Facile synthesis of nanoflower-like NiMoO4/NiO structures for supercapacitive electrode materials

Unique NiMoO 4 /NiO nanocomposites (NCs) are synthesized by a straightforward hydrothermal process followed by annealing, using Ni(NO 3 ) 2 ·6H 2 O and Na 2 MoO 4 ·2H 2 O as sources of nickel and molybdenum, with urea playing a key role in determining the composition. A systematical characterization explores the variations rule of effect of urea levels on the chemical composition, crystalline structure, and electrochemical characteristics of these nanocomposites. Due to its unique design, the NiMoO 4 /NiO nanocomposites present a wealth of microporous active sites. Utilized as electrode materials, these nanocomposites demonstrate superior electrochemical properties , attaining a specific capacitance value of 1294.4 F g −1 when tested at a current density of 1 A g −1 . They also maintain 86.32 % of their initial capacitance after 5000 charge-discharge cycles. In a distinctive asymmetric supercapacitor setup, labeled NiMoO 4 /NiO//AC, the peak energy density achieved is 14.39 Wh kg −1 at a power density of 264.67 W kg −1 , with a retention of 69.97 % capacity after 5000 cycles, illustrating its long-term cycling stability. This research underscores the transformative potential of NiMoO 4 /NiO nanocomposites in advancing energy storage solutions. Nanoflower NiMoO 4 /NiO electrodes with layered structure store more charge and boost supercapacitor performance. • NiMoO 4 /NiO composites with a 3D flower-like structure were successfully synthesized. • The synergistic effect of NiMoO 4 and NiO enhances the electrochemical performance of the composites. • NiMoO 4 /NiO-2 exhibits a high specific capacitance of 1294.4 F g −1 at 1 A g −1 . • The NiMoO 4 /NiO-2//AC//ASC achieves 14.39 Wh/kg energy density at 264.67 W kg −1 power density.