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Effects of non‐planar interface and electrode parameters on the residual stress of solid oxide fuel cell
Author(s) -
Li Qiangqiang,
Cao Ganglin,
Zhang Xiongwen,
Ma Yanfei,
Li Guojun
Publication year - 2021
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.5937
Subject(s) - materials science , anode , solid oxide fuel cell , electrolyte , oxide , planar , composite material , half cell , electrode , stress (linguistics) , deflection (physics) , porosity , amplitude , optics , chemistry , metallurgy , working electrode , linguistics , computer graphics (images) , philosophy , computer science , physics
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.