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The connection between hydrogen diffusion through a steel membrane and mechanism of the hydrogen evolution reaction
Author(s) -
Tsygankova L. E.,
Vigdorovich V. I.,
Vigdorovich M. V.
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1846
Subject(s) - tafel equation , hydrogen , chemistry , diffusion , ethylene glycol , transition metal , carbon fibers , kinetics , metal , reaction rate , reaction mechanism , inorganic chemistry , thermodynamics , catalysis , materials science , organic chemistry , composite material , electrochemistry , physics , electrode , quantum mechanics , composite number
The kinetics of the hydrogen evolution reaction (HER) on Armco iron and carbon steel have been studied in the C 2 H 4 (OH) 2 H 2 OHCl system. The addition of 5–10% water or 1–10 m M Na 2 HAsO 4 to the ethylene glycol solutions of HCl causes a transition from the Volmer rate determining step (rds) to the Tafel rds in the HER mechanism. According to experimental data, the rate of hydrogen diffusion through the carbon steel membrane does not depend on the rds nature of the HER. Theoretical analysis of the peculiarities of the Tafel rds has been carried out in which a recombination step was represented as a set of successive reactions. An expression has been obtained which determines the balance of surface processes and the hydrogen permeation into the bulk of the metal. It has been confirmed experimentally. Copyright © 2004 John Wiley & Sons, Ltd.