The hierarchical nanorod-branched structure of NiO by P, Ni co-doping for boosting energy storage property as electrode materials of supercapacitor

Abstract

The inadequate exposure of active sites in nickel oxide-based energy storage materials fundamentally limits their energy efficiency and cycling stability. Herein, we report a strategic of phosphorus (P) and nickel (Ni) co-doped NiO heterogeneous nanomaterials (P, Ni-NiO/CC), engineered to achieve superior performance for supercapacitors. The elemental analysis confirms a phosphorus doping concentration of 0.91 at.%. As expected, the P, Ni-NiO/CC electrode delivered an outstanding reversible specific capacitance of 50.6 F cm -2 at 0.2 A cm -2 and demonstrated remarkable cycling durability with 93% capacity retention after 10000 cycles at 1 A cm -2 . This enhanced performance is attributed to the synergistic interplay between the unique P doping and the heterogeneous structure, which collectively improve charge transfer and structural stability. These excellent electrochemical performances confirm the great application potential of P, Ni-NiO/CC as electrode material for aqueous energy storage device.