Reducing oxygen transport resistance within catalyst layer for fuel cells by adopting intrinsically microporous ionomer

Herein, a sulfonated ionomer with intrinsic microporosity was designed as a catalyst binder in a low-Pt-loaded fuel cell to construct a good triple-phase boundary, achieving an obvious 57% reduction of local oxygen-transport resistance and a notable 47% increase in peak power density of up to 1233 mW cm-2.