Finite Time Thermodynamic Modeling and Performance Analysis of High-Temperature Proton Exchange Membrane Fuel Cells

Area of Science:

• Energy Science
• Thermodynamics
• Electrochemistry

Background:

• High-temperature proton exchange membrane fuel cells (HT-PEMFCs) are crucial for clean energy generation.
• Optimizing HT-PEMFC performance is essential for their widespread adoption.
• Existing models may not fully capture the complex thermodynamic behaviors under various operating conditions.

Purpose of the Study:

• To establish a finite time thermodynamic (FTT) model for HT-PEMFCs.
• To analyze the energetic, exergetic, and ecological performance of HT-PEMFCs.
• To identify key parameters influencing HT-PEMFC output performance.

Main Methods:

• Development of an FTT model for HT-PEMFC.
• Derivation of thermodynamic performance indexes: power density, thermodynamic efficiency, exergy efficiency, exergetic performance coefficient (EPC), entropy production rate, and ecological coefficient of performance (ECOP).
• Simulation and analysis of HT-PEMFC performance under varying operating temperature, doping level, membrane thickness, operating pressure, and relative humidity.

Main Results:

• Operating temperature, membrane doping level, and membrane thickness significantly impact HT-PEMFC performance.
• Power density increased by 58% (temperature), 31.1% (doping level), and 44.9% (membrane thickness).
• Optimal output performance was observed at a doping level of 8; operating pressure and relative humidity showed minor effects.

Conclusions:

• The FTT model provides valuable insights into HT-PEMFC performance optimization.
• Strategic adjustments to operating temperature, doping level, and membrane thickness can substantially improve power density.
• Further research can leverage these findings for more efficient fuel cell design and operation.