Thermal stress analysis of a planar anode-supported solid oxide fuel cell: Effects of anode porosity

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Thermal stress analysis of a planar anode-supported solid oxide fuel cell : Effects of anode porosity. / Zeng, Shumao; Xu, Min; Parbey, Jeo; Yu, Guangsen; Andersson, Martin; Li, Qiang; Li, Baihai; Li, Tingshuai.

I: International Journal of Hydrogen Energy, Vol. 42, Nr. 31, 08.2017, s. 20239-20248.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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Zeng, Shumao ; Xu, Min ; Parbey, Jeo ; Yu, Guangsen ; Andersson, Martin ; Li, Qiang ; Li, Baihai ; Li, Tingshuai. / Thermal stress analysis of a planar anode-supported solid oxide fuel cell : Effects of anode porosity. I: International Journal of Hydrogen Energy. 2017 ; Vol. 42, Nr. 31. s. 20239-20248.

RIS

TY - JOUR

T1 - Thermal stress analysis of a planar anode-supported solid oxide fuel cell

T2 - Effects of anode porosity

AU - Zeng, Shumao

AU - Xu, Min

AU - Parbey, Jeo

AU - Yu, Guangsen

AU - Andersson, Martin

AU - Li, Qiang

AU - Li, Baihai

AU - Li, Tingshuai

PY - 2017/8

Y1 - 2017/8

N2 - A Fuel cell is a highly efficient device for converting chemical energy in fuels to electrical energy and the electrical efficiency is strongly affected by the porosity in electrodes due to its close couplings with mass transfer and active sites for the electrochemical reactions, which will also cause changes in distribution of thermal stresses inside the electrodes. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is used to investigate the effects of porosity on polarizations, temperatures and thermal stresses by coupling equations for gas-phase species, heat, momentum, ion and electron transport. It was found that the porosity in the anode remarkably affected the exchange current density and electrical current density, but it had an opposite effect on the anodic activation polarization compared to that in cathode. The first principle stress was enhanced from 0 to 2 MPa to 6-8 MPa by an increased anode porosity from 25% to 40%, and the increased porosity resulted in a decrease of the von mises stress along the main flow direction as well. The conclusions could be used to lay foundations for an improved performance and stabilization by optimizing electrode microstructures and by eliminating the stresses in electrodes.

AB - A Fuel cell is a highly efficient device for converting chemical energy in fuels to electrical energy and the electrical efficiency is strongly affected by the porosity in electrodes due to its close couplings with mass transfer and active sites for the electrochemical reactions, which will also cause changes in distribution of thermal stresses inside the electrodes. A three-dimensional computational fluid dynamics (CFD) approach based on the finite element method (FEM) is used to investigate the effects of porosity on polarizations, temperatures and thermal stresses by coupling equations for gas-phase species, heat, momentum, ion and electron transport. It was found that the porosity in the anode remarkably affected the exchange current density and electrical current density, but it had an opposite effect on the anodic activation polarization compared to that in cathode. The first principle stress was enhanced from 0 to 2 MPa to 6-8 MPa by an increased anode porosity from 25% to 40%, and the increased porosity resulted in a decrease of the von mises stress along the main flow direction as well. The conclusions could be used to lay foundations for an improved performance and stabilization by optimizing electrode microstructures and by eliminating the stresses in electrodes.

KW - Current density

KW - Fuel cell

KW - Polarization

KW - Porosity

KW - Thermal stress

U2 - 10.1016/j.ijhydene.2017.05.189

DO - 10.1016/j.ijhydene.2017.05.189

M3 - Article

AN - SCOPUS:85021770825

VL - 42

SP - 20239

EP - 20248

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 1879-3487

IS - 31

ER -