What Is a Proton Exchange Membrane Fuel Cell? Proton exchange membrane fuel cells, also known as polymer electrolyte fuel cells, are low-temperature fuel cells that typically operate below 100°C. To compare PEMFCs with AFC, MCFC, SOFC, and DMFC systems, see this fuel cell classification guide. This makes them suitable for a wide range of PEM … Continue reading Proton Exchange Membrane Fuel Cell Structure & Key Components