▎ 摘　　要

NOVELTY - Preparation of iron cobalt sulfide-nitrogen and sulfur heteroatom reduction oxidation graphene (FeCo2S4/NSrGO) material comprises: (1) using calcining method to thiourea as nitrogen source and sulfur source for heteroatom doping to rGO: mixing and grinding rGO and thiourea, then raising the temperature to 700-1000degrees Celsius and calcining to obtain NSrGO; and (2) using two-step hydrothermal method to prepare FeCo2S4/NSrGO composite material by (i) adding NSrGO into deionized water, ultrasonically processing to obtain NSrGO solution; adding ferric nitrate nonahydrate, cobalt nitrate hexahydrate, ammonium fluoride and urea into NSrGO solution, and stirring; reacting the mixed solution, centrifuging and filtering, washing, and drying, and (ii) adding obtained composite material precursor into deionized water, adding sodium sulfide, ultrasonically processing, reacting, centrifuging and filtering, washing, and drying. USE - Preparation method of FeCoCo2S4/NSrGO material supported on the cathode of the fuel cell as the catalyst (claimed). Can also be used in energy storage or conversion device. ADVANTAGE - The FeCo2S4/N-S-rGO material has good oxygen reduction catalytic activity and wide application prospect. The material cost is only about 20% of the commercial platinum carbon, the economic benefit is obvious. The obtained catalytic material has excellent electro-catalytic activity. DETAILED DESCRIPTION - Preparation of iron cobalt sulfide-nitrogen and sulfur heteroatom reduction oxidation graphene (FeCo2S4/NSrGO) material comprises: (1) using calcining method to thiourea as nitrogen source and sulfur source for heteroatom doping to rGO: mixing and grinding rGO and thiourea, then raising the temperature to 700-1000degrees Celsius and calcining for 1-2 hours to obtain NSrGO, where the mass ratio rGO: thiourea = 0.05-0.1: 1.5-3.0; and (2) using two-step hydrothermal method to prepare FeCo2S4/NSrGO composite material by (i) adding NSrGO into deionized water, ultrasonically processing for 15-30 minutes at 20-25degrees Celsius to obtain NSrGO solution; adding ferric nitrate nonahydrate, cobalt nitrate hexahydrate, ammonium fluoride and urea into NSrGO solution, magnetically stirring for 15-30 minutes at room temperature to obtain mixed solution; putting the mixed solution into high pressure reaction kettle, after sealing, reacting for 8-12 hours at 100-100degrees Celsius, after finishing reaction, centrifuging and filtering, washing, drying at 40-80degrees Celsius for 10-20 hours to obtain composite material precursor; where 10-30 mg NSrGO is added every 20-50 ml deionized water, and molar ratio of ferric nitrate nonahydrate: cobalt nitrate hexahydrate: ammonium fluoride: urea = 1-3: 2-6: 5-9: 15 -18; mass ratio of NSrGO: the ferric nitrate hexahydrate is 6-3: 2-1; and (ii) adding the obtained composite material precursor into the deionized water, then adding sodium sulfide, ultrasonically processing for 15-30 minutes at 20-25degrees Celsius, and then putting the solution into a high pressure reaction kettle, reacting for 8-12 hours at 100-100degrees Celsius, after finishing reaction, centrifuging and filtering, washing, and drying at 40-80degrees Celsius for 10-20 hours to obtain the composite material, where each 20-50 ml deionized water added with 10-30 mg precursor and 0.05-0.15 g sodium sulfide. DESCRIPTION OF DRAWING(S) - The drawing shows an SEM image of the FeCo2S4/N-S-rGO material of the rGO as the substrate obtained in Example 1.