In-situ synthesis of three-dimensionally flower-like Ni3V2O8@carbon nanotubes composite through self-assembling for high performance asymmetric supercapacitors

To develop a high-performance positive electrode for asymmetric supercapacitor (ASC), a novel Ni 3 V 2 O 8 @carbon nanotubes (CNTs) composite with three-dimensionally (3D) flower-like structure is designed and prepared through an in-situ hydrothermal method . The particularly open architecture self-assembled by interlacement of Ni 3 V 2 O 8 nano-petals with a high surface area provides interconnected ion diffusion channels and highly exposed active centers for ion absorption. The electrical conductivity and charge transport are greatly improved by anchoring CNTs on Ni 3 V 2 O 8 . The synergistic effect between Ni 3 V 2 O 8 and CNTs gives rise to an improved electrochemical performance with high specific capacitance (1054 F g −1 at 1 A g −1 ), good rate capability and excellent cycling stability (89% capacitance retention after 10,000 cycles). An ASC equipped with a Ni 3 V 2 O 8 @CNTs positive electrode and an activated rice husk carbon (ARHC) negative electrode achieves a remarkable energy density of 45.5 Wh kg −1 at 795 W kg −1 and outstanding cycling stability after 10,000 cycles in a wide operating voltage window of 1.6 V. The impressive performance of the Ni 3 V 2 O 8 @CNTs composite makes it a promising candidate for commercial application.