▎ 摘　　要

NOVELTY - A graphene-coated sulfurized nickel-cobalt-iron trimetallic catalyst comprises nickel, cobalt and iron in the form of sulfides wrapped in graphene and loaded on nickel foam (NF). USE - Graphene-coated sulfurized nickel-cobalt-iron trimetallic catalyst. ADVANTAGE - The graphene-coated sulfurized nickel-cobalt-iron trimetallic catalyst: can be prepared by an economical method, exhibits prominent oxygen evolution reaction activity due to the high conductivity graphene coating and the introduction of sulfur; and has high catalytic performance and stability, fast mass transfer and electron transfer, and larger active surface area. DETAILED DESCRIPTION - A graphene-coated sulfurized nickel-cobalt-iron trimetallic catalyst comprises nickel, cobalt and iron in the form of sulfides wrapped in graphene and loaded on nickel foam (NF), and is of formula: (NixCoyFez)Su-NF (I). x/y, x/z, u = 0-10. An INDEPENDENT CLAIM is included for preparation of the graphene-coated sulfurized nickel-cobalt-iron trimetallic catalyst, which involves: (1) weighing cobalt nitrate hexahydrate, nickel nitrate hexahydrate and iron(III) nitrate nonahydrate, dissolving in deionized water, evenly stirring, then adding urea with 8-12 times the amount of nickel nitrate hexahydrate, stirring for 0.2-0.5 hour in a constant temperature water bath at 40degrees Celsius, and configuring to obtain a uniform nickel-cobalt-iron trimetallic hydroxide precursor slurry; (2) immersing the NF in dilute sulfuric acid for 10-40 minutes, then taking out, ultrasonically cleaning for 5-20 minutes, ultrasonically cleaning two times with ultrapure water for 30-90 minutes, ultrasonically cleaning 3-5 times with absolute ethanol, and drying in a vacuum oven at 80degrees Celsius for 1-3 hours to obtain a treated NF; (3) placing the treated NF in the nickel-cobalt-iron trimetallic hydroxide precursor slurry, reacting at 120-180degrees Celsius for 10-30 hours in a hydrothermal manner, and taking out the NF to obtain a trimetallic hydroxide catalyst loaded on NF; and (4) taking carbon disulfide solution as a source of sulfur and graphene, placing the trimetallic hydroxide catalyst loaded on NF in a corundum crucible, reacting in a tubular furnace under the protection of argon at 500-1000degrees Celsius for 1-5 hours, and cooling to room temperature.