Kinetics of hydrogen evolution reaction on iron and its diffusion through membrane from ethylene glycol solutions

Abstract

The article discusses the effect of guanidine concentration on the rate of hydrogen evolution reaction (HER) on iron in ethylene glycol-water (0.1 and 50 wt. % H2O, respectively) solutions of HCl with constant ionic strength. In an ethylene glycol environment, guanidine does not vary the rate of HER and the essence of the delayed stage, but rather increases the hydrogen diffusion rate through steel membrane. In the environment with binary solvent, containing 50 wt. % C2H4(OH)2 and electrolyte of the same composition, the discharge rate of (NH2)2CNH2+ ions determines the first stage of HER, the second stage occurs by the Tafel reaction. An increase in the initial concentration of guanidine stimulates HER and slightly varies the hydrogen diffusion flow into metal.