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• W1145558375 endingPage "12928" @default.
• W1145558375 startingPage "12918" @default.
• W1145558375 abstract "For many industrial applications, hydrogen must be pressurized before being used or stored. Because compressing liquid water is less energetic than the first levels of gaseous H2 compression, High Temperature Steam Electrolysis (HTSE) performed under pressure might represent an advantageous way for hydrogen production. With the goal of improving the electrolysis efficiency, an experimental and modeling approach has been adopted in order to better understand the basic underlying mechanisms of pressurized electrolysis operation. Experiments were carried on two different single commercial solid oxide cells at 800 °C in the pressure range of 1–10 bar. As a first result, according to the i–V curves, two main pressure effects have been observed. First, as expected, the Open Circuit Voltage is higher under pressure. Then, the limiting current density is increased with increasing the pressure, meaning that the hydrogen production can be improved. The electrochemical model, which has been adjusted on the experimental i–V curves obtained at atmospheric conditions, has been validated for the pressurized operation. Simulations have shown that the improvement of the limiting current is related to the decrease of cathode's concentration overpotential with pressure. Moreover, an optimal pressure can be defined depending on the cell polarization. Higher pressures than the optimal one lead to slightly decrease the hydrogen production rate, mainly due to Open Circuit Voltage increase that cannot be balanced enough by the cathode's concentration overpotential decrease. Finally, this study demonstrates that cell performances under pressure are less sensitive to the variation of cermet-support microstructural properties." @default.
• W1145558375 created "2016-06-24" @default.
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• W1145558375 date "2015-10-01" @default.
• W1145558375 modified "2023-10-16" @default.
• W1145558375 title "Influence of pressure on solid oxide electrolysis cells investigated by experimental and modeling approach" @default.
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• W1145558375 doi "https://doi.org/10.1016/j.ijhydene.2015.07.099" @default.
• W1145558375 hasPublicationYear "2015" @default.
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