Investigating oxygen reduction pathways on pristine SOFC cathode surfaces by <i>in situ</i> PLD impedance spectroscopy

Siebenhofer, Matthäus; Riedl, Christoph; Schmid, Alexander; Limbeck, Andreas; Opitz, Alexander Karl; Fleig, Jürgen; Kubicek, Markus

doi:10.1039/d1ta07128a

Cited by 25 publications

(51 citation statements)

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“… 9 An in-depth mechanistic discussion of the relation between polarization resistance and defect chemistry is beyond the scope of the present work but can be found in a separate study. 20 …”

Section: Resultsmentioning

confidence: 99%

“…This way of normalization has already been proven meaningful in previous studies, where it was demonstrated that only the area above the YSZ is electrochemically active for oxygen reduction, while the regions above the current collector grid are inactive due to relatively low ionic in-plane conduction. 8 The surface-related polarization resistances of all materials at 0. of the relation between polarization resistance and defect chemistry is beyond the scope of the present work but can be found in a separate study 20 .…”

Section: Surface-related Polarization Resistance Of Pristine Electrod...mentioning

confidence: 93%

“…: about 1 Ω cm 2 for dense LSC thin films at 600 °C in air 14 ). Moreover, in situ impedance measurements inside of the PLD chamber revealed even lower resistances (1 Ω cm 2 at 600 °C and 0.04 mbar O 2 ) 20 However, such low resistances could never be reproduced in ex situ setups. Additionally a strong increase of their polarization resistance is observed over time, which is usually called “degradation”.…”

Section: Introductionmentioning

confidence: 94%

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In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

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Section: Resultsmentioning

confidence: 99%

Section: Surface-related Polarization Resistance Of Pristine Electrod...mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 94%

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In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

et al. 2022

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“…It is therefore not surprising that the bias dependence of R s is also different for the measurements of this study. Moreover, the oxygen exchange rates are strongly affected by defect concentrations (holes, oxygen vacancies) , and those vary with the applied anodic bias. Finally, also some surface changes at high voltages may occur .…”

Section: Resultsmentioning

confidence: 99%

Formation and Detection of High-Pressure Oxygen in Closed Pores of La_0.6Sr_0.4CoO_3−δ Solid Oxide Electrolysis Anodes

Krammer

Schmid

Siebenhofer

et al. 2022

ACS Appl. Energy Mater.

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The chemical capacitance of La 0.6 Sr 0.4 CoO 3−δ (LSC) thin film microelectrodes with different microstructures was investigated upon varying anodic DC voltages. Dense and porous electrodes (open porosity) were prepared by using different parameters during pulsed laser deposition (PLD). Furthermore, electrodes with closed porosity were fabricated by depositing a dense capping layer on a porous film. Electrochemical impedance spectroscopy (EIS) was performed in synthetic air at 460 and 608 °C with anodic DC voltages up to 440 mV. Chemical capacitance values of the electrodes were derived from the obtained spectra. While the chemical capacitance of dense and porous electrodes decreased as expected with increasing anodic overpotential, electrodes with closed pores exhibited very unusual peaks with extremely high values of >8000 F/cm 3 at overpotentials of >100 mV. We demonstrate that this huge capacitance increase agrees very well with calculated chemical capacitances deduced from a real gas equation. Hence, we conclude that the formation of highly pressurized oxygen (up to gas pressures of ∼10 4 bar) in closed pores is responsible for this strong capacitive effect at anodic overpotentials. Such measurements can thus detect and quantify the buildup of high internal gas pressures in closed pores at the anode side of solid oxide electrolysis cells.

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“…The PLD has been utilized to deposit porous perovskite electrodes, 157‐160 electrolytes layers such as CGO, 161,162 YSZ, 163 and SDC/LSGM bilayers 164 so far. The exact transfer of the composition of LSGM was not possible through PLD 165 .…”

Section: Fabrication Techniques For Sofcsmentioning

confidence: 99%

A review on materials, advantages, and challenges in thin film based solid oxide fuel cells

Chasta

Himanshu

Dhaka

2022

Intl J of Energy Research

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Summary In accomplishment of massive energy demand, the solid oxide fuel cells (SOFCs) have proven as apotheosis candidates due to their high energy conversion efficiencies, low pollution exhaust, fuel flexibility, and environmental friendliness which make these the most promising alternatives to conventional electricity generators. Despite numerous advantages of SOFCs, large‐scale industrial applications are yet to be realized owing to their high operating temperatures (800°C‐1000°C). To lower the operating temperature, it is crucial to minimize ionic resistances which can be accomplished by reducing the electrolyte thickness to lesser than 5 μm. Therefore, present article embraces a concise review on conventional materials, designs, and generations of SOFCs with their compatibility and drawbacks. The strengths and limitations of conventional and advanced tools for fabricating thin film based SOFCs (TF‐SOFCs) as well as the associated properties of electrolytes and electrodes are thoroughly examined, and further route cast is provided to attain better performance. The present review encourages the development of TF‐SOFCs using advanced techniques employing ultrathin single and bilayer electrolytes which can have potential to reduce the operating temperature of SOFCs from 450°C to 600°C region and pave the way for global commercialization.

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Investigating oxygen reduction pathways on pristine SOFC cathode surfaces by in situ PLD impedance spectroscopy

Abstract: Temperature and p(O2) dependences of the oxygen exchange kinetics of SOFC cathode materials were correlated with point defect concentrations. Defect chemical contributions were identified as a major part of effectively measured activation energies.

Cited by 25 publications

References 77 publications

In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

Formation and Detection of High-Pressure Oxygen in Closed Pores of La_0.6Sr_0.4CoO_3−δ Solid Oxide Electrolysis Anodes

A review on materials, advantages, and challenges in thin film based solid oxide fuel cells

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Investigating oxygen reduction pathways on pristine SOFC cathode surfaces by in situ PLD impedance spectroscopy

Abstract: Temperature and p(O2) dependences of the oxygen exchange kinetics of SOFC cathode materials were correlated with point defect concentrations. Defect chemical contributions were identified as a major part of effectively measured activation energies.

Cited by 25 publications

References 77 publications

In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

In situ techniques reveal the true capabilities of SOFC cathode materials and their sudden degradation due to omnipresent sulfur trace impurities

Formation and Detection of High-Pressure Oxygen in Closed Pores of La0.6Sr0.4CoO3−δ Solid Oxide Electrolysis Anodes

A review on materials, advantages, and challenges in thin film based solid oxide fuel cells

Contact Info

Product

Resources

About

Formation and Detection of High-Pressure Oxygen in Closed Pores of La_0.6Sr_0.4CoO_3−δ Solid Oxide Electrolysis Anodes