Photocurable electrolyte based on sulfonated poly(ether ether ketone)

► Photocurable proton-conductive polymers were synthesized. ► Water uptake, ion exchange capacity, and proton conductivity were investigated. ► Membranes were water-resistant due to the interpenetrating polymer structures. ► Patterning of micro-structure on the photocured membrane was also demonstrated. ► The photoinitiator content contributed to the property of the photocured membrane.