A flexible portable proton exchange membrane fuel cell

► A flexible portable proton exchange membrane fuel cell (PEMFC) has been developed. ► Its non-directional flexibility is acquired with carbon fibre current collectors. ► It performs well when bent to curvatures with various radii in any directions. ► Current collector is composed of several metal wire embedded carbon fibre bunches. ► Flexible carbon fibre has low contact resistance under very low compression force.