Improvement of electrochemical performance in alkaline fuel cell by hydroxide ion conducting Ni-Al layered double hydroxide

► Layered double hydroxides (LDHs) were used as ionomer of an alkaline fuel cell. ► Ni-Al and Mg-Al LDH intercalated with CO32− were added to the catalyst layer. ► The catalyst layer with LDHs showed better performance than that without LDHs. ► OH− conductive LDHs contribute to constructing more favorable triple phase boundary regions.