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Pressurized operation of a 10 layer solid oxide electrolysis stack

Riedel, Marc and Nitsche, Robert and Henke, Moritz and Heddrich, Marc P. and Friedrich, K. Andreas (2016) Pressurized operation of a 10 layer solid oxide electrolysis stack. 12th European Fuel Cell Forum, 5.-8. Jul. 2016, Luzern, Schweiz.

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Abstract

Solar and wind energy are becoming the fundament of the power supply system. However, the increasingly significant amount of renewable electrical power associated with natural intermittency due to varying weather conditions requires flexible storage options. One promising path is the solid oxide electrolysis cells (SOECs) technology which can provide hydrogen or derived hydrocarbons as fuel in transport, as chemical in industry or for repowering or heating. SOECs offer a great potential for a highly efficient energy conversion due to their high operating temperature that may lead to reduced electrochemical losses. Previous studies have shown that the efficiency of solid oxide fuel cells (SOFCs) can be significantly improved by operating at elevated pressure. Similar effects on the electrochemistry can also influence the cell when operated in electrolysis mode and may also cause improved performance. Another reason for pressurization is the use of pressurized hydrogen in downstream processes like storage or especially in the case of co-electrolysis methanation or Fischer-Tropsch synthesis. Experimental results of water electrolysis in a pressurized SOEC stack are presented. The stack consists of ten electrolyte supported cells. The pressure ranges from 1 to 8 bar. Reactant gas composition (xH2O=0.80…0.98), steam utilization (0.60…0.85) and temperature (750…850 °C) are the experimental parameters that are varied. Pressure influence on open circuit voltage (OCV) and power density is examined. Furthermore current voltage characteristics and impedance spectroscopy are performed to investigate the influence of pressure on the stack performance.

Item URL in elib:https://elib.dlr.de/105558/
Document Type:Conference or Workshop Item (Poster)
Title:Pressurized operation of a 10 layer solid oxide electrolysis stack
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Riedel, MarcMarc.Riedel (at) dlr.deUNSPECIFIED
Nitsche, RobertUNSPECIFIEDUNSPECIFIED
Henke, Moritzmoritz.henke (at) dlr.deUNSPECIFIED
Heddrich, Marc P.marc.heddrich (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:July 2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:SOEC, pressurized SOEC, electrolysis
Event Title:12th European Fuel Cell Forum
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:5.-8. Jul. 2016
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Electrolysis) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Riedel, Marc
Deposited On:11 Aug 2016 10:42
Last Modified:11 Aug 2016 10:42

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