Investigation of the bonding strength and bonding mechanisms of SOFCs interconnector–electrode interfaces

Boccaccini, Dino Norberto; Ševeček, Oldřich; Frandsen, Henrik Lund; Dlouhý, Ivo; Molin, Sebastian; Cannio, Maria; Hjelm, Johan; Hendriksen, Peter Vang

doi:10.1016/j.matlet.2015.07.137

Cited by 16 publications

(11 citation statements)

References 4 publications

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“…In addition to electrically limited lifetime, another requirement to the interconnect is given by mechanical properties of the steel/oxide/coating structure [72,73]. Due to differences in thermal expansion coeficient of different layers, thermal stresses will arise during heating and cooling, and when some critical thickness is reached, it will lead to cracking or delamination of the scale.…”

Section: Post Mortem Analysismentioning

confidence: 99%

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Molin

Jasiński

Mikkelsen

et al. 2016

Journal of Power Sources

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Section: Post Mortem Analysismentioning

confidence: 99%

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Molin

Jasiński

Mikkelsen

et al. 2016

Journal of Power Sources

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“…With the addition of layers (SOC1‐SOC3), the CTE mismatch gives rise to residual stresses that are responsible, together with nonsymmetric design, for discrepancies in the deflections according to the tested side (i.e., which outer layer is in tension or compression). Poisson's ratios used for the layers were taken from literature and are summarized in Table , together with thicknesses and densities of individual layers.…”

Section: Methodsmentioning

confidence: 99%

Elastic properties of multi‐layered ceramic systems for SOCs

Masini

Siska

Ševeček

et al. 2017

Int J Applied Ceramic Tech

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SOCs (Solid Oxide Cells) operate in harsh conditions and have to withstand considerable static and cyclic stresses, both mechanical and thermal. Thus, their mechanical stability is threatened. One fundamental aspect is the structural integrity of the cell. In fact, mechanical failure of a single cell can damage the whole stack, reducing the lifetime and the efficiency of the entire system. This study focuses on the ceramic layered structure of an Yttria-stabilized electrolyte supported cell. Its elastic modulus has been measured through destructive and nondestructive techniques (three-point bending test, impulse excitation technique, tensile test). Many literature sources deal with properties of the most common electrolytes and electrodes, yet co-sintering effects and interactions between layers are still not fully comprehended. In this contribution the overall elastic performance of the cell has been investigated, focusing on the role that the interface between layers plays in the changing of resulting mechanical properties. To enable this investigation, layers were added to the electrolyte one by one, thus allowing individual interactions to be distinguished with the help of numerical simulations. Results obtained for consecutive samples through different techniques have been compared and discussed. K E Y W O R D S elastic constants, finite element analysis, fuel cells, layered ceramics

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“…During the last two decades, the attention to SOFC has been drawn and the number of the experimental and numerical research papers has been increased considerably. [4][5][6][7][8][9][10] Unfortunately, the high-temperature operation of SOFCs has several drawbacks such as limited material selection, accelerated morphological and chemical degradation, and enhanced diffusion of components and impurities between adjacent layers and on the surface. Most researchers nowadays focus on the thermal stress inside the SOFC, [11][12][13][14] They studied the delamination and degradation of SOFCs electrode/electrolyte estimated by calculating the stresses generated within the different layers of the cell.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of detecting crack initiation in a planar solid oxide fuel cell

Fahs

Ghassemi

Fahs

2020

Env Prog and Sustain Energy

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Converting chemical energy into electricity is done by an electrochemical device known as a fuel cell. Thermal stress is caused by high operating temperature, between 700 and 1,000 C, of solid oxide fuel cell (SOFC). Thermal stress is the main cause of crack initiation and crack propagation. This phenomenon may cause gas leakage, structure instability and cease operation of the SOFC before its lifetime. The aim of this study is to present a method that predicts the initiation of cracks in an anisotropic porous planar SOFC. The coupled governing nonlinear differential equations are solved numerically as for heat transfer, fluid flow, mass transfer, mass continuity, and momentum. An in-house computer code which is based on computational fluid dynamics, computational structural mechanics and extended finite element method is utilized and developed. This code, according to Darcy and Navier-Stokes thermofluid model, determines the temperature and stress distribution. The results show that the highest thermal stress occurs at the upper corners of cathode and at the lower corners of the anode. The maximum temperature occurs at the middle of the electrolyte cathode and electrolyte anode, while the maximum pressure occurs at the middle of the upper and lower section of the anode and cathode. In addition, the thickness of the cathode electrode at the left side is increased by 1.5%. Finally, the crack initiation occurs at the left side between the upper and lower corners of the cathode.

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Investigation of the bonding strength and bonding mechanisms of SOFCs interconnector–electrode interfaces

Cited by 16 publications

References 4 publications

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

Elastic properties of multi‐layered ceramic systems for SOCs

Numerical study of detecting crack initiation in a planar solid oxide fuel cell

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