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Research Papers

Stability Issues of Fuel Cell Models in the Activation and Concentration Regimes

[+] Author and Article Information
S. B. Beale

Fellow ASME
Forschungszentrum Jülich GmbH,
Institute of Energy and Climate Research, IEK-3,
Jülich 52425, Germany;
Mechanical and Materials Engineering,
Queen's University,
Kingston, ON K7 L 3N6, Canada
e-mails: s.beale@fz-juelich.de;
steven.beale@queensu.ca

U. Reimer

Forschungszentrum Jülich GmbH,
Institute of Energy and Climate Research, IEK-3,
Jülich 52425, Germany
e-mail: u.reimer@fz-juelich.de

D. Froning

Forschungszentrum Jülich GmbH,
Institute of Energy and Climate Research, IEK-3,
Jülich 52425, Germany
e-mail: d.froning@fz-juelich.de

H. Jasak

Mechanical Engineering and Naval Architecture,
University of Zagreb,
Ivana Lucica 5,
Zagreb 10000, Croatia;
Wikki Ltd.,
Unit 459, Southbank House, Black Prince Road,
London SE1 7SJ, UK
e-mails: hrvoje.jasak@fsb.hr;
h.jasak@wikki.co.uk

M. Andersson

Department of Energy Sciences,
Lund University,
Lund 22100, Sweden;
Forschungszentrum Jülich GmbH,
Institute of Energy and Climate Research, IEK-3,
Jülich 52425, Germany
e-mail: martin.andersson@energy.lth.se

J. G. Pharoah

Mechanical and Materials Engineering,
Queen's University,
Kingston, ON K7 L 3N6, Canada
e-mail: pharoah@queensu.ca

W. Lehnert

Forschungszentrum Jülich GmbH,
Institute of Energy and Climate Research, IEK-3,
Jülich 52425, Germany;
Modeling in Electrochemical Process
Engineering,
RWTH Aachen University,
Aachen 52056, Germany;
JARA-HPC,
Jülich 52425, Germany
e-mail: w.lehnert@fz-juelich.de

1Corresponding author.

Manuscript received June 14, 2017; final manuscript received March 26, 2018; published online May 7, 2018. Assoc. Editor: Jacob R. Bowen.

J. Electrochem. En. Conv. Stor. 15(4), 041008 (May 07, 2018) (7 pages) Paper No: JEECS-17-1070; doi: 10.1115/1.4039858 History: Received June 14, 2017; Revised March 26, 2018

Code stability is a matter of concern for three-dimensional (3D) fuel cell models operating both at high current density and at high cell voltage. An idealized mathematical model of a fuel cell should converge for all potentiostatic or galvanostatic boundary conditions ranging from open circuit to closed circuit. Many fail to do so, due to (i) fuel or oxygen starvation causing divergence as local partial pressures and mass fractions of fuel or oxidant fall to near zero and (ii) nonlinearities in the Nernst and Butler–Volmer equations near open-circuit conditions. This paper describes in detail, specific numerical methods used to improve the stability of a previously existing fuel cell performance calculation procedure, at both low and high current densities. Four specific techniques are identified. A straight channel operating as a (i) solid oxide and (ii) polymer electrolyte membrane fuel cell is used to illustrate the efficacy of the modifications.

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References

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Figures

Grahic Jump Location
Fig. 1

Schematic of “quickTest” problem [7]. Properties and boundary values are given in Tables 1 and 2.

Grahic Jump Location
Fig. 2

Polarization curve for SOFC showing a comparison between the original [7] and the present results

Grahic Jump Location
Fig. 3

Typical calculated species distribution in an SOFC cathode

Grahic Jump Location
Fig. 4

Nernst potential versus activity for a PEFC operating with pure hydrogen and oxygen

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Fig. 5

Polarization curve for PEFC example

Tables

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