Emerging Ni3TiO5/NiTiO3 nanocomposites: Unlocking pseudocapacitive energy storage in symmetric supercapacitors

• Ni 3 TiO 5 /NiTiO 3 nanocomposite was prepared by Pechini method. • The electrochemical performance was studied in the three-electrode and the two-electrode systems. • Ni 3 TiO 5 /NiTiO 3 demonstrates specific capacitance of 354.5 F g ‒1 in the three-electrode system. • In the two-electrode system, specific capacitance value of 220 F g −1 was obtained. Supercapacitors (SCs) offer numerous benefits such as stability, high power density, cost efficiency, extended cycle life, rapid charging/discharging abilities, elevated specific capacitance (Cs), safety, and environmental sustainability among various energy storage systems. In SCs, the choice of materials for the electrode plays a vital role in the mechanism of charge storage. In this regard, the current work presented a novel Ni 3 TiO 5 /NiTiO 3 nanocomposite fabrication, characterization, and application as a novel SC. Ni 3 TiO 5 /NiTiO 3 nanocomposite was fabricated using the Pechini method and characterized by several analyses. The electrochemical performances were performed in three-electrode and two-electrode systems. Accordingly, different scan rate cyclic voltammograms exhibited fast reaction kinetics having pseudocapacitive characteristics owing to the efficient charge-storing mechanism imparted by Faradaic; the composited peak anodic current was calculated to be around 90 A g −1 . The galvanostatic charge-discharge (GCD) tests revealed a Cs of 354.5 F g −1 at 1 A g −1 and an excellent retention of 98.3% after 5000 cycles in the three-electrode system. In a two-electrode battery system, 220 F g −1 weighted Cs, 17.6 Wh kg −1 energy density, 733 W kg −1 power density, and remarkable cyclic stability (98.1% retention after 5000 cycles) were delivered. This work verifies Ni 3 TiO 5 /NiTiO 3 as a potential material for high-performance SCs.