▎ 摘　　要

NOVELTY - The electrode has an electrolyte film (11a) contacting a catalyst layer (1). The catalyst layer has carbon nanowalls (3) each including a rectangular graphene sheet (31) positioned along the perpendicular direction with respect to the electrolyte film. An ionic conduction layer (6) is positioned on the surface of each graphene sheet. USE - Electrode for membrane electrode assembly of fuel cell (both claimed) for use as power supply in electric vehicle, and as power supply for outer installation. ADVANTAGE - The electrode has simple structure. The electrical conduction path from the catalyst layer to the electrolyte film is reduced, and so the electrochemical reaction is performed efficiently, and electric power generation efficiency is improved. The catalyst usage amount is reduced. DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the membrane electrode assembly. Catalyst layer (1) Carbon nanowalls (3) Ionic conduction layer (6) Electrolyte film (11a) Graphene sheet (31)