An MEA (Membrane Electrode Assembly) is the functional heart of both PEM fuel cells and PEM electrolysers. It’s where the key electrochemical reactions occur. In simple terms, the MEA is a sandwich of:
- Proton exchange membrane – conducts protons while blocking electrons
- Catalyst layers – accelerate electrochemical reactions at both anode and cathode
- Gas diffusion layers – distribute reactants and remove products
Why MEAs Matter
Catalyst/membrane choices and contamination control are major drivers of performance and durability in both electrolysers and fuel cells. The quality and design of the MEA directly impacts:
- System efficiency
- Operational lifetime
- Gas purity and output quality
- Overall system reliability
Because the MEA governs efficiency, durability, and operating limits, it’s often the most critical component to understand when discussing PEM technology in general.
