▎ 摘　　要

NOVELTY - The preparation method of nano-catalyst involves dispersing graphene oxide in 30 ml deionized water and then mixing, adding urea to the mixture and then reacting, adding nano-silicon dioxide and deionized water to the mixture and then stirring, adding ruthenium(III) chloride solution to the mixture and then dispersing in ethylene glycol, adding sodium borohydride solution to the mixture and then washing, adding ethylene glycol and palladium(II) chloride solution to the mixture and then reacting, adding bismuth(III) nitrate solution to the mixture, and drying. USE - The method is useful for preparation of nano-catalyst, which is useful in electrocatalysis applications. ADVANTAGE - The method enables simple, easy and economical preparation of nano-catalyst with high yield and excellent stability. DETAILED DESCRIPTION - The preparation method of nano-catalyst involves dispersing graphene oxide in 30 ml deionized water and then mixing, adding urea to the mixture and then reacting at 160 degrees C for 3 hours, washing using ethanol and deionized water, adding nano-silicon dioxide and deionized water to the mixture and then stirring, adding ruthenium(III) chloride solution to the mixture and then dispersing in 50 ml ethylene glycol, adding sodium borohydride solution to the mixture and then washing using deionized water, adding 50 ml ethylene glycol and palladium(II) chloride solution to the mixture and then reacting for 1 hour, adding bismuth(III) nitrate solution to the mixture and then filtering, washing the filtrate, and drying.