Abstract
A binder-free positive electrode material of 3D starfish-like Co_3O_4/Ni forest is fabricated via a novel and facile hydrothermal process followed by thermal treatment. The morphological studies clearly showed the construction of starfish-like micro-flowers of Co_3O_4 nanostructure forest densely covered on the entire Ni current collector. The 3D-Co_3O_4/Ni electrode displayed an areal capacity as high as 143.28 mC cm~(-2) at 0.5 mA cm~(-2) and higher stability of 88.4% after 5000 cycles. Moreover, the fabricated 3D-Co_3O_4/Ni||3D-Bi_2O_3/Ti supercapattery delivered a maximum areal capacitance of 24.73 mF cm~(-2), the energy density of 6.73 uWh cm~(-2) and power density of 5250 uW cm~(-2) with good cycling stability > 71% capacity retention after 5000 cycles. The higher electrochemical performance of the electrode is delivered due to the availability of abundant electrochemically active sites in the 3D starfish-like Co_3O_4 microflower, which facilitates a higher electrochemical reaction. The starfish-like forest architectures allow rapid ion diffusion, and the binder-free electrode reduces the contact resistance, which fasten the electron transport. These tolerable results prompt the as-prepared electrode with 3D starfish-like Co_3O_4 microflower morphology as an auspicious positive electrode material for electrochemical energy storage devices.
NSTL
Elsevier