Electrochemical characterization of La2NiO4-infiltrated La0.6Sr0.4Co0.2Fe0.8O3-δ by analysis of distribution of relaxation times

Ghamarinia, Mitra; Babaei, Alireza; Zamani, Cyrus

doi:10.1016/j.electacta.2020.136520

Cited by 30 publications

(9 citation statements)

References 46 publications

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“…Peaks P1b are located below 100 Hz in Figure 6a. According to literature and the observations done in this work, the peak might be influenced by the diffusion processes in the bulk of the cathode (23,35,36). The peaks P2 in Figure 6b, Figure 6c and Figure 6d are located at around 200 Hz and are all about the same size.…”

Section: Distribution Of Relaxation Timessupporting

confidence: 63%

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Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

et al. 2021

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Modern societies require a reliable and sustainable energy supply, which can be achieved by solid oxide fuel cells (SOFCs). SOFCs run with a variety of fuels such as methane containing reformates. It is possible to utilize methane directly in SOFCs, but it can cause degradation of the fuel cells anode. However, irreversible degradation can be prevented, when identifying degradation mechanisms at an early stage by online monitoring tools. We used electrochemical impedance spectroscopy and its advanced tool distribution of relaxation times (DRT) method. The operating conditions were varied in order to determine the relevant system behavior as a response to the corresponding methane utilization processes. The tested electrolyte supported cells have an active area of 81cm² and are tested under different reforming conditions. The holistic approach of this work combines thermal, electrical, electrochemical measurement methods and gas analysis to show the influence of methane utilization on the DRT spectra.

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Section: Distribution Of Relaxation Timessupporting

confidence: 63%

“…The peak P1 of Ext. 1a (at ~10 Hz) could be influenced by processes at the anode such as fuel starvation or surface exchange and diffusion processes in the cathode (23,(34)(35)(36). Like P1a of Ext.…”

Section: Distribution Of Relaxation Timesmentioning

confidence: 99%

Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

et al. 2021

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“…7 The former is an intensive quantity, while the latter is of extensive nature, leading to two different optimisation tasks. Strategies to enhance intrinsic activity include the investigation of new material structures [8][9][10] and compositions, 11,12 engineering interfaces, 13 strain states [14][15][16] and defect landscapes, [17][18][19] and the decoration of surfaces with catalytic nanoparticles via inltration, 20,21 hetero-structuring 22 and exsolution 23,24 to alter surface termination and surface electronic states. On the other hand, apparent activity can be tuned by extending the active electrode area due to enhanced ionic conductivity (mainly in mm thick porous electrodes), or via increasing the specic surface area (SSA, e.g.…”

Section: Introductionmentioning

confidence: 99%

Tailored nano-columnar La₂NiO₄ cathodes for improved electrode performance

Stangl¹,

Riaz²,

Rapenne³

et al. 2022

J. Mater. Chem. A

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“…The DRT analysis confirms that the cathode response is formed by two main electrode contributions, attributed to the oxide ion transfer between the cathode/electrolyte interface and the oxygen surface exchange process at a high (HF) and low (LF) frequency, respectively (Figure 4c-e) [34]. In addition, a small process due to gas diffusion limitations into the electrode, labelled as D, has been identified at a low frequency [35].…”

Section: Electrochemical Propertiesmentioning

confidence: 52%

Influence of Bi1.5Y0.5O3 Active Layer on the Performance of Nanostructured La0.8Sr0.2MnO3 Cathode

et al. 2020

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The efficiency of solid oxide fuel cell cathodes can be improved by microstructural optimization and using active layers, such as doped bismuth oxides. In this work, Bi1.5Y0.5O3 (BYO) films are prepared by spray-pyrolysis deposition at reduced temperatures on a Zr0.84Y0.16O1.92 (YSZ) electrolyte. The influence of the BYO film on the performance of an La0.8Sr0.2MnO3 (LSM) cathode prepared by traditional screen-printing and spray-pyrolysis is investigated. A complete structural, morphological, and electrochemical characterization is carried out by X-ray diffraction, electron microscopy, and impedance spectroscopy. The incorporation of BYO films decreases the Area Specific Resistance (ASR) of screen-printed cathodes from 6.4 to 2.2 Ω cm2 at 650 °C. However, further improvements are observed for the nanostructured electrodes prepared by spray-pyrolysis with ASRs of 0.55 and 1.15 Ω cm2 at 650 °C for cathodes with and without an active layer, respectively. These results demonstrate that microstructural control using optimized fabrication methods is desirable to obtain high-efficiency electrodes for solid oxide fuel cell (SOFC) applications.

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Electrochemical characterization of La2NiO4-infiltrated La0.6Sr0.4Co0.2Fe0.8O3-δ by analysis of distribution of relaxation times

Cited by 30 publications

References 46 publications

Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

Tailored nano-columnar La₂NiO₄ cathodes for improved electrode performance

Influence of Bi1.5Y0.5O3 Active Layer on the Performance of Nanostructured La0.8Sr0.2MnO3 Cathode

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Electrochemical characterization of La2NiO4-infiltrated La0.6Sr0.4Co0.2Fe0.8O3-δ by analysis of distribution of relaxation times

Cited by 30 publications

References 46 publications

Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

Experimental Investigation of Electrochemical Reactions Along SOFCs for Internal and External Reformed Methane

Tailored nano-columnar La2NiO4 cathodes for improved electrode performance

Influence of Bi1.5Y0.5O3 Active Layer on the Performance of Nanostructured La0.8Sr0.2MnO3 Cathode

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Product

Resources

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Tailored nano-columnar La₂NiO₄ cathodes for improved electrode performance