Electrochemical Characterization and Performance Assessment of SOC Stacks in Electrolysis Mode

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

Abstract

High temperature electrolysis (HTE) of steam, CO2, and steam and CO2 for highly efficient generation of hydrogen, carbon monoxide as well as syngas was investigated for four solid oxide cell stacks, all supplied by different stack manufacturers. The SOCs employed within the stacks were planar, and electrolyte or electrode supported with an industrial size between 80 and 128 cm². A comprehensive electrochemical characterization of both stacks and individual cells within the stacks was conducted by means of electrochemical impedance spectroscopy and polarization curve measurement. Detailed performance analyses showed the highest efficiency when operating the stack under H2O electrolysis, followed by co-electrolysis and eventually CO2 electrolysis. Subsequently, the stacks were operated under reversible systemrelevant steady-state conditions, thus varying the working temperatures, the current density and the gas inlet flow. For that purpose both the conversion rate and fuel utilization were set to be between 70% and 80%. All stacks were operated for long-term periods of >1,000 h, during which degradation monitoring was applied. The results obtained within the present study allow a better understanding of the electrochemical processes that occur during reversible operation and especially HTE, and provide a guideline for optimized operation of a fully autonomous rSOC system.
Originalspracheenglisch
Seiten (von - bis)2589-2600
Seitenumfang12
FachzeitschriftECS Transactions
Jahrgang91
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - Jul 2019
Veranstaltung16th International Symposium on Solid Oxide Fuel Cells (SOFC-XVI)
- Kyoto, Japan
Dauer: 8 Sep 201913 Sep 2019

Fingerprint

Electrolysis
Steam
Inlet flow
Electrochemical impedance spectroscopy
Carbon monoxide
Temperature
Current density
Electrolytes
Polarization
Degradation
Hydrogen
Electrodes
Oxides
Monitoring
Gases

Dies zitieren

Electrochemical Characterization and Performance Assessment of SOC Stacks in Electrolysis Mode. / Preininger, Michael; Stöckl, Bernhard; Subotić, Vanja; Schauperl, Richard; Hochenauer, Christoph.

in: ECS Transactions, Jahrgang 91, Nr. 1, 07.2019, S. 2589-2600.

Publikation: Beitrag in einer Fachzeitschrift!!Conference articleForschungBegutachtung

@article{e82a5d45f340472687b0f6f57c1ef570,
title = "Electrochemical Characterization and Performance Assessment of SOC Stacks in Electrolysis Mode",
abstract = "High temperature electrolysis (HTE) of steam, CO2, and steam and CO2 for highly efficient generation of hydrogen, carbon monoxide as well as syngas was investigated for four solid oxide cell stacks, all supplied by different stack manufacturers. The SOCs employed within the stacks were planar, and electrolyte or electrode supported with an industrial size between 80 and 128 cm². A comprehensive electrochemical characterization of both stacks and individual cells within the stacks was conducted by means of electrochemical impedance spectroscopy and polarization curve measurement. Detailed performance analyses showed the highest efficiency when operating the stack under H2O electrolysis, followed by co-electrolysis and eventually CO2 electrolysis. Subsequently, the stacks were operated under reversible systemrelevant steady-state conditions, thus varying the working temperatures, the current density and the gas inlet flow. For that purpose both the conversion rate and fuel utilization were set to be between 70{\%} and 80{\%}. All stacks were operated for long-term periods of >1,000 h, during which degradation monitoring was applied. The results obtained within the present study allow a better understanding of the electrochemical processes that occur during reversible operation and especially HTE, and provide a guideline for optimized operation of a fully autonomous rSOC system.",
author = "Michael Preininger and Bernhard St{\"o}ckl and Vanja Subotić and Richard Schauperl and Christoph Hochenauer",
year = "2019",
month = "7",
doi = "10.1149/09101.2589ecst",
language = "English",
volume = "91",
pages = "2589--2600",
journal = "ECS Transactions",
issn = "1938-5862",
publisher = "Electrochemical Society, Inc.",
number = "1",

}

TY - JOUR

T1 - Electrochemical Characterization and Performance Assessment of SOC Stacks in Electrolysis Mode

AU - Preininger, Michael

AU - Stöckl, Bernhard

AU - Subotić, Vanja

AU - Schauperl, Richard

AU - Hochenauer, Christoph

PY - 2019/7

Y1 - 2019/7

N2 - High temperature electrolysis (HTE) of steam, CO2, and steam and CO2 for highly efficient generation of hydrogen, carbon monoxide as well as syngas was investigated for four solid oxide cell stacks, all supplied by different stack manufacturers. The SOCs employed within the stacks were planar, and electrolyte or electrode supported with an industrial size between 80 and 128 cm². A comprehensive electrochemical characterization of both stacks and individual cells within the stacks was conducted by means of electrochemical impedance spectroscopy and polarization curve measurement. Detailed performance analyses showed the highest efficiency when operating the stack under H2O electrolysis, followed by co-electrolysis and eventually CO2 electrolysis. Subsequently, the stacks were operated under reversible systemrelevant steady-state conditions, thus varying the working temperatures, the current density and the gas inlet flow. For that purpose both the conversion rate and fuel utilization were set to be between 70% and 80%. All stacks were operated for long-term periods of >1,000 h, during which degradation monitoring was applied. The results obtained within the present study allow a better understanding of the electrochemical processes that occur during reversible operation and especially HTE, and provide a guideline for optimized operation of a fully autonomous rSOC system.

AB - High temperature electrolysis (HTE) of steam, CO2, and steam and CO2 for highly efficient generation of hydrogen, carbon monoxide as well as syngas was investigated for four solid oxide cell stacks, all supplied by different stack manufacturers. The SOCs employed within the stacks were planar, and electrolyte or electrode supported with an industrial size between 80 and 128 cm². A comprehensive electrochemical characterization of both stacks and individual cells within the stacks was conducted by means of electrochemical impedance spectroscopy and polarization curve measurement. Detailed performance analyses showed the highest efficiency when operating the stack under H2O electrolysis, followed by co-electrolysis and eventually CO2 electrolysis. Subsequently, the stacks were operated under reversible systemrelevant steady-state conditions, thus varying the working temperatures, the current density and the gas inlet flow. For that purpose both the conversion rate and fuel utilization were set to be between 70% and 80%. All stacks were operated for long-term periods of >1,000 h, during which degradation monitoring was applied. The results obtained within the present study allow a better understanding of the electrochemical processes that occur during reversible operation and especially HTE, and provide a guideline for optimized operation of a fully autonomous rSOC system.

U2 - 10.1149/09101.2589ecst

DO - 10.1149/09101.2589ecst

M3 - Conference article

VL - 91

SP - 2589

EP - 2600

JO - ECS Transactions

JF - ECS Transactions

SN - 1938-5862

IS - 1

ER -