Journal
ELECTROCHIMICA ACTA
Volume 51, Issue 22, Pages 4716-4727Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2006.01.012
Keywords
polycrystalline nickel; hydrogen evolution reaction; sulphuric acid; dislocations; adsorption
Categories
Ask authors/readers for more resources
The influence of plastic strain on the hydrogen evolution reaction (HER) on polycrystalline nickel, in H2SO4 electrolyte at 293 K, is studied a cathodic potential range. Linear polarisation curves and electrochemical impedance spectra show that the HER is described by a mechanism of Volmer-Heyrovsky, which parameters do not depend on plastic strain. The plastic strain modifies the density and the distribution of dislocations. These evolutions are well understood and lead to changes in the number of hydrogen additional adsorption sites, and then to changes in the current density developed on pre-strained samples. From 0 to 2.4% of plastic strain, the current density increases to reach a maximum value at 2.4%. This current density increase is directly linked to the dislocation density increase. Over 2.4%, the distribution of dislocations is modified and the current density decreases but keeps higher than the current density on an unstrained sample. (c) 2006 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available