Facile fabrication of novel efficient NiCo2O4@NiAl-LDH/NF and high electrochemical performance Fe2O3@rGO electrodes for hybrid supercapacitors

Abstract

The study presents a novel ultra-high power density hybrid supercapacitor composed of NiCo₂O₄@NiAl layered double hydroxide (LDH) nano-tree arrays on nickel foam (NF) serving as the anode and Fe₂O₃@rGO hollow spherical nanoparticles as the cathode. NiCo₂O₄@NiAl layered double hydroxide LDH nano-tree arrays (NAs) without a binder were prepared with a hydrothermal method, and hollow spherical Fe₂O₃@rGO nanoparticles were fabricated by a mixed solvothermal route. The characterization of the NiCo₂O₄@NiAl-LDH/NF electrode revealed hollow spheroids aggregated by nanoparticles, showcasing a high specific capacity of 1219.2 C g⁻¹ at 1.6 A g⁻¹. The anode exhibited remarkable cycle stability with 99.1% capacitance retention at 10 A g⁻¹ over 2000 cycles. The Fe₂O₃@rGO cathode displayed an excellent specific capacitance of 1174.2 C g⁻¹ at 1 A g⁻¹. When assembled, the hybrid supercapacitor demonstrated an impressive energy density of 107.3 W h kg⁻¹ and power density of 1008.3 W kg⁻¹, highlighting outstanding cycle features and ultra-energy density. This research introduces a viable strategy for synthesizing and assembling high-performance capacitors, showcasing potential advancements in energy storage technology.