▎ 摘　　要

NOVELTY - A multifunctional radical scavenger comprises a radical scavenger (S1), and a functional nanosheet layer comprising at least two or more layers comprising functional nanosheet, coated on the surface of radical scavenger (S1). USE - Multifunctional radical scavenger is used for polymer electrolyte membrane and catalyst layer for membrane-electrode assembly of fuel cell (all claimed). ADVANTAGE - The multifunctional radical scavenger improves both chemical durability and heat dissipation performance of the membrane-electrode assembly by forming a protective layer in which two or more functional nanosheet layers are combined, thus extending the life and performance of the fuel cell. DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of the membrane-electrode assembly. 20Anode electrode 30Catalyst layer 40Electrode substrate 50Polymer electrolyte membrane 100Membrane-electrode assembly