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CeNiO3 (CNO) supercapattery is an emerging energy storage device. It brings together the high specific power of supercapacitors and the high specific energy of batteries. In general, the porous nature,...

Energy storage mechanism and catalytic performance of the Mn₂O₃/NiCo₂O₄ composite material.

High-performance supercapatteries have gained excellent research interest due to their high energy-power delivering capability, rapid charge/discharge, and prolonged cycle life. However, their low specific capacitance, poor rate capability, and inferior energy density of the electrode material constrained their practicality. In numerous energy storage devices, perovskite oxides achieve great importance due to their structural stability and electron conductivity. In the present work, binder-free CeNiO 3 (CNO) nanoparticles are grown on Ni-foam as a supercapattery electrode material. The CNO nanoparticles are successfully grown on Ni-foam as a current collector using a one-step hydrothermal method and an annealing process. This nanostructured perovskite oxide in the Ni-foam reduces the agglomeration and provides efficient pathways for fast charge transport. The synergistic effect, and varying valence states of Ce and Ni in the perovskite structure elucidate fast charge transfer kinetics. The CNO@Ni-foam electrode exhibits the highest specific capacity of 278 C g À1 at 1 A g À1 in a 6 M KOH electrolyte. Further, the constructed symmetric cell CNO//CNO operates at 1.55 V and exhibits high specific capacity (179.81 C g À1 ), high energy density (38.70 W h kg À1 ), and high-power density (7750 W kg À1 ) with long cycle durability (20 000 cycles). The supercapattery exhibits outstanding rate capability and good cyclic stability of 92% from its maximum specific capacity at a current density of 5 A g À1 .

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