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Optimizing CeNiO3/NiO interfaces for enhanced pseudocapacitive capabilities in energy storage system
Journal article   Peer reviewed

Optimizing CeNiO3/NiO interfaces for enhanced pseudocapacitive capabilities in energy storage system

Areej Fatima, Asghar Nazir, Muhammad Madni, S. Shah, Abdullah K. Alanazi, G. Stevens and A.N. Ahmed
Journal of energy storage, v 152, 120595
30 Mar 2026
DOI: https://doi.org/10.1016/j.est.2026.120595

Abstract

CeNiO3/NiO nanocomposite Energy storage devices Pseudo-capacitor Two electrode setup
Novel supercapacitor materials are being engineered to cope with the growing need for environmentally friendly energy storage technologies worldwide. Here, a CeNiO3/NiO composite synthesized via hydrothermal route exhibits outstanding pseudocapacitive performance, surpassing its individual components (CeNiO3: 579.19 F/g; NiO: 289.97 F/g) by achieving 762.38 F/g at a 1 A/g current density. SEM reveals a plate-on-flake hierarchical nanostructure (0.038 μm), where NiO nanoplates uniformly anchor on CeNiO3 nanoflakes, forming a conductive, ion-permeable network. XRD confirms well-defined crystalline phases and strong interfacial coupling between CeNiO3 and NiO. The composite demonstrates improved conductivity characteristics, reflected by its low Rct of 15.81 Ω, large electrochemical surface area (110 cm2), and excellent stability retaining 95.76% and 94.42% capacitance after 10,000 (three-electrode) and 5000 (two-electrode) cycles, respectively. Post-stability XRD (Fig. S5) confirms structural robustness. The two-electrode device delivers 25.50 Wh/kg energy density at 0.074 kW/kg power. The enhanced performance arises from the complementary roles of CeNiO3 (high conductivity) and NiO (abundant redox sites), enabling efficient charge transfer, long term durability and steady ion diffusion makes composite a viable option for next-generation supercapacitors. [Display omitted] •The CeNiO3/NiO composite exhibits a high specific capacitance (762 F/g) at 1 A/g•Nanocomposite low Rct (15.81 Ω), with a 110 c/m2 electrochemical surface area.•Achieves (26.19 Wh /kg) at 173 kW /kg with a 0.49 V working window in a three-electrode system.

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