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Area of Science:

  • Thermodynamics
  • Electrochemistry
  • Materials Science

Background:

  • High-temperature proton exchange membrane fuel cells (HT-PEMFC) necessitate auxiliary systems for stable operation.
  • Phosphoric acid-doped polybenzimidazole (PA-PBI) membranes are key materials in these systems.
  • Component interactions significantly impact overall HT-PEMFC system performance.

Purpose of the Study:

  • To develop a thermodynamic model for a vehicular HT-PEMFC system.
  • To analyze power distribution and exergy loss within the system.
  • To evaluate system performance using ecological functions and identify improvement potentials.

Main Methods:

  • Development of a thermodynamic model for a vehicular HT-PEMFC system.
  • Thermodynamic analysis to determine power distribution and exergy loss.
  • Parametric study on the effects of stack inlet temperature, pressure, and stoichiometry.

Main Results:

  • The stack and heat exchanger exhibit the highest exergy losses.
  • Maximum energy efficiency, exergy efficiency, and net output power occur at an inlet gas temperature of 406.1 K.
  • Optimal performance is achieved with low cathode inlet pressure and high anode inlet pressure.

Conclusions:

  • Reducing stoichiometry improves system output while ensuring adequate gas reaction.
  • System design should prioritize minimizing exergy loss in the stack and heat exchanger.
  • The developed model provides a framework for optimizing HT-PEMFC system design and operation.