Mesoporous hexagonal nanorods of NiCo2O4 nanoparticles via hydrothermal route for supercapacitor application

• Published in: Chemical physics letters 2022-08, Vol.800, p.139654, Article 139654
• Main Authors: Yewale, M.A., Kadam, R.A., Kaushik, N.K., Linh, N.N., Teli, A.M., Shin, J.C., Lingamdinne, L.P., Koduru, J.R., Shin, D.K.
• Format: Article
• Language: English
• Subjects: Charge transfer resistance; Electrochemical studies; Growth Mechanism; NiCo2O4 nanorods; Specific capatance; Supercapacitor; XPS
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/j.cplett.2022.139654

Scheme 1 Growth mechanism of mesoporous nanorods for NCO-5, NCO-8, NCO-14 sample. [Display omitted] •A hydrothermal method has been used to fabricate NiCo2O4 mesoporous hexagonal nanorods as electrode materials.•Mesoporous hexagonal nanorods show the highest specific capacitance of 1061F/g.•The specific energy density and specific power density of the NiCo2O4 electrode are 39 WhKg−1 and 683 Wkg−1. Binary metal oxide with a mesoporous microstructure has been considered a potential candidate electrode material for supercapacitor. The mesoporous microstructure of binary metal oxide improves electric conductivity. A mesoporous hexagonal microstructure of NiCo2O4 nanorods has been fabricated by a chemical hydrothermal method. Mesoporous hexagonal nanorods composed of small nanoparticles with an average thickness of 412 nm are prepared with a 14-hour hydrothermal reaction time. As synthesized, mesoporous hexagonal nanorods of NiCo2O4 as an electrode material show the highest specific capacitance of 1061 F/g and 184 mF/cm2 areal capacitance. The specific energy and specific power density of the NiCo2O4 electrode are 39 WhKg−1 and 683 Wkg−1. The equivalent charge resistance (Rs) and charge transfer resistance (Rct) of the NiCo2O4 electrode are 0.70 Ω and 43 Ω respectively. The NiCo2O4 electrode had an initial capacitance retention value of 81% after 3000 cycles.