▎ 摘　　要

NOVELTY - Unidirectional water permeable Janus carbon paper comprises a super-hydrophilic layer, a catalyst layer, a gas diffusion layer and a hydrophobic layer. The super hydrophilic layers are carbon paper. The catalyst layer is carbon particles. The gas diffusion layers are graphene balls and nano carbon balls. The hydrophobic layer is polytetrafluoroethylene. USE - The unidirectional water permeable Janus carbon paper is used for preparing functional carbon paper in automobiles and portable electronic devices. ADVANTAGE - The unidirectional water permeable Janus carbon paper is environmentally-friendly and has low production cost, high air permeability and strong water resistance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a preparation method of the unidirectional water permeable Janus carbon paper.