ANTIOXIDANT FOR FUEL CELLS, MEMBRANE ELECTRODE ASSEMBLY INCLUDING THE SAME AND METHOD FOR PREPARING ANTIOXIDANT

Disclosed are an antioxidant for fuel cells, a membrane electrode assembly including the same and a method for preparing the antioxidant. The antioxidant for fuel cells includes a core including at least one selected from the group consisting of a metal oxide (MO) and a complex metal oxide (MNO, N and M being different metals), and an outer portion (e.g., a shell) located on or over a surface of the core and formed by performing reduction treatment of the surface of the core using a thiourea-based compound. The outer portion includes metal cations (M, n being a natural number of or more) having a smaller oxidation number than a valency of the metal (M) of the core.