Sphere-shaped CuCo2O4 nanostructures battery type electrode for supercapacitor via hydrothermal synthesis approach

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2023-12, Vol.679, p.132541, Article 132541
• Main Authors: Yewale, M.A., Kadam, R.A., Nakate, Umesh T., Teli, A.M., Kumar, V., Beknalkar, S.A., Jadhavar, A.A., Kadam, S.L., Shelke, Nitin T., Shin, D.K.
• Format: Article
• Language: English
• Subjects: activated carbon; active sites; batteries; Battery type electrode, supercapacitor; electrochemical capacitors; electrochemistry; electrodes; electrolytes; energy; FE-SEM; Hydrothermal method; Knobbly surface spherical balls; nanoparticles; porosity; surface area; TEM; XPS
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.132541

Transition metal oxide (TMO) is expected to be a highly competitive electrode material for energy storage applications based on its superior electrical and theoretical capacity in supercapacitors. However, a larger surface area and higher porosity are required to improve the electrode's electrochemical performance for practical applications. The nanostructured CuCo2O4 nanoparticles was prepared via a simple hydrothermal process with increased surface area and favorable active site to promote electrolyte penetration. The optimal hydrothermal reaction time was investigated to allow nanoparticle overgrowth, which will be critical in determining the specific surface area of the electrode material. The CuCo2O4 prepared at 7 h hydrothermal reaction period, (i.e. CCO-7 h) battery type electrode revealed a capacity of 193 F/g (96.5 C/g) at 3 mA/cm2 and capacity retention of 85.9% over 6000 cycles at 15 mA/cm2. Furthermore, the activated carbon and CCO-7 h (CCO//AC) asymmetric supercapacitor (ASC) exhibited energy and power densities of 2.120 Wh/kg and 277 W/kg, respectively with a capacity retention of 64% after 2000 cycles. The binary metal oxide CuCo2O4 with unique morphology could be a promising battery type electrode for supercapacitor device application. [Display omitted] •Spherical balls having the nanostructure of CuCo2O4 have been created using a hydrothermal technique.•The effect of hydrothermal reaction timeframe on an electrode's electrochemical performance has been observed.•Overgrowth of CuCo2O4 nanoparticles on the knobbly surface improves electrode's electrochemical performance at 7 h of reaction time and shows a specific capacitance of 432 F/g.