Abstract
Influence of nature and concentration (1-10 mM) of surface-active substances (SAS) phenylbiguanidine and m-nitrophenylbiguanidine on hydrogen evolution reaction (HER) kinetics on iron has been studied in acidic chloride solutions with constant ionic strength equal to 1. The rate-determining stage of HER changes dependending on SAS nature and concentration according to the consequence: discharge → chemical recombination → surface diffusion → discharge. With some SAS concentrations, two consecutive stages proceed at commensurable rates. The possibility of discharge or chemical recombination stage proceeding on ad-atoms or adsorbate molecules forming the first monolayer is considered.
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