Sr and Zr diffusion in LSCF/10GDC/8YSZ triplets for solid oxide fuel cells (SOFCs)

Wang, Fangfang; Nishi, Mina; Brito, Manuel E.; Kishimoto, Haruo; Yamaji, Katsuhiko; Yokokawa, Harumi; Horita, Teruhisa

doi:10.1016/j.jpowsour.2014.02.046

Cited by 142 publications

(106 citation statements)

References 19 publications

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“…The conductivity in the combined YSZ electrolyte and GDC interlayer may be also degraded by the SrZrO 3 formation at the YSZ‐GDC interfaces . To evaluate this contribution, it is crucial to know the microstructural change associated with the SrZrO 3 formation.…”

Section: Conductivity Degradationmentioning

confidence: 99%

Recent Achievements of NEDO Durability Project with an Emphasis on Correlation Between Cathode Overpotential and Ohmic Loss

et al. 2017

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Long-term performance testes by CRIEPI (Central Research Institute for Electric Power Industry) on six industrial stacks have revealed an interesting correlation between cathode polarization loss and ohmic loss. To make clear the physicochemical meaning of this correlation, detailed analyses were made on the conductivity degradation of YSZ electrolyte in button cells and then on the ohmic losses in the industrial cells in terms of time constants which are determined from speed of the tetragonal transformation through the Y diffusion from the cubic phase to the tetragonal phase. In some cases, shorter time constants (faster degradations) were detected than those expected from the two-time-constant (with and without NiO reduction effects) model, suggesting that additional ohmic losses after subtracting the contribution from the tetragonal transformation must be caused from other sources such as cathode-degradation inducing effects. Main cathode degradations can be ascribed to sulfur poisoning due to contamination in air in the CRIEPI test site. An important feature was extracted as this cathode degradations became more severe when the gadolinium-doped ceria (GDC) interlayers were fabricated into dense film. Plausible mechanisms for cathode degradations were proposed based on the Sr/Co depletion on surface of lanthanum strontium cobalt ferrite (LSFC) in the active area. Peculiar cathode degradations found in stacks are interpreted in term of changes in surface concentration by reactions with sulfur oxide, electrochemical side reactions for water vapor emission or Sr volatilization, and diffusion of Sr/Co from inside LSCF.

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Section: Conductivity Degradationmentioning

confidence: 99%

Recent Achievements of NEDO Durability Project with an Emphasis on Correlation Between Cathode Overpotential and Ohmic Loss

et al. 2017

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“…After 26,000 h operation, Mn oxide precipitated along the grain boundaries in the middle of YSZ with crack formation. Since GDC is in contact with LSCF, the Co/Fe components can diffuse into GDC and this makes cation diffusion in GDC faster , . This provides the diffusion path of the Mn component into YSZ.…”

Section: Degradations Associated With Electrolytesmentioning

confidence: 99%

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

et al. 2019

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Achievements of NEDO durability projects on SOFC mode are summarized with a focus on the physicochemical mechanisms characterized by diffusion properties of cell components and chemical reactions of cell components with gaseous impurities. Ni sintering and depletion including impurity (P, B, S) effects have been examined in terms of the surface/interface energies of Ni/oxide cermet anodes. The conductivity degradation due to the transformation of the cubic YSZ electrolyte was found to be characterized in terms of two time constants for the reductive and the oxidative regions to be determined by the Y‐diffusivity and its enhancement on NiO internal reduction in YSZ, while observed gaps in conductivity degradation behavior between stacks and button cells were ascribed to differences in those physicochemical properties involved, namely cation diffusion and kinetics associated with NiO internal reduction. The cathode performance degradation due to sulfur poisoning exhibits a variety of dependences on the microstructure (dense or porous) of doped‐ceria interlayers, the thickness of YSZ electrolyte and the humidity in the anode atmosphere, suggesting effects of protons in the cathode vicinity and the SrO activity changes during fabrication the LSCF/GDC/YSZ multilayers. Some defect chemical considerations were made on how such defects are affected by fabrication processes.

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“…It has been shown that La 2 Zr 2 O 7 [1e3] or SrZrO 3 [4,5], with low electrical conductivity, are formed along the cathode/electrolyte interface in the course of preparation of solid oxide fuel cells (SOFCs). These byproducts negatively affect the performance of SOFCs.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al found the SrZrO 3 formation along both the cathode/interlayer and the interlayer/electrolyte interfaces as the result of Sr and Zr counter-directional diffusion through the grain boundary [5]. However, to date no detailed investigations have been carried out for the interface of electrolyte/ cathode-interlayer.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

Liang

Tao

Zhang

et al. 2016

Journal of Alloys and Compounds

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Sr and Zr diffusion in LSCF/10GDC/8YSZ triplets for solid oxide fuel cells (SOFCs)

Cited by 142 publications

References 19 publications

Recent Achievements of NEDO Durability Project with an Emphasis on Correlation Between Cathode Overpotential and Ohmic Loss

Recent Achievements of NEDO Durability Project with an Emphasis on Correlation Between Cathode Overpotential and Ohmic Loss

Achievements of NEDO Durability Projects on SOFC Stacks in the Light of Physicochemical Mechanisms

Asymmetric diffusion of Zr, Sc and Ce, Gd at the interface between zirconia electrolyte and ceria interlayer for solid oxide fuel cells

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