The effect of anode microstructure and fuel utilization on current relaxation and concentration polarization of solid oxide fuel cell under electrical load change

Bae, Yonggyun; Lee, Sanghyeok; Hong, Jongsup

doi:10.1016/j.enconman.2019.112152

Cited by 23 publications

(11 citation statements)

References 46 publications

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“…Additional to CV curves experimental evaluation of gas composition [79] or temperature [83] at multiple locations along the channel provides further information on the validity of the model. This is also the case for temporally resolved measurements of current density for transient models as presented for a 3D RPU in [248,249].…”

Section: Parametrization and Validationmentioning

confidence: 86%

Section: Transient Behaviormentioning

confidence: 99%

“…Several studies focus on the cell or stack response to rapid changes in the applied current [49,56,80,183,[247][248][249][250]. Here [248,249] are to highlight as they include both a high spatial and temporal resolution in a 3D channel RPU. To achieve this, only mass and heat transport are resolved in a time-dependent way and a quasi-stationary state for electrochemistry is assumed.…”

Section: Transient Behaviormentioning

confidence: 99%

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High Temperature Solid Oxide Electrolysis – Technology and Modeling

Mueller,

Klinsmann,

Sauter

et al. 2023

Chemie Ingenieur Technik

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In the global quest to renounce from fossil fuels, a large demand for the renewable production of hydrogen via water electrolysis exists. In this context, the solid oxide electrolyzer (SOE) is an interesting technology due to its high efficiency resulting from elevated operating temperatures of up to 900 °C. Physical modeling plays a vital role in the development of SOEs, as it lowers experimental costs and provides insight where measurements reach limits. A main challenge for modeling SOEs is the multitude of physical effects, occurring and interacting on various spatial and temporal scales. This requires assumptions and simplifications, particularly when increasing scope and dimensions of a model. In this review, we discuss the different approaches currently available in literature.

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Section: Parametrization and Validationmentioning

confidence: 86%

Section: Transient Behaviormentioning

confidence: 99%

Section: Transient Behaviormentioning

confidence: 99%

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High Temperature Solid Oxide Electrolysis – Technology and Modeling

Mueller,

Klinsmann,

Sauter

et al. 2023

Chemie Ingenieur Technik

View full text Add to dashboard Cite

show abstract

“…4 Therefore, the three-dimensional (3D) multiphysics modeling and numerical simulation play a critical role in understanding fundamentals inside a SOFC. 5 However, most SOFC modeling works reported in the literature mainly focus on analyzing electrochemistry and transport inside a cell or stack, [6][7][8] yet the thermal stress, deformation, and mechanical degradation were far less considered in the numerical simulation. 9 A complete SOFC operating duty cycle reflects the thermal history and mechanical constraints applied to a cell or stack from fabrication to operation, which mainly includes the manufacturing stage, heating-up stage, reduction stage, operation stage, and shut down stage.…”

Section: List Of Symbolsmentioning

confidence: 99%

Thermo-Electro-Chemo-Mechanical Modeling of Solid Oxide Fuel Cell for Stress and Failure Evolution during Duty Cycle

Wu¹,

Xu²,

Yan³

et al. 2021

J. Electrochem. Soc.

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A comprehensive three-dimensional model for an assembled button solid oxide fuel cell is developed by coupling thermal-electrochemical and mechanical models. Different mechanical effects including residual strain, thermal strain, accelerated and normal creep, mechanical properties change of anode, as well as chemical expansion are considered. The mechanical response of the button cell subjected to an idealized duty cycle from the as-fabricated state, heating-up stage, reduction stage, to three operation periods of 800 °C, 700 °C, and 600 °C is numerically simulated. Simulations are based on and validated by the experimental polarization curves and residual stress curve. Results show that the sealant is susceptible to fracture at the as-fabricated state, while the cathode is likely to fail during heating-up stage. The accelerated creep effect during reduction significantly eliminates the tensile stress in the anode nevertheless leads to higher stress in the cathode and electrolyte. It indicates that the assumption of zero-stress temperature at the reduction point could cause an underestimation of stress in the cathode and electrolyte in the case of a constrained cell. The chemical expansion effect in the cathode is more prominent at higher operating temperatures. A minimum failure probability of the cell is found at 700 °C with consideration of chemical expansion.

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“…[57][58][59][60][61] While there are models addressing the electrochemical simulation of an entire cell including gas supply channels, these studies have all been for conventional composite electrode cells and have focused on the distribution of gaseous species, 62-64 temperature 65,66 and overpotentials 67,68 along the cell length and thickness. Only a few papers have addressed how different electrode microstructural properties scale up and affect the performance of the entire cell, [69][70][71][72][73][74] but again only for cells with conventional composite electrodes. In particular, there are no systematic studies addressing in depth how different electrode architectures, more specifically conventional and infiltrated electrode microstructures, affect the microstructural properties and, in turn, the electrochemical performance at both electrode and cell levels.…”

Section: List Of Symbolsmentioning

confidence: 99%

Structure—Properties—Performance: Modelling a Solid Oxide Fuel Cell with Infiltrated Electrodes

Shekhar

Bertei

Monder

2020

J. Electrochem. Soc.

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The microstructure of a solid oxide fuel cell (SOFC) electrode has a direct impact on its transport and kinetic properties, which in turn control electrode and cell performance. This study presents models and simulations for SOFC performance that use previously published models to describe the connection between electrode microstructure and key properties such as effective conductivity, three phase boundary density, effective diffusivity, and permeability. These effective properties are then used in a multiphysics model that solves the coupled set of differential equations that describe the working of a SOFC for a given set of operating conditions and model parameters. The results presented strongly suggest that using infiltrated electrodes for both the air and fuel electrodes, instead of conventional composite sintered-powder based electrodes, leads to substantially higher performance as measured by high current density at high cell potentials and high fuel utilization. The cell performance curves are supplemented with sensitivity and parametric analyses to examine the impact of varying experimentally controllable electrode microstructural parameters on cell performance.

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The effect of anode microstructure and fuel utilization on current relaxation and concentration polarization of solid oxide fuel cell under electrical load change

Cited by 23 publications

References 46 publications

High Temperature Solid Oxide Electrolysis – Technology and Modeling

High Temperature Solid Oxide Electrolysis – Technology and Modeling

Thermo-Electro-Chemo-Mechanical Modeling of Solid Oxide Fuel Cell for Stress and Failure Evolution during Duty Cycle

Structure—Properties—Performance: Modelling a Solid Oxide Fuel Cell with Infiltrated Electrodes

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