Three-dimensional Bi2O3/Ti microspheres as an advanced negative electrode for hybrid supercapacitors

Abstract

Herein, we report a novel, low-temperature solvothermal method to grow 3D-Bi₂O₃ flower-like microspheres on Ti substrates as a binder-free negative electrode for supercapacitor applications. The Bi₂O₃/Ti electrode showed an areal capacitance of 1.65 F cm⁻² at 4 mA cm⁻². Moreover, the 3D-NiCo₂O₄||3D-Bi₂O₃ hybrid device delivered high energy and power densities of 31.17 μW h cm⁻² and 7500 μW cm⁻², respectively. The more optimal energy storage performance based on the strong adhesion of the current collector and self-assembled three-dimensional nanostructures permits efficient electron and ion transportation.