Kinetics and Nature of the Slow Stage
of Cathodic Hydrogen Evolution on Iron in Aqueous
and WaterEthylene-Glycol Solutions of HCl in the Presence
of o-Fluorophenylbiguanidine

V. I. Vigdorovich^a,z, L. E. Tsygankova^b, D. V. Balybin^b, V. I. Kichigin^c, and D. V. Kryl’skii^d

^aTambov State Technical University, Tambov, Russia

^bTambov State University, Tambov, Russia

^cPerm State University, Perm, Russia

^dInstitute of Applied Acoustics, Dubna, Russia

Received June 25, 2012

Abstract—The influence of the concentration of o-fluorophenylbiguanidine (FF) (0.5–40 mM) on the kinetics
of hydrogen evolution on iron in aqueous and ethylene glycol (10 wt % H₂O) solutions with an electrolyte x M
HCl + (1 – x) M LiCl was studied. In aqueous media, the introduction of increasing concentrations of FF led to
a transition from one slow stage to other stages in a series: slow discharge slow recombination slow lateral
diffusion slow discharge. In ethylene glycol media, the series is formally the same, but there is no initial slow
discharge and hydrogen evolution (HER) in supporting solutions is limited by chemical recombination, which
shifts to slow lateral diffusion already in the presence of 0.1 mM FF. In aqueous solutions, this change in the
nature of the rate-limiting stage requires a 50-fold increase in the FF concentration. Finally, at a certain FF con-
centration, HER occurs under the conditions of slow discharge.

Keywords: hydrogen evolution, acid media, ethylene glycol, slow stage, discharge, recombination, surface dif-
fusion, ortho-fluorophenylbiguanidine

DOI: 10.1134/S1023193513110116

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