▎ 摘　　要

NOVELTY - Preparing dual-functional graphene loaded nickel-gold-palladium nano catalyst, comprises (i) preparing graphene oxide (GO) by hummer's method, diluting the GO with water to prepare GO aqueous solution with a concentration of 1-10 mg/ml; (ii) adding 3-aminopropyltriethoxysilane (APTS) and dipotassium hydrogen phosphate into the GO aqueous solution, and stirring for 10-20 minutes to obtain solution A; and (iii) adding nickel(II) chloride, chloroauric acid and sodium tetrachloropalladate aqueous solutions in sequence into solution A, continuously stirring for 1-10 minutes to obtain a mixed solution B; (iv) adding sodium borohydride as a reducing agent into the mixed solution B, stirring and reducing to obtain a mixed solution C and adding 15-150 mg sodium borohydride into every 15-25 ml solution B; and (v) reducing the mixed solution C by magnetic stirring in the air at room temperature, centrifuging when there are no bubbles and washing with water. USE - The nano catalyst is useful for producing hydrogen by catalyzing room temperature hydrolysis of formic acid. ADVANTAGE - The nano catalyst achieves complete decomposition of formic acid within 2 minutes, and has extremely high catalytic activity and 100% conversion rate and hydrogen selectivity. DETAILED DESCRIPTION - Preparing dual-functional graphene loaded nickel-gold-palladium nano catalyst, comprises (i) preparing graphene oxide (GO) using hummer's method, diluting the GO with water to prepare GO aqueous solution with a concentration of 1-10 mg/ml, and ultrasonically treating uniformly; (ii) adding 3-aminopropyltriethoxysilane (APTS) and dipotassium hydrogen phosphate into the GO aqueous solution, and stirring for 10-20 minutes to obtain solution A, where each 10-50 mg GO is added with 0.1-0.8 ml 3-aminopropyltriethoxysilane and 50-150 mg dipotassium hydrogen phosphate; and (iii) adding nickel(II) chloride, chloroauric acid and sodium tetrachloropalladate aqueous solutions in sequence into solution A, continuously stirring for 1-10 minutes to obtain a mixed solution B, where the molar ratio is nickel(II) chloride, chloroauric acid and sodium tetrachloropalladate is 1:1-3:1-8, the stated concentration is 0.01-1 M and each 15-25 ml solution B contains 0.02-0.1 mmol nickel(II) chloride; (iv) adding sodium borohydride as a reducing agent into the mixed solution B, stirring and reducing to obtain a mixed solution C and adding 15-150 mg sodium borohydride into every 15-25 ml solution B; and (v) reducing the mixed solution C by magnetic stirring in the air at room temperature, centrifuging when there are no bubbles and washing with water. INDEPENDENT CLAIMS are also included for: (1) use of dual-functional graphene-supported nickel-gold-palladium nano catalyst to catalyze room temperature hydrolysis of formic acid to produce hydrogen; and (2) method for catalyzing the hydrolysis of formic acid to produce hydrogen, comprising dispersing the obtained catalyst in water, adding formic acid aqueous solution at 25-50 degrees C and normal pressure to catalyze the hydrolysis of formic acid to produce hydrogen, where 0.1-1 mmol catalyst is added to every 5-15 ml water, the concentration of the formic acid aqueous solution is 0.1-5 M, and the molar ratio of the catalyst to formic acid is 0.01-0.5:1 and the molar amount of the catalyst is calculated as the sum of the molar amounts of the three elements nickel, gold and palladium.