▎ 摘　　要

NOVELTY - Noble metal-manganese oxide composite catalyst for a positive electrode of an aqueous rechargeable battery that regenerates a solvent of an aqueous electrolyte. USE - Noble metal-manganese oxide composite catalyst for a positive electrode of an aqueous rechargeable battery that can regenerate a solvent of an aqueous electrolyte. ADVANTAGE - The aqueous rechargeable battery systems employing aqueous electrolytes, such as electrolyte depletion caused by solvent decomposition and increased internal pressure of the batteries caused by gas generation. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing a noble metal-manganese oxide composite catalyst for a positive electrode of an aqueous rechargeable battery, involves (1) dissolving a manganese precursor in distilled water to prepare an aqueous manganese precursor solution, (2) adding a permanganate to the aqueous manganese precursor solution to prepare a manganese precursor/permanganate mixed solution, (3) subjecting the manganese precursor/permanganate mixed solution to hydrothermal synthesis at a temperature of 150 to 250 ℃, (4) washing and drying the product of the hydrothermal synthesis to obtain a manganese oxide, and (5) mixing the manganese oxide with a noble metal supported on a carbon-based support.