▎ 摘　　要

NOVELTY - Preparing platinum-rhodium alloy comprises reacting the raw material solution containing polyvinylpyrrolidone, water-soluble iodized salt, N,N-dimethylformamide, polyol, platinum source and rhodium source at 130-160degreesC; taking the solid phase after reaction; the volume ratio of the polyol and N,N-dimethylformamide is (2-4): 1; the molar ratio of the platinum source and the rhodium source is (1-10): 1; the molar ratio of the total moles of the platinum source and the rhodium source to the iodine ion is 1: (10-20); the molar ratio of the total moles of the platinum source and the rhodium source to the polyvinylpyrrolidone is 1: (20-50); the total concentration of the platinum source and the rhodium source is 2-5 mmol/L. USE - The platinum-rhodium alloy is useful in platinum-rhodium alloy composite material used as catalyst in cathode oxygen reduction reaction of proton exchange membrane fuel cell. ADVANTAGE - The platinum-rhodium alloy: open foot structure has high specific surface area; and has high activity and durability. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) Platinum-rhodium alloy, is prepared by above mentioned method. (2) Platinum-rhodium alloy composite material comprising a carrier and platinum-rhodium alloy supported on carrier.