A three dimensional multiphysics model of a solid oxide electrochemical cell: A tool for understanding degradation

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A three dimensional multiphysics model of a solid oxide electrochemical cell : A tool for understanding degradation. / Navasa, Maria; Graves, Christopher; Chatzichristodoulou, Christodoulos; Løye Skafte, Theis; Sundén, Bengt; Lund Frandsen, Henrik.

I: International Journal of Hydrogen Energy, Vol. 43, Nr. 27, 07.2018, s. 11913-11931.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Navasa, Maria ; Graves, Christopher ; Chatzichristodoulou, Christodoulos ; Løye Skafte, Theis ; Sundén, Bengt ; Lund Frandsen, Henrik. / A three dimensional multiphysics model of a solid oxide electrochemical cell : A tool for understanding degradation. I: International Journal of Hydrogen Energy. 2018 ; Vol. 43, Nr. 27. s. 11913-11931.

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TY - JOUR

T1 - A three dimensional multiphysics model of a solid oxide electrochemical cell

T2 - International Journal of Hydrogen Energy

AU - Navasa, Maria

AU - Graves, Christopher

AU - Chatzichristodoulou, Christodoulos

AU - Løye Skafte, Theis

AU - Sundén, Bengt

AU - Lund Frandsen, Henrik

PY - 2018/7

Y1 - 2018/7

N2 - Mitigating degradation is essential for extending the lifetime of solid oxide electrochemical cells (SOCs). The conditions leading to degradation, e.g. overpotentials, gas partial pressures, thermal gradients are hard, if not impossible, to retrieve experimentally. Thus, to deconvolute the response from cell testing, modeling can be applied to understand the degradation phenomena in greater detail. Modeling of SOCs is well developed. For computational efficiency, the electrodes are often represented with a mathematical abstraction of zero thickness layer. In this work, further attention is given to the local conditions in the through-thickness of the electrodes, by rigidly integrating classical electrochemistry into a three dimensional multiphysics model of an SOC. Hereby, local conditions (e.g. overpotential) vary through the electrode, and with the coupling to the different transport phenomena occurring (mass, current, momentum and species), this becomes available in three dimensions, throughout a cell. To investigate the validity of the model, a high number of experiments are conducted at different operating conditions, i.e. in both fuel cell and electrolysis mode of operation with H2/H2O as feedstock varying parameters such as temperature, gas flows and gas compositions.

AB - Mitigating degradation is essential for extending the lifetime of solid oxide electrochemical cells (SOCs). The conditions leading to degradation, e.g. overpotentials, gas partial pressures, thermal gradients are hard, if not impossible, to retrieve experimentally. Thus, to deconvolute the response from cell testing, modeling can be applied to understand the degradation phenomena in greater detail. Modeling of SOCs is well developed. For computational efficiency, the electrodes are often represented with a mathematical abstraction of zero thickness layer. In this work, further attention is given to the local conditions in the through-thickness of the electrodes, by rigidly integrating classical electrochemistry into a three dimensional multiphysics model of an SOC. Hereby, local conditions (e.g. overpotential) vary through the electrode, and with the coupling to the different transport phenomena occurring (mass, current, momentum and species), this becomes available in three dimensions, throughout a cell. To investigate the validity of the model, a high number of experiments are conducted at different operating conditions, i.e. in both fuel cell and electrolysis mode of operation with H2/H2O as feedstock varying parameters such as temperature, gas flows and gas compositions.

KW - Degradation

KW - Modeling

KW - Potential profiles

KW - Solid oxide electrochemical cells

KW - Transport phenomena

UR - http://www.scopus.com/inward/record.url?scp=85047218151&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2018.04.164

DO - 10.1016/j.ijhydene.2018.04.164

M3 - Article

VL - 43

SP - 11913

EP - 11931

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 1879-3487

IS - 27

ER -