Strategic engineering of NiO/Co3O4/rGO hybrid composite as a cathode material to enhance the electrochemical performance of supercapattery devices

• Published in: Journal of energy storage 2024-05, Vol.86, p.111037, Article 111037
• Main Authors: Mummoorthi, Geerthana, Kamarajar, Prakash, Jayaram, Archana, Easwaran, Senthil Kumar, Mani, Navaneethan
• Format: Article
• Language: English
• Subjects: Electrochemical performance; Energy storage materials; Hybrid energy devices; Power; Specific energy; Supercapattery device; Synergistic effect; Transition metal composition
• ISSN: 2352-152X; 2352-1538
• DOI: 10.1016/j.est.2024.111037

A supercapattery is a cutting-edge energy storage technology that combines high energy density of a battery with remarkable rate capability and power density of a supercapacitor. The improved performance is largely due to the successful assembly of NiO/Co3O4@rGO composite arrays using a hydrothermal method for supercapattery. At the same time, rGO serves as a conductive scaffold, facilitating efficient electron transport throughout the electrode material. In a three-electrode assembly, NiO/Co3O4@rGO electrode material performs well electrochemically, achieving value of 711C g−1 specific capacity at a current density of 1 A g−1. Because of their synergistic effect, exhibits a high-performance supercapattery device of NiO/Co3O4@rGO//α-Fe2O3/rGO with an impressive energy storage capabilities, efficient charge-discharge cycles, and extended cycle life was fabricated for the first time. With the proposed devices, the assembled asymmetric supercapattery yields power density of 795.3 W kg−1 and an ultrahigh energy density of 76.2 Wh kg−1. To enabling steadiness by demonstrating 10,000 consecutive continuous cycles of charge and discharging asymmetric supercapattery device exhibits outstanding performance. The advanced design shows an exceptional energy storage performance by delivering 99 percentage of columbic efficiency. It is a great option for addressing the current era's expanding need for high-performance and sustainable energy storage systems because of its specific features and tunability. Graphical abstract explains the hybrid cell setup with α-Fe2O3/rGO used as anode and NiO/Co3O4/rGO as cathode. Using PVA/KOH as gel electrolyte coated on Whatman filter paper as a separator provides ionically active for charge transport property but it acts as an electrically inactive property [Display omitted] •Single-step hydrothermal techniques and fast approaches used for synthesis of NiO/Co3O4/rGO ternary hybrids and α-Fe2O3/rGO via ultrasonication treatment.•The ultrasonication treatment on graphite oxide produces exfoliation of graphene oxide sheets.•In comparison to other contemporary metal oxide-based electrode materials, the NiO/Co3O4/rGO sample exhibits greater Specific capacity Csp 711 C g-1 at 1 A g-1.•For first time, the utilization of cathode (NiO/Co3O4/rGO) and anode (α-Fe2O3/rGO) materials in conjunction with rGO sheets is shown to enhance ion and electron transport, surface area, and stability.•The ASC device demonstrated a maximum energy density of 76