Mathematical Modeling of Cation Contamination in a Proton-exchange Membrane

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Transport phenomena in an ion-exchange membrane containing both H+ and K+ are described using multicomponent diffusion equations (Stefan-Maxwell). A model is developed for transport through a Nafion 112 membrane in a hydrogen-pump setup. The model results are analyzed to quantify the impact of cation contamination on cell potential. It is shown that limiting current densities can result due to a decrease in proton concentration caused by the build-up of contaminant ions. An average cation concentration of 30 to 40 percent is required for appreciable effects to be noticed under typical steady-state operating conditions.

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Weber, Adam & Delacourt, Charles September 11, 2008.

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Transport phenomena in an ion-exchange membrane containing both H+ and K+ are described using multicomponent diffusion equations (Stefan-Maxwell). A model is developed for transport through a Nafion 112 membrane in a hydrogen-pump setup. The model results are analyzed to quantify the impact of cation contamination on cell potential. It is shown that limiting current densities can result due to a decrease in proton concentration caused by the build-up of contaminant ions. An average cation concentration of 30 to 40 percent is required for appreciable effects to be noticed under typical steady-state operating conditions.

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21

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  • Journal Name: Fuel Cells

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  • Report No.: LBNL-1055E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 946733
  • Archival Resource Key: ark:/67531/metadc893802

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  • September 11, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Jan. 4, 2017, 5:52 p.m.

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Weber, Adam & Delacourt, Charles. Mathematical Modeling of Cation Contamination in a Proton-exchange Membrane, article, September 11, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc893802/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.