The membrane is the heart of every electrolyzer, fuel cell, and redox flow stack — it sets ionic conductivity, gas crossover, and the operating pH window all at once. This collection groups the ion-exchange membranes and pre-fabricated MEA / CCM assemblies we stock for PEM, AEM, alkaline, redox-flow, and electrodialysis work, so you can match polymer chemistry and reinforcement to the cell you are actually building.
Cation-exchange membranes (CEMs)
Proton-conducting PFSA ionomers (the family generically known as Nafion-type sulfonated PFSAs) dominate acidic PEM fuel cells, PEM water electrolyzers, and vanadium redox flow batteries. We carry both non-reinforced PFSA films for benchtop screening and ePTFE-reinforced grades that allow much thinner membranes without losing mechanical strength. Hydrocarbon CEMs based on sulfonated polystyrene-DVB resins are listed alongside as a cost-efficient option for electrodialysis and electrodeionization, where chemical robustness matters more than ultra-low ohmic resistance.
Anion-exchange membranes (AEMs)
Quaternary-ammonium-functionalized hydrocarbon AEMs are stocked in two flavors: polyaromatic backbones tuned for alkaline electrolysis, AEM fuel cells, and CO2 reduction; and a separate series optimized for electrodialysis and water desalination in neutral to mildly alkaline streams. Reinforced and non-reinforced grades let you trade lowest possible area-specific resistance against dimensional stability under wet/dry cycling. Ether-free QAPPT-type backbones are available where long-term hydroxide stability is the priority.
Bipolar membranes
Bipolar membranes laminate a cation-exchange layer and an anion-exchange layer with a catalytic water-dissociation interface, generating H+ and OH- in situ. PEEK-reinforced grades resist delamination under industrial pressures and are the working choice for acid/base recovery, electrodialysis, and emerging CO2-to-formate electrolyzers.
MEAs and catalyst-coated membranes
Pre-built MEAs and CCMs ship ready to drop into a single cell. PEM water-electrolyzer CCMs use IrO2 on the anode for OER stability in acidic, oxidative conditions and Pt/C on the cathode for HER. AEM water-electrolyzer MEAs pair PGM-free or low-PGM catalysts with an anion-exchange membrane for alkaline operation.
If you are building a PEM fuel cell or PEMWE, start with the PFSA CEM and CCM listings; for alkaline electrolyzers and AEMFCs, see the AEM grades; for redox flow batteries, see the reinforced thin CEMs; for acid/base regeneration, see the bipolar membranes.
