Hydrogen diffusion effects on the kinetics of the hydrogen electrode reaction. Part II. Evaluation of kinetics parameters

QUAINO, PAOLA MÓNICA; GENNERO DE CHIALVO, MARÍA ROSA; CHIALVO, ABEL CÉSAR

PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Royal Society of Chemistry

Lugar: Londres; Año: 2004 vol. 6 p. 4450 - 4455

1463-9076

The present work proposes a methodology for the evaluation of the kinetic parameters of the hydrogen electrode reaction for the Tafel-Heyrovsky-Volmer mechanism from experimental results corresponding to the study of the hydrogen oxidation on a rotating disc electrode. It is based on the correlation of the experimental dependence j(h, w) with a theoretical expression together with some constraints that involve the use of the equilibrium polarisation resistance, which reduces the number of adjustable parameters. This methodology was applied to the hydrogen oxidation reaction on a platinum electrode, which was studied in the range 900 £ w / rpm £ 8100 and -0.05 £ h / V £ 0.40 in 0.5 M H2SO4. The results obtained have been discussed on the light of the theoretical treatment described in the part I of this work.