Influence of Ni-doping on CuCo2O4 electrode for enhanced supercapacitor performance and sustainable energy storage

• Published in: Journal of energy storage Vol. 98; p. 113151
• Main Authors: Ashraf, Mohsina, Abushad, M., Ansari, M. Yusuf, A.R., Shakeelur Raheman, Ansari, Khursheed B., Al Mesfer, Mohammed K., Khan, Mohd Shariq, Husain, Shahid, Khan, Wasi
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 20-09-2024
• Subjects: Bimetallic electrode; Charge-discharge kinetics; High stability; Nanostructures; Power density; Supercapacitor; Power density; Supercapacitor; Nanostructures; Bimetallic electrode; High stability; Charge-discharge kinetics
• ISSN: 2352-152X
• DOI: 10.1016/j.est.2024.113151

This work provides a revolutionary strategy for creating high-performance supercapacitors by designing and fabricating a unique nanostructured bimetallic oxide electrode. The proposed electrode leveraged the synergistic effects of metal oxides to enhance both energy density and charge-discharge kinetics. Ni-doped CuCo2O4 nanostructures (Cu1-xNixCo2O4) were synthesized in incremental order (x = 0.0, 0.05, 0.10, and 0.15) by facile sol-gel auto-combustion route. The nanostructures analyzed through x-ray diffraction, FTIR spectroscopy, Micro-Raman spectroscopy, x-ray photoelectron spectroscopy (XPS) and Scanning electron microscopy revealed the single phase and polycrystalline nature of CuCo2O4, with some impurity phases of CuO. The surface morphology studies showed numerous pores among the grains of Cu1-xNixCo2O4. Cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS) were used to investigate the electrochemical performance of synthesized Cu1-xNixCo2O4 samples. In a 3 M KOH electrolyte solution, the Cu1-xNixCo2O4 electrodes with x = 0.05 exhibited 2340 Fg−1 specific capacitance at 5 mVs−1, demonstrating superior electrochemical performance with excellent rate capability. Furthermore, it exhibited 35.88 Whkg−1 energy density, an exceptional 2484.74 Wkg−1 power density, and retained 99.9 % capacitance after 5000 cycles, demonstrating good stability. The results suggest that porous bimetallic oxide nanostructures can be promising candidates for the development of high-performance, environmentally friendly supercapacitors.
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•Novel Ni-doped CuCo2O4 tertiary nanocomposite is synthesized for supercapacitor.•The Cu1-xNixCo2O4 with x = 0.05, is carefully tailored to maximize capacitance.•Superior rate capability, offering 2340 F g-1 specific capacitance and 1426.47 W kg-1 power density.•Ni-doped CuCo2O4 electrode exhibited 99.9% stability after 5000 cycles at 100 mV/s.