One-step electrodeposition of nickel cobalt sulfide nanosheets on Ni nanowire film for hybrid supercapacitor

Abstract

Bimetallic metal sulfides have been intensely studied as electrode materials for energy storage. However, the synthesis methods are often multi-step. Herein, we proposed a simple one-step electrodeposition of nickel cobalt sulfide nanosheets on 3D Ni nanowires film. The as-synthesized Ni@Ni–Co–S was directly employed as electrode for supercapacitor. Taking advantages of 3D conductive nanostructure for Ni substrate and mesoporous nanosheets nature for active material Ni–Co–S, the as-fabricated electrode exhibits a high capacity of 392.8 C cm−3 at 0.5 A cm−3 and excellent rate capability. A hybrid supercapacitor based on Ni@Ni–Co–S positive electrode and rGO-CNTs negative electrode was fabricated for practical supercapacitor application. Our device demonstrated a high energy density of 18.4 mWh cm−3 at a power density of 254.5 mW cm−3 and excellent long term cycle performance with 90.5% capacitance retention after 10000 cycles.