کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
195139 459807 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of the plastic strain on the hydrogen evolution reaction on polycrystalline nickel electrodes in H2S04
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Influence of the plastic strain on the hydrogen evolution reaction on polycrystalline nickel electrodes in H2S04
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 51, Issue 22, 5 June 2006, Pages 4716–4727
نویسندگان
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