▎ 摘　　要

NOVELTY - Preparing nitrogen-nickel zinc copper layered double hydroxide/reduced graphene oxide (LDH/rGO) complex nanosheet on foamed nickel comprises (1) cutting foamed nickel sheet, ultrasonically cleaning with dilute hydrochloric acid, acetone, ultrapure water and ethanol, vacuum drying, (2) sequentially adding nickel (II) chloride hexahydrate, zinc chloride, copper chloride dihydrate and urea to ultrapure water, stirring, continuously adding graphene oxide (GO), ultrasonically dispersing, transferring reaction solution to reaction vessel, immersing pretreated foamed nickel sheet, sealing reaction kettle, heating to 100-150 degrees C for 10-15 hours, cooling, washing with ultrapure water and ethanol, vacuum drying to obtain nitrogen-nickel zinc copper LDH/rGO complex nanosheet array, and (3) placing the nanosheet array in ceramic crucible, placing the crucible in tube furnace, heating to 300-400 degrees C in an ammonia atmosphere, calcining for 1-3 hours and cooling. USE - The nanosheet is useful as bifunctional catalyst for the electrolytic anodic and cathodic oxidation of urea, ammonia and hydrazine (all claimed). ADVANTAGE - The nanosheet: has cell voltages of 1.305, 0.489 and 0.010 V for urea oxidation reaction, ammonium oxidation reaction and hydrazine oxidation reaction, respectively at a current density of 10 mAx cm(-2) which is lower than platinum carbon and iron (II) oxide complex; has good stability; and has unchanged current density for more than 3000 cycles.