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One of the most common and commercially available PEM membrane is Chemours’s Nafion™ membranes. These membranes are proton-conductive polymer film, also known as electrolyte or ionomer, that allow only protons to cross-over (cation exchange membrane), the key function of Nafion™ proton exchange membrane fuel cells and water electrolyzers.
Nafion™ is widely used for PEM fuel cells and can be identified based on the variety of thickness and specific application. Nafion™ 117, Nafion™ 115, Nafion™ 212, Nafion™ 211 membranes are non-reinforced films, and last numbers apply to their various thickness dimensions. Choosing the proper thickness depends primarily on the differential pressure you expect across the membrane (i.e. what pressure you will be generating the hydrogen at vs. the oxygen), the type of support the membrane will have, and the operating lifetime (both hours and on/off cycles).
When the best efficiency is required and there won't be much differential pressure across the membrane. We have made membranes using Nafion™ 212 (0.002" thick), Nafion™ 211 (0.001") and Nafion™ XL (~0.001"; chemically reinforced) that have all been shown to be exceptionally efficient.
Thicker membranes and fiber reinforced membranes are more appropriate for very high differential pressure applications (1000+ psi) or very long operating life (100,000+ hrs).
Some of these factors can also be mitigated with good mechanical design of the electrolyzer cell, good catalyst configurations, etc.