At higher ç values, the contribution of the HV route increases while that of the TV route diminishes. On this basis, the experimental results were accurately correlated and the corresponding elementary kinetic parameters were evaluated. The contribution of the different types of microelectrodes to the improvement of the determination of the kinetic parameters for the hor is also discussed.