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Transport in Proton Exchange Membranes for Fuel Cell Applications-A Systematic Non-Equilibrium Approach.

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Materials (Basel, Switzerland)
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Summary

Interface effects are crucial for accurately describing proton-exchange membranes in fuel cells. This study develops a model accounting for these interfaces, improving transport property analysis and optimization.

Keywords:
PEM fuel cellcoupling effectsdiffusivityelectro-osmotic draghydrogen permeabilityinterfacial effectsnon-equilibriumproton conductivitytransport coefficient matrixtransport propertieswater permeability

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Proton-exchange membranes (PEMs) are critical components in fuel cells.
  • Accurate characterization of PEM transport properties is essential for fuel cell performance.
  • Existing models often overlook the significant impact of interfacial effects.

Purpose of the Study:

  • To develop a thermodynamically consistent model for PEM transport properties.
  • To investigate the influence of interface effects on membrane behavior.
  • To provide a method for critical evaluation and optimization of PEM-based systems.

Main Methods:

  • Developed a thermodynamic model for transport properties of homogeneous membranes and membranes with surface layers.
  • Limited the model to four parameters per subsystem under isothermal conditions.
  • Analyzed existing experimental data from literature using the developed model.

Main Results:

  • The model provides well-defined parameters for homogeneous membrane properties.
  • Estimates for surface layer parameters were obtained, supporting the hypothesis.
  • Demonstrated the ability to critically evaluate literature values for PEM properties.

Conclusions:

  • Interface effects are indispensable for unambiguous description of PEM properties.
  • The developed model enables systematic optimization of stacked transport systems like fuel cells.
  • Accounting for interfacial layers, e.g., between catalyst and membrane, is vital for improved fuel cell design.