On the role of surfaces and interfaces in electrochemical performance and long-term stability of nanostructured LSC thin film electrodes

Develos-Bagarinao, Katherine; Çelikbilek, Ӧzden; Budiman, Riyan Achmad; Kerherve, Gwilherm; Fearn, Sarah; Skinner, Stephen; Kishimoto, Haruo

doi:10.1039/d1ta07235h

Cited by 4 publications

(7 citation statements)

References 41 publications

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“…This process may be related to the gas diffusion process in the porous cathode and it is just slightly dependent on the temperature but strongly dependent on the microstructural features . The identified electrode processes are identical to the results of other groups performing the DRT analysis of thin LSC electrodes. , …”

Section: Resultssupporting

confidence: 79%

“…In the other work, Develos-Bagarinao et al investigated the influence of the deposition temperature and long-term annealing on LSC thin films deposited by pulsed layer deposition (PLD). 29 In their research, a significant improvement in the electrode perform- ance was also achieved by enhancing the surface exchange property as mediated by a distinctive nanostructure that retains the high porosity and the better stability of the electrode− electrolyte interfaces. 29…”

Section: Influence Of Annealingmentioning

confidence: 99%

“…29 In their research, a significant improvement in the electrode perform- ance was also achieved by enhancing the surface exchange property as mediated by a distinctive nanostructure that retains the high porosity and the better stability of the electrode− electrolyte interfaces. 29…”

Section: Influence Of Annealingmentioning

confidence: 99%

“…32 The identified electrode processes are identical to the results of other groups performing the DRT analysis of thin LSC electrodes. 29,33 The DRT analysis of the EIS data measured at different p(O 2 )s and temperatures made it possible to distinguish processes occurring in the investigated electrode and gave a hint for fitting the equivalent circuits to the EIS spectra. Figure 6A presents representative EIS spectra with fitted elements corresponding to the identified electrochemical processes.…”

Section: Impedance Data Analysismentioning

confidence: 99%

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Tuning Electrochemical Performance by Microstructural Optimization of the Nanocrystalline Functional Oxygen Electrode Layer for Solid Oxide Cells

Kamecki

Cempura

Jasiński

et al. 2022

ACS Appl. Mater. Interfaces

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Further development of solid oxide fuel cell (SOFC) oxygen electrodes can be achieved through improvements in oxygen electrode design by microstructure miniaturization alongside nanomaterial implementation. In this work, improved electrochemical performance of an La0.6Sr0.4Co0.2Fe0.8O3‑d (LSCF) cathode was achieved by the controlled modification of the La0.6Sr0.4CoO3‑d (LSC) nanocrystalline interlayer introduced between a porous oxygen electrode and dense electrolyte. The evaluation was carried out for various LSC layer thicknesses, annealing temperatures, oxygen partial pressures, and temperatures as well as subjected to long-term stability tests and evaluated in typical operating conditions in an intermediate temperature SOFC. Electrochemical impedance spectroscopy and a distribution of relaxation times analysis were performed to reveal the rate-limiting electrochemical processes that limit the overall electrode performance. The main processes with an impact on the electrode performance were the adsorption of gaseous oxygen O2, dissociation of O2, and charge transfer-diffusion (O2–). The introduction of a nanoporous and nanocrystalline interlayer with extended electrochemically active surface area accelerates the oxygen surface exchange kinetics and oxygen ion diffusions, reducing polarization resistances. The polarization resistance of the reference LSCF was lowered by one order of magnitude from 0.77 to 0.076 Ω·cm2 at 600 °C by the deposition of a 400 nm LSC interlayer at the interface. The developed electrode tested in the anode-supported fuel cell configuration showed a higher cell performance by 20% compared to the cell with the reference electrode. The maximum power density at 700 °C reaches 675 and 820 mW·cm–2 for the reference cell and the cell with the LSC interlayer, respectively. Aging tests at 700 °C under a high load of 1 A·cm2 were performed.

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Section: Resultssupporting

confidence: 79%

Section: Influence Of Annealingmentioning

confidence: 99%

Section: Influence Of Annealingmentioning

confidence: 99%

Section: Impedance Data Analysismentioning

confidence: 99%

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Tuning Electrochemical Performance by Microstructural Optimization of the Nanocrystalline Functional Oxygen Electrode Layer for Solid Oxide Cells

Kamecki

Cempura

Jasiński

et al. 2022

ACS Appl. Mater. Interfaces

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“…The deposition temperature was set at 500 °C, 300 °C, and room temperature (no heating). Film preparation details have been reported elsewhere (9). After deposition, the films were post-annealed in a box furnace at 700 °C for 300 h in air.…”

Section: Sample Preparationmentioning

confidence: 99%

Nanostructured LSC Thin Film Electrodes with Improved Electrochemical Performance and Long-Term Stability

Bagarinao¹,

Çelikbilek²,

Kerherve³

et al. 2023

ECS Trans.

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Nanostructured La0.6Sr0.4CoO3- δ (LSC) thin film electrodes exhibit exceptionally high oxygen surface exchange properties, surpassing those of conventional microscale electrode structures, which are desirable for application in solid oxide cells (SOCs). Here, towards the goal of improving the long-term stability of electrochemical performance of nanostructured LSC thin films, a systematic investigation of the effect of processing temperatures on long-term stability was carried out. By varying the deposition temperature (from 500 °C to room temperature), the as-grown characteristic nanostructures of LSC thin films prepared using pulsed laser deposition can be tuned from highly dense nanocolumnar grains to nanofibrous structures with high porosity. From the comparison of the properties of the as-grown films and those annealed at 700 °C for 300 h, it was revealed that LSC thin films prepared at lower deposition temperatures are less prone to the grain sintering effect and cation interdiffusion and exhibit better interfacial stability and improved long-term performance.

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Emerging Trends in Solid Oxide Electrolysis Cells

Tarancón

Torrell

Baiutti

et al. 2023

Lecture Notes in Energy

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On the role of surfaces and interfaces in electrochemical performance and long-term stability of nanostructured LSC thin film electrodes

Abstract: Nanostructured La0.6Sr0.4CoO3−δ (LSC) thin film electrodes with higher porosities exhibit better electrochemical performance and long-term stability owing to enhanced surface exchange properties and suppressed cation diffusion across interfaces.

Cited by 4 publications

References 41 publications

Tuning Electrochemical Performance by Microstructural Optimization of the Nanocrystalline Functional Oxygen Electrode Layer for Solid Oxide Cells

Tuning Electrochemical Performance by Microstructural Optimization of the Nanocrystalline Functional Oxygen Electrode Layer for Solid Oxide Cells

Nanostructured LSC Thin Film Electrodes with Improved Electrochemical Performance and Long-Term Stability

Emerging Trends in Solid Oxide Electrolysis Cells

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