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Proton exchange membrane fuel cells (PEMFCs) have been successfully demonstrated as a technology for purifying helium (He) by electrochemically separating hydrogen (H2) from a mixed gas stream where H2 was considered a contaminant. Used in this capacity, PEMFCs are more energetically efficient, clean, and potentially cost effective than other separation methods such as cryogenic distillation. One specific application for this technology is to purify He gas that was used to purge cryogenic H2 storage tanks and gaseous boil-off in fuel lines for rocket engines that utilize liquid H2 as the fuel. Separation of He and H2 using PEMFCs is beneficial to organizations such as the National Aeronautic and Space Administration (NASA) that require liquid H2 fueled engines.

A Study of the Durability and Performance of a Proton Exchange Membrane Electrode Assembly Used in the Separation of Hydrogen From Helium