Synthesis, characterization, fabrication, and electrochemical performance of transition metal doped LSCTA- as anode candidates for SOFCS

Muzaffar, Nazan; Arshad, Nasima; Firdous, Naila; Drasbæk, Daniel Bøgh; Sudireddy, Bhaskar Reddy; Holtappels, Peter

doi:10.1016/j.matchemphys.2021.124875

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…The catalytic activity as well as conductivity of LST as a fuel electrode has been demonstrated to be improved also by B-site doping with Fe, Ni, Ru, Mo, or other transition metal cations. − …”

Section: Introductionmentioning

confidence: 99%

Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Paydar

Kooser

Möller

et al. 2022

ACS Appl. Energy Mater.

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Development of active ceramic hydrogen electrodes with high stability is an important challenge for developing solid oxide fuel cells (SOFC). Herein, a set of cubic perovskite-type La/Ca/Fe-doped strontium titanates, La 0.2 Sr 0.7−x Ca x Ti 0.95 Fe 0.05 O 3-δ (LSCTF), was synthesized. Their crystallographic and electrical properties, catalytic activity, and stability, as well as performance as fuel electrodes in the solid oxide fuel cell (SOFC) have been evaluated. It was confirmed by the results that the LSCTF behave like semiconductors, and the conductivity, catalytic activity, and stability of the electrodes significantly depend on the Ca concentration in the A-site. In the case of an optimal composition of the La 0.2 Sr 0.35 Ca 0.35 Ti 0.95 Fe 0.05 O 3−δ fuel electrode, a polarization resistance value of 0.21 Ω cm 2 at 850 °C in a humidified (1.7% H 2 O) H 2 atmosphere was obtained. During the stability test, the fuel cell with the 50 wt % La 0.2 Sr 0.35 Ca 0.35 Ti 0.95 Fe 0.05 O 3−δ + 50 wt % Ce 0.9 Gd 0.1 O 2−δ anode showed a power density of 322 mW cm −2 at 850 °C in a 98.3% H 2 + 1.7% H 2 O atmosphere.

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Section: Introductionmentioning

confidence: 99%

Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Paydar

Kooser

Möller

et al. 2022

ACS Appl. Energy Mater.

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“…When electrodes are sintered at higher temperature more Sr 2+ is moving into the GDC layer and forming poorly conducting SrZrO 3 into the GDC/electrolyte interlayer. Due to the porosity of the GDC layer, migration of Sr 2+ into the GDC/electrolyte interlayer continues during the operation of the cell thus causing increase of the R s values (11). Spray pyrolysis provides initially quite amorphous powders, and the needed phase forms only during calcination.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Sr₂Fe_1,5Mo_0,5O_6-δ Based Solid Oxide Electrolysis Cells

Salvan¹,

Lust²,

Nurk³

et al. 2023

ECS Trans.

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Solid oxide electrolysis cells were made with (La0,6Sr0,4)0,99Co0,96Ti0,04O3-δ (LSCT) and (La0.6Sr0.4)0.95Co0.2Fe0.8O3-δ (LSCF) air electrode materials and Sr2Fe1.5Mo0.5O6-δ (SFM) and SFM/ Ce1-xGdxO2−δ (GDC) fuel electrodes. LSCF has shown significantly higher electrochemical activity when compared to LSCT electrode while at the same time LSCT has proven to be more stable. SFM/GDC fuel electrode demonstrates significant electrochemical activity in electrolysis mode when compared to pure SFM electrode. Additionally, modified method to synthesize electrode powders with different particle size distributions via spray pyrolysis method was developed.

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“…13,23 Further B-site doping with transition metals (Fe, Ni) for LST can improve the conductivity as well as the catalytic activity of LST fuel electrode. 33,34 In this study the influence of A-site modifications on the physical properties, electrical and electrochemical performance of 5% A-site deficient La 0.21 Sr 0.74−x Ca x Ti 0.95 Fe 0.05 O 3−δ (x = 0.26 -0.69) (LSCTF5-x) hydrogen electrode has been investigated. The properties of LSCTF5-x, described in this study have been compared to properties of La 0.2 Sr 0.7-x Ca x Ti 0.95 Fe 0.05 O 3−δ (LSCTF10-x) with 10% A-site deficiency with exactly the same La/Sr/Ca ratios as well as the same techniques used for synthesis and testing of the electrodes.…”

mentioning

confidence: 99%

Influence of A-Site Modifications on the Properties of La_0.21Sr_0.74−xCa_xTi_0.95Fe_0.05O_3−δ Based Fuel Electrode for Solid Oxide Cell

Paydar

Kooser

Möller

et al. 2023

J. Electrochem. Soc.

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To make solid oxide fuel cell (SOFC) systems commercially attractive it’s essential to reduce manufacturing cost and improve the stability of membrane electrode assembly (MEA). Here, the influence of A-site modification on electrical and electrochemical performance of 5% A-site deficient La0.21Sr0.74-xCaxTi0.95Fe0.05O3-δ (x=0.26-0.69) (LSCTF5-x) hydrogen electrode has been studied. Results indicate that A-site deficiency and Ca concentration in A-site influence the conductivity, catalytic activity, and stability of the electrodes considerably. The highest stability was observed in the case of La0.21Sr0.26Ca0.48Ti0.95Fe0.05O3- δ anode composition. The maximal total electrical conductivity of porous electrode layer made of LSCFT5-x was 3.5 S cm−1 at 850°C characteristic of the La0.211Sr0.26Ca0.48Ti0.95Fe0.05O3-δ material in 97% H2 + 3% H2O atmosphere. The best electrochemical performance was observed in the case of La0.21Sr0.37Ca0.37Ti0.95Fe0.05O3-δ, which showed polarization resistance value equal to 0.44 Ω cm2 after 100 hours of stabilization at 800℃ in humidified (1.7% H2O) H2 atmosphere. During the stability test the fuel cell with optimal anode composition 50 wt% La0.21Sr0.26Ca0.48Ti0.95Fe0.05O3-δ + 50 wt% Ce0.9Gd0.1O2- showed power density of 437 mW cm-2 at 850℃ in 98.3% H2 + 1.7% H2O atmosphere.

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Synthesis, characterization, fabrication, and electrochemical performance of transition metal doped LSCTA- as anode candidates for SOFCS

Cited by 4 publications

References 26 publications

Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Characterization of Sr₂Fe_1,5Mo_0,5O_6-δ Based Solid Oxide Electrolysis Cells

Influence of A-Site Modifications on the Properties of La_0.21Sr_0.74−xCa_xTi_0.95Fe_0.05O_3−δ Based Fuel Electrode for Solid Oxide Cell

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Synthesis, characterization, fabrication, and electrochemical performance of transition metal doped LSCTA- as anode candidates for SOFCS

Cited by 4 publications

References 26 publications

Optimization of La0.2Sr0.7–xCaxTi0.95Fe0.05O3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Optimization of La0.2Sr0.7–xCaxTi0.95Fe0.05O3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Characterization of Sr2Fe1,5Mo0,5O6-δ Based Solid Oxide Electrolysis Cells

Influence of A-Site Modifications on the Properties of La0.21Sr0.74−xCaxTi0.95Fe0.05O3−δ Based Fuel Electrode for Solid Oxide Cell

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Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Optimization of La_0.2Sr_0.7–xCa_xTi_0.95Fe_0.05O_3−δ Fuel Electrode Stoichiometry for Solid Oxide Fuel-Cell Application

Characterization of Sr₂Fe_1,5Mo_0,5O_6-δ Based Solid Oxide Electrolysis Cells

Influence of A-Site Modifications on the Properties of La_0.21Sr_0.74−xCa_xTi_0.95Fe_0.05O_3−δ Based Fuel Electrode for Solid Oxide Cell