Microphase-optimized sulfonated poly(biphenyl-piperidine-alkylene)- co -poly(biphenyl-trifluoroacetophenylene) proton exchange membranes with enhanced proton conductivity and oxidative stability for water electrolysis

Ether-free sulfonated poly(biphenyl-piperidine-hexylene)- co -poly(biphenyl-trifluoroacetophenone) membranes with flexible alkyl spacers show distinct phase separation, yielding high proton conductivity and oxidative stability for water electrolysis.