Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell

Larisa Karpenko-Jereb, Pal Verebes, Victor Kovtunenko, Eduard-Emilian Schatt, Alexander Bergmann

Research output: Contribution to conferencePosterResearchpeer-review

Abstract

The work is devoted to development of a kinetic model describing the chemical degradation of the perfluorinated ionomer in the catalyst layers as well as in the membrane during the operation in a polymer electrolyte fuel cell.

The suggested model is based on the following approximations: a) hydrogen peroxide (H2O2) formation proceeds in both catalyst layers via the two-electron oxygen reduction (1); b) an amount of the hydrogen peroxide is reduced into water according to the reaction (2); c) the peroxide is transported via diffusion in the membrane, micro-porous and macro-porous layers; d) in ionomer, the peroxide reacts with metal cations via the Fenton reaction and (3) builds hydroxyl radicals; e) the hydroxyl radicals split the side chains of the ionomer, which contain the functional groups; f) the boundary conditions are identically to the conditions defined in [1].

(1) O2 + 2H+ + 2e-  H2O2 E2eORR = 0.695 V 2e oxygen reduction
(2) H2O2 + 2H+ + 2e-  2H2O EH2O2d = 1.760 V H2O2 reduction
(3) Fe2+ + H2O2 + H+  Fe3+ + OH. + H2O Fenton reaction

The model has been applied to analyze the effects of operating parameters such as pressure, temperature and relative humidity on the degradation of the perfluorinated ionomer in the operating fuel cell. The model enables to monitor time-dependent changes in the ionic conductivity of the membrane, the thickness of the membrane and the catalyst layer, acid group concentration of the ionomer as well as the amount of HF and CO2 released.

Acknowledgment. The work has been financially supported by the Austrian Research Promotion Agency (FFG), the Austrian Ministry for Transport, Innovation and Technology (BMVIT) and the company AVL List GmbH: Program “Mobilität der Zukunft”, Project “FC-DIAMOND” (No. 850328, 2015-2018) - PEM Fuel Cell DegradatIon Analysis and MinimizatiON MethoDology Based on Joint Experimental and Simulation Techniques.

[1] Wong K, Kjeang E. Macroscopic in-situ modeling of chemical membrane degradation in polymer electrolyte fuel cells // Journal of the Electrochemical Society 2014, 161 (9): F823-F832.
Original languageEnglish
Number of pages1
Publication statusPublished - 1 Aug 2017
EventInternational Congress on Membranes and Membrane Processes - Hotel Hilton, San Francisco , United States
Duration: 29 Jul 20174 Aug 2017
http://www.icom2017.org/home.html

Conference

ConferenceInternational Congress on Membranes and Membrane Processes
Abbreviated titleICOM2017
CountryUnited States
CitySan Francisco
Period29/07/174/08/17
Internet address

Fingerprint

Ionomers
Electrolytes
Fuel cells
Polymers
Membranes
Degradation
Peroxides
Hydroxyl Radical
Hydrogen Peroxide
Catalysts
Oxygen
Ionic conductivity
Functional groups
Macros
Cations
Atmospheric humidity
Innovation
Metals
Boundary conditions
Kinetics

Keywords

    Fields of Expertise

    • Sustainable Systems

    Cooperations

    • NAWI Graz

    Cite this

    Karpenko-Jereb, L., Verebes, P., Kovtunenko, V., Schatt, E-E., & Bergmann, A. (2017). Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell. Poster session presented at International Congress on Membranes and Membrane Processes, San Francisco , United States.

    Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell. / Karpenko-Jereb, Larisa; Verebes, Pal; Kovtunenko, Victor; Schatt, Eduard-Emilian; Bergmann, Alexander.

    2017. Poster session presented at International Congress on Membranes and Membrane Processes, San Francisco , United States.

    Research output: Contribution to conferencePosterResearchpeer-review

    Karpenko-Jereb, L, Verebes, P, Kovtunenko, V, Schatt, E-E & Bergmann, A 2017, 'Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell' International Congress on Membranes and Membrane Processes, San Francisco , United States, 29/07/17 - 4/08/17, .
    Karpenko-Jereb L, Verebes P, Kovtunenko V, Schatt E-E, Bergmann A. Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell. 2017. Poster session presented at International Congress on Membranes and Membrane Processes, San Francisco , United States.
    Karpenko-Jereb, Larisa ; Verebes, Pal ; Kovtunenko, Victor ; Schatt, Eduard-Emilian ; Bergmann, Alexander. / Modelling chemical degradation of ionomer in a polymer electrolyte fuel cell. Poster session presented at International Congress on Membranes and Membrane Processes, San Francisco , United States.1 p.
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    AU - Verebes, Pal

    AU - Kovtunenko, Victor

    AU - Schatt, Eduard-Emilian

    AU - Bergmann, Alexander

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    N2 - The work is devoted to development of a kinetic model describing the chemical degradation of the perfluorinated ionomer in the catalyst layers as well as in the membrane during the operation in a polymer electrolyte fuel cell. The suggested model is based on the following approximations: a) hydrogen peroxide (H2O2) formation proceeds in both catalyst layers via the two-electron oxygen reduction (1); b) an amount of the hydrogen peroxide is reduced into water according to the reaction (2); c) the peroxide is transported via diffusion in the membrane, micro-porous and macro-porous layers; d) in ionomer, the peroxide reacts with metal cations via the Fenton reaction and (3) builds hydroxyl radicals; e) the hydroxyl radicals split the side chains of the ionomer, which contain the functional groups; f) the boundary conditions are identically to the conditions defined in [1]. (1) O2 + 2H+ + 2e-  H2O2 E2eORR = 0.695 V 2e oxygen reduction (2) H2O2 + 2H+ + 2e-  2H2O EH2O2d = 1.760 V H2O2 reduction(3) Fe2+ + H2O2 + H+  Fe3+ + OH. + H2O Fenton reactionThe model has been applied to analyze the effects of operating parameters such as pressure, temperature and relative humidity on the degradation of the perfluorinated ionomer in the operating fuel cell. The model enables to monitor time-dependent changes in the ionic conductivity of the membrane, the thickness of the membrane and the catalyst layer, acid group concentration of the ionomer as well as the amount of HF and CO2 released. Acknowledgment. The work has been financially supported by the Austrian Research Promotion Agency (FFG), the Austrian Ministry for Transport, Innovation and Technology (BMVIT) and the company AVL List GmbH: Program “Mobilität der Zukunft”, Project “FC-DIAMOND” (No. 850328, 2015-2018) - PEM Fuel Cell DegradatIon Analysis and MinimizatiON MethoDology Based on Joint Experimental and Simulation Techniques. [1] Wong K, Kjeang E. Macroscopic in-situ modeling of chemical membrane degradation in polymer electrolyte fuel cells // Journal of the Electrochemical Society 2014, 161 (9): F823-F832.

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    KW - ionomer

    KW - chemical degradation

    KW - kinetics

    KW - polymer elcetrolyte fuel cell

    M3 - Poster

    ER -