Influence of sintering temperature on morphology and electrochemical performance of LSCF/GDC composite films as efficient cathode for SOFC

Çelikbilek, Ӧzden; Siebert, Elisabeth; Jauffrès, David; Martín, Christophe; Djurado, Elisabeth

doi:10.1016/j.electacta.2017.06.070

Cited by 44 publications

(27 citation statements)

References 37 publications

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“…46 It was shown on as-prepared symmetrical cells that the electrochemical characterization does not give rise to any chemical changes. 31 32,47) to a new rate-limiting step. This is likely to be associated with the occurrence of the secondary phase, SrZrO 3 .…”

Section: Performancementioning

confidence: 99%

Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Szász

Wankmüller

Wilde

et al. 2018

J. Electrochem. Soc.

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Interdiffusion phenomena and secondary phase formation at the interface La 0.58 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) / Gd 0.2 Ce 0.8 O 2-δ (GDC) / Y 0.16 Zr 0.84 O 2-δ (YSZ) are correlated to linear and non-linear losses in symmetrical and full SOFC cells. FIB/SEM (focussed ion beam / scanning electron microscopy) tomography is applied for determining the local distribution of the primary phases LSCF, GDC, and YSZ and elemental analysis via STEM/EDXS (scanning transmission electron microscopy / energy dispersive X-ray spectroscopy) provides information on the secondary phase SrZrO 3 (SZO) and the interdiffusion between GDC and YSZ (ID). This reveals the effect of GDC co-sintering temperature (varied from 1100 • C to 1400 • C), alongside the sintering of LSCF at 1080 • C, on these multi-layered microstructures. Electrochemical impedance spectra on symmetrical cells show that the polarization resistance (ASR cat) of the cathode/electrolyte interface is pronouncedly affected by three orders of magnitude, changing the overall power density of anode supported SOFC single cells at 0.8V by as much as a factor of 20. In conclusion, the chemical composition of the ID has a tremendous impact on the electrochemical efficiency of the investigated LSCF/GDC/YSZ interface, and processing parameters of anode supported cells with LSCF cathode have to be carefully chosen for individual SOFC cell concepts.

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Section: Performancementioning

confidence: 99%

Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Szász

Wankmüller

Wilde

et al. 2018

J. Electrochem. Soc.

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“…In these models, L o represents the inductance arising from equipment and cables during the measurements [28]. While R s exhibits the ohmic resistance caused by electrolyte GDC 10 and wires [29]. According to Li et al, the components (R l C l ), (R m C m ) and (R h C h ) exhibit reaction steps in the low-frequency (LF), medium-frequency (MF) and high-frequency (HF) range, respectively [30].…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile a 60:40 NiO + GDC 10 anode was also deposited on the GDC 10 electrolyte pellet, opposite to the cathode area, by SP, where the rectangular saw-tooth shape sticker covered the cathode layer to control the shape of the anode, and provided a space between the anode and cathode area. In order to obtain high porosity for the adsorption of gas and increase the electrochemical power density [28,29], this pellet was co-sintered at 1100 • C with a heating rate of 10 • C min −1 for 10 h under an atmosphere as shown in figure 2c. The symmetrical µ-SOFC with a 50:50 BYCF+GDC 10 |50:50 NiO+GDC 10 |GDC 10 was fabricated using the same process as the full µ-SOFC for measuring impedance spectra.…”

Section: Methodsmentioning

confidence: 99%

A novel micro-solid oxide fuel cell ( $$\upmu $$ μ -SOFC) for detecting methane content in biogas

et al. 2019

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A novel micro-solid oxide fuel cell (µ-SOFC), with a rectangular saw-tooth shape, was designed with a 50 wt% BYCF + 50 wt% GDC 10 cathode and a 60 wt% NiO + 40 wt% GDC 10 anode deposited on a GDC 10 electrolyte substrate by the spray pyrolysis technique. µ-SOFC receives methane only (CH 4) as fuel gas from one side. The fuel gas was applied at a flow rate of 0.2 l min −1. The power density obtained was 1.0 µW at 800 • C. Voltage levels generated by the µ-SOFC at 40-99.99% CH 4 was highly accurate representing the quantity of CH 4. Low accuracy was observed at 10-30% of CH 4. Therefore, µ-SOFC is an application of SOFC technology to be a sensor for economically detecting CH 4 in a biogas system, while being capable of operating in humid conditions at high temperatures.

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“…In previous work, we studied the influence of sintering temperature on the electrochemical properties of similar LSCF-based films. 33 The impedance spectra showed that the charge-transfer resistance at the high-frequency semicircle was convoluted with the non-charge transfer processes (solid-state transport and oxygen surface exchange). However, as the chemical capacitance values of this semicircle (~10 -2 -10 -3 F cm -2 ) were one-to-two orders of magnitude higher than the typical double layer capacitance values (< 10 -4 F cm -2 ), the limiting reaction steps of these LSCF-based films were attributed to non-charge-transfer reactions.…”

Section: [111]mentioning

confidence: 99%

Enhanced catalytic activity of nanostructured, A-site deficient (La_0.7Sr_0.3)_0.95(Co_0.2Fe_0.8)O_3−δ for SOFC cathodes

et al. 2019

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Influence of sintering temperature on morphology and electrochemical performance of LSCF/GDC composite films as efficient cathode for SOFC

Cited by 44 publications

References 37 publications

Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

A novel micro-solid oxide fuel cell ( $$\upmu $$ μ -SOFC) for detecting methane content in biogas

Enhanced catalytic activity of nanostructured, A-site deficient (La_0.7Sr_0.3)_0.95(Co_0.2Fe_0.8)O_3−δ for SOFC cathodes

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Influence of sintering temperature on morphology and electrochemical performance of LSCF/GDC composite films as efficient cathode for SOFC

Cited by 44 publications

References 37 publications

Nature and Functionality of La0.58Sr0.4Co0.2Fe0.8O3-δ/ Gd0.2Ce0.8O2-δ/ Y0.16Zr0.84O2-δInterfaces in SOFCs

Nature and Functionality of La0.58Sr0.4Co0.2Fe0.8O3-δ/ Gd0.2Ce0.8O2-δ/ Y0.16Zr0.84O2-δInterfaces in SOFCs

A novel micro-solid oxide fuel cell ( $$\upmu $$ μ -SOFC) for detecting methane content in biogas

Enhanced catalytic activity of nanostructured, A-site deficient (La0.7Sr0.3)0.95(Co0.2Fe0.8)O3−δ for SOFC cathodes

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Product

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Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Nature and Functionality of La_0.58Sr_0.4Co_0.2Fe_0.8O_3-δ/ Gd_0.2Ce_0.8O_2-δ/ Y_0.16Zr_0.84O_2-δInterfaces in SOFCs

Enhanced catalytic activity of nanostructured, A-site deficient (La_0.7Sr_0.3)_0.95(Co_0.2Fe_0.8)O_3−δ for SOFC cathodes