Black phosphorus quantum dots embedded NiCoCu-LDH with porous structure for high-performance hybrid supercapacitor

Supercapacitors, as advanced electronic devices and energy storage systems for the next generation of electric vehicles, have garnered significant attention owing to their myriad of beneficial attributes. Compared to bimetallic layered double hydroxides (LDH) materials, trimetallic LDH exhibits superior electronic conductivity, faster ion diffusion, and minimal volume variation when employed as supercapacitor electrodes. In this work, the novel NiCoCu-LDH/black phosphorus quantum dots (BPQD) are directly anchored to carbon cloth (CC) using a simple precipitation method combined with hydrothermal technology, along with electrostatic adsorption. Due to abundant active sites, enhanced electron transfer, and stable microstructure, the pseudocapacitance of the prepared CC@NiCoCu-LDH/BPQD is about 1810.6F g −1 (1 A/g). In addition, the assembled asymmetric supercapacitor CC@NiCoCu-LDH/BPQD//activated carbon demonstrates an exceptionally high energy density (202.2Wh kg −1 @800 W kg −1 ) at a satisfactory operating voltage of 1.6 V, along with an extended cycle life, maintaining about 81.4 % capacitance after 10,000 cycles.