Effects of non‐planar interface and electrode parameters on the residual stress of solid oxide fuel cell. (29th September 2020)

• Record Type: Journal Article
• Authors: Li, Qiangqiang; Cao, Ganglin; Zhang, Xiongwen; Ma, Yanfei; Li, Guojun
• Is Part Of: International journal of energy research. Volume 45:Number 2(2021)
• Page Start: 2432
• Page End: 2444
• Publication Date: 2020-09-29
• Subjects: electrode parameters -- non‐planar interface -- residual stress -- solid oxide fuel cell -- thermal elastic model; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.5937
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The thermomechanical response of solid oxide fuel cell will endanger its structural reliability. In this study, the effects of non‐planar interface and electrode parameters are investigated by building a cosine anode‐electrolyte interface with amplitude A and wavelength λ . Results show that the planar interface model cannot completely reflect the stress state of solid oxide fuel cells. Non‐planar interface can stimulate high normal stress S n and shear stress S t at the interface, but these stresses are zero at the planar interface. Cosine interface causes approximately cosinoidal S n and sinusoidal S t . The bigger the ratio of amplitude to wavelength A / λ is, the more serious the S n fluctuates. Electrode parameter analysis shows that increasing initial porosity of oxidized anode can reduce the maximum S n but increases the maximum S t and the cell deflection. Parameter study show that initial porosity between 0.15 and 0.25 is suitable. The effect of anode thickness on the maximum S n and S t is weak, while the electrolyte thickness has a relatively strong effect when the electrolyte thickness is less than 12 μm. A NiO volume fraction between 0.52 to 0.58 is recommended to avoid overlarge S n, S t, and deflection. Abstract : A non‐planar anode‐electrolyte interface can cause nonzero normal stress S 22 and shear stress S 12 at the vicinity of the interface. The max tensile S 22 occurs at the peak of the convex interface, and the max S 12 occurs between the wave peak and the valley. A, the diagram of the non‐planar interface model. B, distribution of S 22 . C, distribution of S 12 .