▎ 摘　　要

NOVELTY - Preparation of carbon hollow sphere composite material involves adding a nickel-cobalt-doped polydopamine-coated silica to a graphene oxide dispersion, centrifuging, drying, and naturally cooling to room temperature to obtain a solid, mixing with anhydrous ethanol, ultrasonically-processing, adding a platinum compound, ultrasonically-processing, evaporating ethanol, and drying under vacuum to a mixed solution, ultrasonically-dispersing in formamide, heating, refluxing, and centrifuging to obtain platinum-graphene oxide-nickel-cobalt-doped silica solid, dissolving soluble starch and dicyandiamide in anhydrous ethanol, adding the platinum-graphene oxide-nickel-cobalt-doped silica solid, ultrasonically-processing, and evaporating ethanol to obtain a solid mixture as a catalyst precursor, and heating in a nitrogen atmosphere, naturally cooling to room temperature, immersing the product in 4 mol/L potassium hydroxide solution, stirring, centrifuging, washing with water, and drying. USE - Preparation of carbon hollow sphere composite material used as electrocatalyst for oxygen reduction reaction (claimed). ADVANTAGE - The method enables simple and economical preparation of carbon hollow sphere composite material having improved stability and catalytic activity, and low platinum content. DETAILED DESCRIPTION - Preparation of carbon hollow sphere composite material with low platinum content involves preparing (i) a nickel-cobalt-doped polydopamine (PDA)-coated silica of formula: PDA-Co3Ni1-SiO2 (I), adding (ii) 500 mg compound (I) to a graphene oxide dispersion having a concentration of 0.5 mg/mL, uniformly stirring, centrifuging, drying under vacuum at 40 degrees C, increasing the temperature to 850 degrees C at a rate of 5 degrees C/minu0074e under a nitrogen atmosphere, maintaining at a constant temperature for a certain time period, and naturally cooling to room temperature to obtain a solid, mixing (iii) the solid with anhydrous ethanol, ultrasonically-processing, adding a platinum compound, ultrasonically-processing, evaporating ethanol, and drying under vacuum at room temperature to a mixed solution, in which the mass ratio of solid with respect to platinum compound is 50:1-5, ultrasonically-dispersing (iv) the mixed solution in formamide, heating at 135 degrees C, refluxing, and centrifuging to obtain platinum-graphene oxide-nickel-cobalt-doped silica solid, dissolving (v) soluble starch and dicyandiamide in anhydrous ethanol, adding the platinum-graphene oxide-nickel-cobalt-doped silica solid, ultrasonically-processing, and evaporating ethanol to obtain a solid mixture as a catalyst precursor, in which the mass ratio of soluble starch, dicyandiamide and platinum-graphene oxide-nickel-cobalt-doped silica solid is 1:10:(20-60), and heating (vi) the catalyst precursor at 800 degrees C at a rate of 4 degrees C/minute in a nitrogen atmosphere, maintaining at constant temperature for a certain time period, naturally cooling to room temperature, immersing the obtained product in 4 mol/L potassium hydroxide solution, stirring at room temperature, centrifuging, washing with water until becomes neutral, and drying under vacuum at 50 degrees C.