Synthesis of 1D nanorod and 2D nanoflake mixed structures of nickel cobaltite: an efficient diffusion-controlled electrode material for asymmetric supercapacitor application

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2024-04, Vol.130 (4), Article 263
• Main Authors: Sathiyaseelan, M., Kunhikrishnan, Lakshmi, Rosy, P. Jacquline, Sivashanmugam, G., Preethi, B.
• Format: Article
• Language: English
• Subjects: Asymmetry; Characterization and Evaluation of Materials; Cobalt oxides; Condensed Matter Physics; Electrochemical analysis; Electrode materials; Lithium-ion batteries; Machines; Manufacturing; Nanorods; Nanotechnology; Nickel compounds; Optical and Electronic Materials; Physics; Physics and Astronomy; Processes; Rechargeable batteries; Supercapacitors; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-024-07439-1

The intercalation pseudocapacitance mechanism holds the potential to significantly narrow the gap between supercapacitors and lithium-ion batteries, particularly in terms of energy density and power density properties. Herein, 1D nanorod and 2D nanoflake mixed structures of nickel cobaltite (NiCo 2 O 4 ) were prepared for asymmetric supercapacitor application. For comparison, the NiO and Co 3 O 4 materials were also prepared, and examined their supercapacitor properties. The NiCo 2 O 4 store charges through the diffusion-controlled process and delivers the specific capacity of 347 C g −1 (694 F g −1 ) at 1 A g −1 and it withstands 96% of initial capacity after 5000 cycles at a current density of 10 A g −1 . Furthermore, the asymmetric supercapacitor device (NiCo 2 O 4 //AC) exhibits the specific capacity of 141 C g −1 (88 F g −1 ) at 1 A g −1 , with an excellent energy and power density of 31.3 Wh kg −1 and 800 W kg −1 respectively. The device retained 86% of its initial capacity after 5000 GCD cycles at 10 A g −1 . Therefore, the 1D/2D mixed morphologies with diffusion-controlled charge storage process are guaranteed to achieve superior electrochemical performance.