Reduced Mo-doped NiCo 2 O 4 (R-Mo-NiCo 2 O 4 ) was facilely prepared through a dual-defect strategy. Mo-doped NiCo layered double hydroxide (Mo-NiCo-LDH) was used as the precursor and calcined in an air atmosphere, and the resultant Mo-doped NiCo 2 O 4 (Mo-NiCo 2 O 4 ) was further reduced by NaBH 4 . The number of oxygen vacancies in the obtained R-Mo-NiCo 2 O 4 is significantly increased by both Mo doping and NaBH 4 reduction, resulting in greatly enhanced electrical conductivity and facilitated charge transfer. Finally, the R-Mo-NiCo 2 O 4 was used as the electrode material in supercapacitors, which displayed greatly improved electrochemical performance, such as higher specific capacity (285.8 mA h g -1 at 1 A g -1 ), rate capability (86.1%) and cycling stability (87.4% retention after 5000 cycles).