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A Cleaner, Tunable Alternative for Hydrogen Fuel Cells and Water Electrolyzers Hydrogen energy systems depend on a small but critical polymer layer inside each electrode, called an ionomeric binder, that shuttles protons, manages water and lets reactant gases reach the catalyst. The industry has long relied on perfluorosulfonic acid (PFSA) materials for this role, which contain PFAS (per? and polyfluoroalkyl substances) — “forever chemicals” — now under increasing regulatory pressure. Researchers at Los Alamos National Laboratory have developed a family of highly sulfonated poly(norbornene) ionomers that are entirely PFAS-free, deliver strong proton conductivity, do not poison precious-metal catalysts the way conventional aromatic alternatives do, and can be chemically tuned to keep electrodes dry under load. Together, these qualities position the material as a drop-in path forward for high-performance proton exchange membrane (PEM) fuel cells and water electrolyzers in a tightening environmental landscape. How it Works PFAS-Free Sulfonated Poly(norbornene) Ionomeric Binders are a class of aliphatic sulfonated poly(norbornene) polymers designed specifically as electrode ionomers in proton-conducting devices. The polymer’s backbone is built from fused bicyclic norbornane units that lack the aromatic pi-electron systems found in conventional hydrocarbon ionomers. The absence of those electrons means the polymer does not strongly adsorb onto platinum catalyst surfaces, so cataly

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