▎ 摘　　要

NOVELTY - Electrochemical preparation method of porous nickel-cobalt/graphene electrode involves: (1) cutting foamed nickel, ultrasonically degreasing with an alkaline degreasing liquid, and ultrasonically cleaning with deionized water, (2) adding plating solution to a beaker, heating, and adjusting the pH value of the plating solution to 2-2.5 with dilute sulfuric acid solution; (3) adding a nickel block and the pretreated foam nickel vertically to an electrolytic cell, using the nickel block as an anode and the foamed nickel as a cathode, connecting to a pulse power supply, pouring the pretreated plating solution into the cell and turning on the magnetic stirrer; (4) turning on pulse power switch with an apparent current density of 12.5 A/dm2, setting waveform to pulse, working state to steady flow and operating period to cyclic, connecting load, and electroplating; and (5) washing the foam nickel plating sheet with deionized water, and drying. USE - Electrochemical preparation method of porous nickel-cobalt/graphene electrode used for electrocatalytic hydrogen evolution. ADVANTAGE - The method provides electrode with compact surface and excellent electrocatalytic hydrogen evolution activity. DETAILED DESCRIPTION - Electrochemical preparation method of porous nickel-cobalt/graphene electrode involves: (1) cutting foamed nickel to a required size, ultrasonically degreasing with an alkaline degreasing liquid, and ultrasonically cleaning 3 times with deionized water for 5 minutes in an ultrasonic cleaner, (2) pretreating a plating solution by adding plating solution to a beaker, heating at 50 degrees C, and adjusting the pH value of the plating solution to 2-2.5 with dilute sulfuric acid solution, where the plating solution comprises deionized water, nickel(II) chloride hexahydrate, nickel(II) sulfate heptahydrate, cobalt(II) sulfate heptahydrate, boric acid, saccharin, sodium lauryl sulfate, and nano graphene sheets; (3) adding a nickel block and the pretreated foam nickel vertically to an electrolytic cell, fixing the distance between the nickel block and the foam nickel to 6 cm, placing the cell on a magnetic stirrer, using the nickel block as an anode and the foamed nickel as a cathode, connecting to a pulse power supply, pouring the pretreated plating solution into the cell, turning on a magnetic stirrer and adjusting to a speed of 350-450 rpm; (4) turning on pulse power switch with an apparent current density of 12.5 A/dm2, setting waveform to pulse, working state to steady flow and operating period to cyclic, then setting the number of (T1) positive pulses to 1, positive duty cycle to 50%, (T1) negative pulse number to 0, negative duty cycle to 0%, frequency to 1200 Hz, (T1) time to 30 seconds, current to 0.5 A, and (T2) and (T3) time to 0, then connecting load, and electroplating for 20-30 minutes; and (5) washing the foam nickel plating sheet with deionized water, and drying.