Porous oxygen-doped NiCoP nanoneedles for high performance hybrid supercapacitor

•O-doped NiCoP nanoneedles were synthesized by hydrothermal process and subsequent phosphorization treatment.•O-doped NiCoP electrode showed high specific area capacity and mass capacity.•The assembled hybrid supercapacitor delivered a high energy density of 30.52 Wh kg−1 at a power density of 749.36 W kg−1.•The device retained 80.47% of its capacitance over 5000 cycles. The preparation of electrode materials with high performance is of great significance to the practical application of supercapacitors. Here, O-doped NiCoP (ONiCoP) electrode material with porous nanoneedle structure was synthesized in-situ on carbon cloth by hydrothermal process and subsequent phosphorization treatment with high mass loading of 5.07 mg cm−2. The electrode combined the large specific surface area of porous nanoneedle, the high electronic conductivity of phosphide and the electronic structure regulation of oxygen element, which finally showed excellent electrochemical performance. The optimized ONiCoP electrode delivered a high specific area capacity of 3457 mC cm−2 at a current density of 1 mA cm−2 and a high specific mass capacity of 621 C g−1 at a current density of 1 A g−1. The hybrid supercapacitor composed of ONiCoP positive electrode and commercial activated carbon negative electrode exhibited a high energy density of 30.52 Wh kg−1 at a power density of 749.36 W kg−1. The hybrid supercapacitor composed of ONiCoP positive electrode and commercial activated carbon electrode exhibited high energy density and power density. [Display omitted]