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Hydrogen evolution reaction on NiCu electrodeposited electrodes in 6.0 M KOH
Author(s) -
Van Vy Uong,
Que Le Xuan
Publication year - 2018
Publication title -
vietnam journal of chemistry
Language(s) - English
Resource type - Journals
eISSN - 2572-8288
pISSN - 0866-7144
DOI - 10.1002/vjch.201800036
Subject(s) - exchange current density , electrode , alloy , current density , cathodic protection , copper , materials science , hydrogen , catalysis , substrate (aquarium) , inorganic chemistry , chemistry , metallurgy , electrochemistry , tafel equation , organic chemistry , physics , oceanography , quantum mechanics , geology
This article presents research of the hydrogen evolution reaction on the NiCu electrodeposited electrodes in 6.0 M KOH solution. Alloy electrodes were deposited on copper substrate in solution containing citrate ions by potentiostatic technique. The influence of the alloying component on the catalytic activity of the electrodes was investigated by cyclicvoltametry (CV) and potentiostatic (PS) techniques. The results show that the hydrogen evolution reaction on the NiCu alloy electrodes in the alkaline solution occurred at voltage of ‐1 V/SCE with very low current density, and significantly increased only when the negative voltage was more negative than ‐1.3 V/SCE. The exchange current density i ex decreased as the copper content in the alloy increased, but the rate decreased unevenly. At ‐1.6 V/SCE, the stabilized cathodic current density on the 58.3 % Cu electrode reached the highest value of about 40 mA/cm 2 , and is 2 to 3 times higher than that of Ni‐plated electrode.