The effect of tap water contaminants on the kinetics of the hydrogen evolution reaction on
a nickel electrode in 1 mol dm3 KOH was investigated by galvanostatic polarization and
electrochemical impedance spectroscopy techniques. It was found that the tap water
contaminants lead to an increase in the overpotential of the hydrogen evolution reaction,
especially at low temperatures. The combination of electrochemical techniques, as well as
physicochemicals such as SEM and EDAX ones, confirmed that the contaminants are
specifically adsorbed and blocked the available electrode surface for the reaction. It was
concluded that they do not participate in an electrochemical reaction in the potential
region where HER occurs. Besides the short term negative impact on the rate of hydrogen
evolution, a 55 h test revealed that the overpotential shows a steady increase over time in
presence of tap water contaminants, while in absence of these contaminants the overpotential
is constant.
PETROV Yanko;
SCHOSGER Jean-Pierre;
STOYNOV Zdravko;
DE BRUIJN Frank;
2011-09-28
PERGAMON-ELSEVIER SCIENCE LTD
JRC52576
0360-3199,
http://www.sciencedirect.com/science/article/pii/S0360319911017095,
https://publications.jrc.ec.europa.eu/repository/handle/JRC52576,
10.1016/j.ijhydene.2011.07.049,
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