The Recent Progress of Oxygen Reduction Electrocatalysts Used at Fuel Cell Level

Area of Science:

• Electrochemistry
• Materials Science
• Energy Conversion

Background:

• Proton exchange membrane fuel cells (PEMFCs) offer higher energy density and efficiency than traditional cells.
• The oxygen reduction reaction (ORR) at the cathode is a major bottleneck for PEMFC development due to its inefficiency.
• Current research often overlooks ORR catalyst performance at the membrane electrode assembly (MEA) level, hindering real-world application assessment.

Purpose of the Study:

• To provide an overview of recent advancements in ORR catalysts.
• To emphasize the importance of evaluating ORR catalysts at the MEA level for PEMFCs.
• To offer insights into structure-activity relationships for designing efficient ORR catalysts for practical fuel cell conditions.

Main Methods:

• Literature review of ORR catalysts.
• Analysis of catalyst performance data specifically at the MEA level.
• Focus on structure-activity relationships relevant to PEMFCs.

Main Results:

• Identified key challenges in ORR catalyst efficiency for PEMFCs.
• Highlighted the limitations of rotating disk electrode (RDE) based evaluations.
• Emphasized the need for MEA-level testing to predict real-world performance.

Conclusions:

• Understanding catalyst behavior at the MEA level is essential for advancing PEMFC technology.
• Further research into structure-activity relationships is needed for novel ORR catalyst design.
• Developing affordable, highly-efficient ORR catalysts for MEA applications is critical for widespread PEMFC adoption.