Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A state-of-the-art ten-layer solid oxide stack was electrochemically characterized and system-oriented experimentally investigated in reversible operation. The stack in question consists of 5YbSZ electrolyte supported planar cells promising high performance. The stack is integrated into a stackbox and is considered to be operated in an autonomous system, thus system-relevant operating conditions in terms of reversibility, inlet mixtures and temperatures were applied. A high fuel utilization, respectively reactant conversion of 80% in either mode was deployed in steady state experiments in a transient operation regime. Polarization curves were dynamically recorded and electrochemical impedance spectroscopy was performed to evaluate the performance of the stack in reversible operation feeding hydrogen and/or carbonaceous gases. Recorded temperature profiles obtained by means of thermocouples placed directly on the air electrodes showed distinct characteristics with a maximum deviation of 24.8K in the exothermic and 14.9K in the endothermic operating mode. The stack showed a small dependency on the applied operating temperatures of 780, 800, and 820 °C. A maximum current density of −0.7Acm-2 was applicable under H2O electrolysis. A comparable performance was observed for co-electrolysis corroborated by current density independent syngas ratios of 9.0 and 4.0 when feeding H2/H2O/CO2-compositions of 20/70/10 and 20/60/20, respectively. Particular attention must be paid to thermal integration in the context of the implementation as a stand-alone system. The resulting operating maps related to maximum current densities, gas production and temperatures can be considered and used for simulation and design of the envisaged stand-alone system including the auxiliary power requirements.
Original languageEnglish
Article number113695
Number of pages15
JournalApplied Energy
Volume254
DOIs
Publication statusPublished - 2 Aug 2019

Fingerprint

oxide
Oxides
Current density
Electrolysis
density current
electrokinesis
Temperature
Thermocouples
Electrochemical impedance spectroscopy
Gases
temperature
gas production
temperature profile
electrolyte
Electrolytes
Polarization
electrode
polarization
Hydrogen
Electrodes

Keywords

  • Reversible Solid Oxide Cell
  • Characterization
  • Electrolyte supported cell
  • 10 layer stack
  • EIS
  • Steady state operation
  • Transient operation

Cite this

@article{fc03f0cc396f4c0a8831208ac3d3b272,
title = "Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application",
abstract = "A state-of-the-art ten-layer solid oxide stack was electrochemically characterized and system-oriented experimentally investigated in reversible operation. The stack in question consists of 5YbSZ electrolyte supported planar cells promising high performance. The stack is integrated into a stackbox and is considered to be operated in an autonomous system, thus system-relevant operating conditions in terms of reversibility, inlet mixtures and temperatures were applied. A high fuel utilization, respectively reactant conversion of 80{\%} in either mode was deployed in steady state experiments in a transient operation regime. Polarization curves were dynamically recorded and electrochemical impedance spectroscopy was performed to evaluate the performance of the stack in reversible operation feeding hydrogen and/or carbonaceous gases. Recorded temperature profiles obtained by means of thermocouples placed directly on the air electrodes showed distinct characteristics with a maximum deviation of 24.8K in the exothermic and 14.9K in the endothermic operating mode. The stack showed a small dependency on the applied operating temperatures of 780, 800, and 820 °C. A maximum current density of −0.7Acm-2 was applicable under H2O electrolysis. A comparable performance was observed for co-electrolysis corroborated by current density independent syngas ratios of 9.0 and 4.0 when feeding H2/H2O/CO2-compositions of 20/70/10 and 20/60/20, respectively. Particular attention must be paid to thermal integration in the context of the implementation as a stand-alone system. The resulting operating maps related to maximum current densities, gas production and temperatures can be considered and used for simulation and design of the envisaged stand-alone system including the auxiliary power requirements.",
keywords = "Reversible Solid Oxide Cell, Characterization, Electrolyte supported cell, 10 layer stack, EIS, Steady state operation, Transient operation",
author = "Michael Preininger and Bernhard St{\"o}ckl and Vanja Subotić and Frank Mittmann and Christoph Hochenauer",
year = "2019",
month = "8",
day = "2",
doi = "10.1016/j.apenergy.2019.113695",
language = "English",
volume = "254",
journal = "Applied Energy",
issn = "0306-2619",
publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Performance of a ten-layer reversible Solid Oxide Cell stack (rSOC) under transient operation for autonomous application

AU - Preininger, Michael

AU - Stöckl, Bernhard

AU - Subotić, Vanja

AU - Mittmann, Frank

AU - Hochenauer, Christoph

PY - 2019/8/2

Y1 - 2019/8/2

N2 - A state-of-the-art ten-layer solid oxide stack was electrochemically characterized and system-oriented experimentally investigated in reversible operation. The stack in question consists of 5YbSZ electrolyte supported planar cells promising high performance. The stack is integrated into a stackbox and is considered to be operated in an autonomous system, thus system-relevant operating conditions in terms of reversibility, inlet mixtures and temperatures were applied. A high fuel utilization, respectively reactant conversion of 80% in either mode was deployed in steady state experiments in a transient operation regime. Polarization curves were dynamically recorded and electrochemical impedance spectroscopy was performed to evaluate the performance of the stack in reversible operation feeding hydrogen and/or carbonaceous gases. Recorded temperature profiles obtained by means of thermocouples placed directly on the air electrodes showed distinct characteristics with a maximum deviation of 24.8K in the exothermic and 14.9K in the endothermic operating mode. The stack showed a small dependency on the applied operating temperatures of 780, 800, and 820 °C. A maximum current density of −0.7Acm-2 was applicable under H2O electrolysis. A comparable performance was observed for co-electrolysis corroborated by current density independent syngas ratios of 9.0 and 4.0 when feeding H2/H2O/CO2-compositions of 20/70/10 and 20/60/20, respectively. Particular attention must be paid to thermal integration in the context of the implementation as a stand-alone system. The resulting operating maps related to maximum current densities, gas production and temperatures can be considered and used for simulation and design of the envisaged stand-alone system including the auxiliary power requirements.

AB - A state-of-the-art ten-layer solid oxide stack was electrochemically characterized and system-oriented experimentally investigated in reversible operation. The stack in question consists of 5YbSZ electrolyte supported planar cells promising high performance. The stack is integrated into a stackbox and is considered to be operated in an autonomous system, thus system-relevant operating conditions in terms of reversibility, inlet mixtures and temperatures were applied. A high fuel utilization, respectively reactant conversion of 80% in either mode was deployed in steady state experiments in a transient operation regime. Polarization curves were dynamically recorded and electrochemical impedance spectroscopy was performed to evaluate the performance of the stack in reversible operation feeding hydrogen and/or carbonaceous gases. Recorded temperature profiles obtained by means of thermocouples placed directly on the air electrodes showed distinct characteristics with a maximum deviation of 24.8K in the exothermic and 14.9K in the endothermic operating mode. The stack showed a small dependency on the applied operating temperatures of 780, 800, and 820 °C. A maximum current density of −0.7Acm-2 was applicable under H2O electrolysis. A comparable performance was observed for co-electrolysis corroborated by current density independent syngas ratios of 9.0 and 4.0 when feeding H2/H2O/CO2-compositions of 20/70/10 and 20/60/20, respectively. Particular attention must be paid to thermal integration in the context of the implementation as a stand-alone system. The resulting operating maps related to maximum current densities, gas production and temperatures can be considered and used for simulation and design of the envisaged stand-alone system including the auxiliary power requirements.

KW - Reversible Solid Oxide Cell

KW - Characterization

KW - Electrolyte supported cell

KW - 10 layer stack

KW - EIS

KW - Steady state operation

KW - Transient operation

U2 - 10.1016/j.apenergy.2019.113695

DO - 10.1016/j.apenergy.2019.113695

M3 - Article

VL - 254

JO - Applied Energy

JF - Applied Energy

SN - 0306-2619

M1 - 113695

ER -