Study of the Hydrogen Electrode Reaction on Ruthenium Electrodes: Evaluation of the Polarization Resistance as a Function of the Proton Activity

M.S. RAU; P.M. QUAINO; M.R. GENNERO DE CHIALVO; A.C. CHIALVO

Sevilla

Congreso; The 59th Annual Meeting of the International Society of Electrochemistry (ISE); 2008

International Society of Electrochemistry (ISE)

The kinetic parameters of the hydrogen electrode reaction (HER) can be evaluated through the dependence of the equilibrium polarization resistence (Rp) with the proton activity (aH+) and/or the hydrogen partial pressure (PH2) under well-defined hydrodynamic conditions [1]. In this context, 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 evaluation of the current density dependences jexp(aH +) around the equilibrium potential on a rotating disc ruthenium electrode. The experimental determinations were carried out in the overpotential range (-0.010 < eta/ V