AC impedance behavior of a practical-size single-cell SOFC under DC current

Momma, Akihiko; Kaga, Yasuo; Takano, Kiyonami; Nozaki, Ken; Negishi, Akira; Kato, Ken; Kato, Tohru; Inagaki, Toru; Yoshida, Hiroyuki; Hosoi, Kei; Hoshino, Kazuki; Akbay, Taner; Akikusa, Jun; Yamada, Masaharu; Chitose, Norihisa

doi:10.1016/j.ssi.2004.06.014

Cited by 27 publications

(19 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is then concluded that the LF process corresponds to a diffusive limitation, known as gas conversion impedance. This evidence was also confirmed by the lineal dependence of the inverse of the flux vs. the LF polarization resistance, as reported by Momma et al [29]. As the HF and MF processes remain almost unaltered against both pH2 (hydrogen partial pressure) and flux of hydrogen, it is reasonable to assume that both contributions correspond to the LSM-YSZ oxygen electrode.…”

Section: Methodssupporting

confidence: 82%

Highly stable microtubular cells for portable solid oxide fuel cell applications

Monzón

Laguna‐Bercero

2016

Electrochimica Acta

View full text Add to dashboard Cite

Section: Methodssupporting

confidence: 82%

Highly stable microtubular cells for portable solid oxide fuel cell applications

Monzón

Laguna‐Bercero

2016

Electrochimica Acta

View full text Add to dashboard Cite

“…Furthermore fuel variations have a negligible impact on the electrode resistances ASR an and ASR ca compared to the overall resistance ASR tot . This behavior is also representative for other stacks with different cell types at OCV [21,28,29].…”

Section: Conceptual Approachmentioning

confidence: 53%

A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks

Linder

Hocker

Meier

et al. 2015

Journal of Power Sources

View full text Add to dashboard Cite

h i g h l i g h t sIdentification of fuel leakages and fuel distribution in SOFC stacks. Determination of internal resistances from (V,I)-data by eliminating fuel effects. Real-time, model-based identification of malfunctioning of SOFC stacks. Time dependent evolution of degradation phenomena from (V,I)-data. Simulated local species concentrations and current densities along fuel channels. a b s t r a c tReliable quantification and thorough interpretation of the degradation of solid oxide fuel cell (SOFC) stacks under real conditions is critical for the improvement of its long-term stability. The degradation behavior is often analyzed based on the evolution of currentevoltage (V,I) curves. However, these overall resistances often contain unavoidable fluctuations in the fuel gas amount and composition and hence are difficult to interpret. Studying the evolution of internal repeat unit (RU) resistances is a more appropriate measure to assess stack degradation. RU-resistances follow from EIS-data through subtraction of the gas concentration impedance from the overall steady-state resistance. In this work a model-based approach where a local equilibrium model is used for spatial discretization of a SOFC stack RU running on hydrocarbon mixtures such as natural gas. Since under stack operation, fuel leakages, uneven fuel distribution and varying natural gas composition can influence the performance, they are taken into account by the model. The model extracts the time-dependent internal resistance from (V,I)-data and local species concentration without any fitting parameters. RU resistances can be compared with the sum of the resistances of different components that allows one to make links between laboratory degradation experiments and the behavior of SOFC stacks during operation.

show abstract

“…The resistance included the grain resistance (R g ), intergrain resistance (R gb ), and the interface contact resistance between components of the composite electrode (R ct ) (Ref [24][25]. The corresponding ideal AC complex impedance plots (Cole-Cole half circle) and the equivalent circuit are shown in Fig.…”

Section: Ac Complex Impedance Analysesmentioning

confidence: 99%

Fabrication of Functionally Graded SOFC by APS

et al. 2007

View full text Add to dashboard Cite

Atmospheric plasma spray (APS) was used to prepare the planar positive/electrolyte/negative (PEN) and mono-block layer built (MOLB) type PEN solid oxide fuel cells (SOFCs). On the basis of the spraying conditions optimized previously and the self-developed functionally graded powder feeder system, two types of PEN cells were fabricated. Then the microstructure and material composition of the PEN cells were analyzed. The results show that graded layers formed between the electrodes and electrolyte. Moreover, the material composition and the porosity of the graded layers vary gradually. In particular, the porosities of the resultant anode and cathode reach 32.74 and 32.24%, respectively. Using the AC complex impedance technique, the conductivity of the MOLB type composite electrode is tested. The electrical conductivity of the MOLB type composite electrode with the graded layers is larger than that without the graded layers.

show abstract

AC impedance behavior of a practical-size single-cell SOFC under DC current

Cited by 27 publications

References 4 publications

Highly stable microtubular cells for portable solid oxide fuel cell applications

Highly stable microtubular cells for portable solid oxide fuel cell applications

A model-based approach for current voltage analyses to quantify degradation and fuel distribution in solid oxide fuel cell stacks

Fabrication of Functionally Graded SOFC by APS

Contact Info

Product

Resources

About