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Theoretical study on pressurized operation of solid oxide electrolysis cells

descriptionPublicationkeyboard_double_arrow_right Article , Journal , Conference object , Other literature type 01 Aug 2014 Germany Publisher:Elsevier BVJournal:International Journal of Hydrogen Energy, volume 39, pages 12,434-12,439 (issn: 0360-3199,

Authors: Moritz Henke; Caroline Willich; Josef Kallo; K. Andreas Friedrich; K. Andreas Friedrich;

doi: 10.1016/j.ijhydene.2014.05.185

Theoretical study on pressurized operation of solid oxide electrolysis cells

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Abstract

Abstract In this paper the influence of pressure on the performance of solid oxide electrolysis cells is theoretically analyzed in a pressure range between 0.05 and 2 MPa. A previously validated electrochemical model of a solid oxide fuel cell stack is used to predict electrolysis behavior. The effect of pressure on thermodynamics, kinetics and gas diffusion is discussed. It is shown that thermodynamics are negatively influenced by an increase in pressure whereas kinetics and gas transport are improved. Overall pressure effects are therefore only small. At low current density the electrolysis cell shows better performance at low pressure whereas performance improves with pressure at high current densities.

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Germany

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Keywords

Solid oxide electrolysis cell Pressure Power density Efficiency SOEC Pressurized SOEC, PSOEC

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