Cathodic polarization of strontium-doped lanthanum ferrite in proton-conducting solid oxide fuel cell

Yamaura, Hiroyuki; Ikuta, Tetsuya; Yahiro, Hidenori; Okada, Genji

doi:10.1016/j.ssi.2004.08.008

Cited by 82 publications

(40 citation statements)

References 19 publications

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“…In the case of the composite cathodes, the larger values of ASR2 suggest that dissociative oxygen adsorption became the rate limiting step. Previously, Yamaura et al [8] have found that the charge transfer process was the rate limiting step for pure La 1-x Sr x FeO 3-d cathode applied on a proton conductor electrolyte.…”

Section: Optimisation Of Cathode Materials Compositionmentioning

confidence: 99%

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Composite Cathodes for Proton Conducting Electrolytes

et al. 2009

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Different composite materials made of mixed protonic/electronic conductors, SrCe0.9Yb0.1O3–δ (10YbSC) or BaCe0.9Yb0.1O3–δ (10YbBC), and a mixed oxygen‐ion/electronic conductor, La0.6Sr0.4Co0.2Fe0.8O3 (LSCF), were investigated for cathode application in intermediate temperature solid oxide fuel cells (IT‐SOFCs) using a high temperature proton conducting BaCe0.8Y0.2O3–δ electrolyte. Only the LSCF/10YbBC composite was found to be chemically stable. Area specific resistance (ASR) measurements were performed in wet air for LSCF/10YbBC cathodes, changing the weight ratio between the phases and the sintering procedure. The best performance was obtained for the composite cathode containing 50 wt.‐% of LSCF and 50 wt.‐% of 10YbBC, sintered at 1,100 °C. Electrochemical impedance spectroscopy (EIS) measurements of the tested cathodes showed two depressed semicircles in the middle and low frequency range, respectively. Performing ASR measurements at different p O 2 allowed us to attribute the two semicircles to charge transfer and oxygen diffusion processes, respectively. The microstructure of the LSCF/10YbBC(1:1) composite cathode was optimised changing the ratio of the particle sizes between the two phases. The lowest ASR values (0.14 Ω cm2 at 700 °C) were observed for the LSCF/10YbBC(1:1) composite cathode with different particle size (sub‐micrometer particles for LSCF and nanometer particles for 10YbBC). Fuel cell polarisation curves demonstrated superior performance of the LSCF/10YbBC (1:1) cathode with respect to Pt.

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Section: Optimisation Of Cathode Materials Compositionmentioning

confidence: 99%

“…ASR measurements performed at different oxygen partial pressures allow to correlate each semicircle in the complex impedance plane plot to a specific electrode process [8,13,24,25,33]. ASR is proportional to p Àn as the contribution of the adsorption/diffusion process [33,34].…”

Section: Optimisation Of Cathode Materials Compositionmentioning

confidence: 99%

Composite Cathodes for Proton Conducting Electrolytes

et al. 2009

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“…Efforts have been devoted to lowering the cathode polarization resistance for H-SOFCs by introducing novel cathode materials [5][6][7][8][9]. With Ba(Ce 0.8 Gd 0.2 )O 2.9 as electrolyte, Iwahara et al [5] have used (La 0.6 Ba 0.4 )MnO 3 and platinum as cathodes, and cathode polarization resistances were about 1.42 and 0.35 cm 2 at 800 • C, respectively.…”

Section: Introductionmentioning

confidence: 99%

Nano-sized Sm0.5Sr0.5CoO3−δ as the cathode for solid oxide fuel cells with proton-conducting electrolytes of BaCe0.8Sm0.2O2.9

Zhao

Peng

et al. 2009

Electrochimica Acta

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“…To date, only a few studies have been reported on oxide cathode compatible with proton conductors. [13] [14,15] Yet, the electrode performances are inadequate for practical applications, due most likely to limited active sites for oxygen reduction at the interface between the proton-conducting electrolyte and the oxygen ion conducting cathodes. Indeed, it has been previously shown that the interface between SSC cathode and Y-doped BaCeO 3 electrolyte was quite resistive.…”

mentioning

confidence: 99%