SEARCH Articles Figures Tables Acidic fuel cell Acidic protons, exchange Acidity exchange Acids protonic Exchange membrane cells Exchangeable acidity Fuel cell membrane Fuel cell proton exchange Fuel cells exchange membrane Fuel cells proton exchange membrane Perfluorosulfonates Perfluorosulfonic membranes Proton acids Proton exchange Proton exchange membran Proton exchange membrane cells Proton fuel cell