High energy density supercapattery empowered by efficient binder-free three-dimensional carbon coated NiCo2O4/Ni battery and Fe3S4@NiCo pseudocapacitive electrodes

Abstract

Through the progress of science and technology, the findings of supercharged electrodes are provoked to design the electrode material. Herein, a novel electrode made up of binary metallic oxide surrounded by a carbon matrix is designed as the positive electrode material that is substantially more active and efficient than the most reported electrode materials. The as-synthesized 3D-C-NiCo2O4 electrode revealed a specific capacity of 558.3C g−1 at 1 A g−1. Likewise, the 3D-Fe3S4@NiCo/SS electrode is effectively synthesized via the vapour phase growth method that worked as a negative pseudocapacitive material. It provides a gravimetric capacitance of 808.05 F g−1 at 1 A g−1. Moreover, the assembled 3D-C-NiCo2O4//3D-Fe3S4@NiCo/SS reveals a higher gravimetric capacitance of 150 F g−1 at 1 A g−1 with 70 % stability over 10,000 cycles. It offers a maximum energy and power density of 49.8 Wh kg−1 and 8100 W kg−1, respectively. These exceptional outcomes highlight that the as-fabricated 3D-C-NiCo2O4//3D-Fe3S4@NiCo/SS device can be an ultimatum source for high-performance energy findings. The present result demonstrates the combined approach of prepared electrodes, merits of battery type 3D-C-NiCo2O4 electrode, and the faradaic capacitance of 3D-Fe3S4@NiCo electrode.