Construction of three‐dimensional marigold flower‐shaped Ni<sub>3</sub>V<sub>2</sub>O<sub>8</sub> for efficient solid‐state supercapacitor applications
Krishna Kanta Haldar, Rathindranath Biswas, Anil Arya, Imtiaz Ahmed, Shweta Tanwar, Achchhe Lal Sharma
Abstract
Abstract Development of binary spinel‐type mixed metal oxide and fabrication various morphological heterostructure nanomaterials having two distinct metals paid a wide attention in emerging field. Here, we prepared three‐dimensional (3D) marigold flower‐like Ni 3 V 2 O 8 structure via a simple and facile technique for electrochemical supercapacitor applications. 3D Ni 3 V 2 O 8 with thick petals as cathode materials exhibits high specific capacitance of 263.12 F g −1 at a scan rate of 0.5 mA cm −2 . The high energy density of 32.98 W h kg −1 at power density of 189.96 W kg −1 is obtained by the cathode formation of marigold flower‐shaped Ni 3 V 2 O 8 , indicating excellent ions accessibility and large charge storage ability of Ni 3 V 2 O 8 structure. It is also observed that even after 5000 cycles charging‐discharging profile analysis, Ni 3 V 2 O 8 cathode retains 32% of its initial capacitance along with 100% Coulombic efficiency. This higher capacitance retention strengthens its adoption as a potential candidate for supercapacitor application.