▎ 摘　　要

NOVELTY - Ultra-long cycle composite supercapacitor positive electrode material N/P-graphene nanotubes loaded with nickel-cobalt bimetallic phosphide and its preparation method, are claimed. The method involves using N/P-graphene nanotubes as a skeleton material and obtaining the positive electrode material with interfacial bonding effect by depositing nickel-cobalt bimetallic phosphide nanoparticles on its surface by one-step phosphating method, where the interfaces are combined by N-nickel/cobalt and P-nickel/cobalt bonds. USE - As ultra-long cycle composite supercapacitor positive electrode material N/P-graphene nanotubes loaded with nickel-cobalt bimetallic phosphide. ADVANTAGE - The composite electrode material exhibits ultra-long cycle stability, maintains 90% original specific capacitance after 75,000 cycles at 50Ag-1 and provides a high-quality candidate positive electrode material for construction of a new generation of high-performance supercapacitors.