Ionomeric Binders for High Temperature Proton Exchange Membrane Fuel Cells

Area of Science:

• Electrochemistry
• Materials Science
• Chemical Engineering

Background:

• High-temperature proton exchange membrane fuel cells (HT-PEMFCs) operate at 120-200°C, offering CO tolerance and simplified thermal/water management.
• A key challenge is low precious metal catalyst utilization due to phosphoric acid (PA) poisoning and inefficient three-phase boundaries.
• Binder materials in catalyst layers are crucial for HT-PEMFC performance but are under-researched.

Purpose of the Study:

• To review various binder materials used in HT-PEMFC catalyst layers.
• To analyze binders based on molecular structure and electrochemical properties.
• To elucidate the relationship between binder characteristics and fuel cell performance.

Main Methods:

• Literature review of existing studies on binder materials for HT-PEMFCs.
• Analysis of binder molecular structures and their impact on electrochemical properties.
• Correlation of binder gas permeability and conductivity with fuel cell performance metrics.

Main Results:

• Identified various binder types and their properties relevant to HT-PEMFC catalyst layers.
• Established links between binder characteristics (e.g., gas permeability, conductivity) and fuel cell performance.
• Highlighted the critical role of binders in overcoming PA poisoning and improving three-phase boundary efficiency.

Conclusions:

• Binder materials significantly influence catalyst utilization and overall performance in HT-PEMFCs.
• Understanding binder properties is essential for optimizing HT-PEMFC catalyst layer design.
• Further research into advanced binder materials is crucial for future HT-PEMFC development.