In order to combine a photovoltaic module and an electrolyzer to produce
hydrogen from water, an intermediate DC/DC converter can be used to adapt
output power features of the module to input power features of the
electrolyzer. This can also be done without using electronics, which results
in saving as much as 700 USD/kW, as previous investigation has shown. A more
sophisticated investigation should be carried out with the aim of improving
high system efficiency, resulting in matching the photovoltaic module maximum
power point trajectory (the maximum power point path in the U-I plane as a
result of solar irradiance change) to the operating characteristic of the
electrolyzer. This paper presents an analysis of the influences of
photovoltaic module electric properties, such as series and parallel
resistance and non-ideality factor, on the maximum power point trajectory at
different levels of solar irradiance. The possibility of various inclinations
(right - vertical - left) in relation to an arbitrary chosen operating
characteristic of the electrolyzer is also demonstrated. Simulated results
are obtained by using Matlab/Simulink simulations of the well known one-diode
model. Simulations have been confirmed with experiments on a real
photovoltaic module where solar irradiance, solar cell temperature, electric
current, and voltage in the circuit with variable ohmic resistance have been
measured.
a b s t r a c tIn investigation of different materials for electrodes used in electrolysers for hydrogen production, nickel foam shows wide interests in hydrogen scientific community. This paper brings novel results of performed experiments on pure nickel foam and nickel foam silver coated. The electrochemical behavior of chosen material in high concentrated alkaline media was studied using potentiostatic and potentiodynamic DC and AC electrochemical methods: linear polarization, electrochemical impedance spectroscopy. It was shown that using silver coatings enable higher hydrogen generation. There is defined linear region of the hydrogen production with evidence that an increasing of the electrodes overvoltage decreases the resistance to the charge transfer.
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