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Experimental Analysis of the Co-Electrolysis Operation under Pressurized Conditions with a 10 Layer SOC Stack

Riedel, Marc und Heddrich, Marc P. und Friedrich, Kaspar Andreas (2020) Experimental Analysis of the Co-Electrolysis Operation under Pressurized Conditions with a 10 Layer SOC Stack. Journal of The Electrochemical Society. Electrochemical Society, Inc.. doi: 10.1149/1945-7111/ab6820. ISSN 0013-4651.

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Offizielle URL: https://iopscience.iop.org/article/10.1149/1945-7111/ab6820

Kurzfassung

This study examines the performance of a solid oxide cell (SOC) stack during co-electrolysis of CO2 and H2O at elevated pressures up to 8 bar. Steady-state and dynamically recorded U(i)-curves were performed in order to evaluate the performance over a wide temperature range and to quantify the area specific resistance (ASR) at different pressure levels. Furthermore, the outlet gas composition at various current densities was analyzed and compared with the thermodynamic equilibrium. The open circuit voltage (OCV) was found to increase with higher pressure due to well known thermodynamic relations. An increase of the limiting current density at elevated pressure was not observed for the investigated stack with electrolyte supported cells. The ASR of the stack was found to decrease slightly with higher pressure. It revealed an increase of the cell resistance with lower H/C ratios in the feed at lower temperatures, whereas the performance of the co-electrolysis was very similar to steam electrolysis for temperatures above 820 °C. Within an impedance study for steam, co- and CO2 electrolysis operation it was shown that pure CO2 electrolysis exhibits a higher pressure sensitivity compared to pure steam or co-electrolysis due to significantly increased activation and diffusion resistances.

elib-URL des Eintrags:https://elib.dlr.de/136940/
Dokumentart:Zeitschriftenbeitrag
Titel:Experimental Analysis of the Co-Electrolysis Operation under Pressurized Conditions with a 10 Layer SOC Stack
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Riedel, MarcMarc.Riedel (at) dlr.dehttps://orcid.org/0000-0001-8823-6760NICHT SPEZIFIZIERT
Heddrich, Marc P.Marc.Heddrich (at) dlr.dehttps://orcid.org/0000-0002-7037-0870NICHT SPEZIFIZIERT
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:17 Januar 2020
Erschienen in:Journal of The Electrochemical Society
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1149/1945-7111/ab6820
Verlag:Electrochemical Society, Inc.
ISSN:0013-4651
Status:veröffentlicht
Stichwörter:pressurized electrolysis, SOEC, co-electrolysis, pressure
HGF - Forschungsbereich:Energie
HGF - Programm:Speicher und vernetzte Infrastrukturen
HGF - Programmthema:Elektrolyse und Wasserstoff
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E SP - Energiespeicher
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (Elektrolyse) (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Riedel, Marc
Hinterlegt am:04 Dez 2020 14:29
Letzte Änderung:24 Okt 2023 14:17

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