Chemours says it will spend $200 million to increase capacity and advance the technology of its Nafion ion-exchange materials to support the hydrogen economy. The fluoropolymer materials touch hydrogen use for energy in a few ways. Nafion membranes are used in water electrolyzers to make hydrogen and in hydrogen-consuming fuel cells. The materials are also found in flow batteries. Chemours says it is considering facilities in the US and Europe for the expansion and isn’t disclosing project timing.