Exploration of Cr2O3-NiO nanocomposite as a superior electrode material for supercapacitor applications

The chromium oxide-nickel oxide nanocomposite (Cr2O3-NiO NC) was synthesized via a facile hydrothermal approach. The prepared Cr2O3-NiO NC was investigated for various structural, functional, morphological, and elemental analyses using XRD, FTIR, SEM, HR-TEM, and EDX techniques. Cyclic Voltammetry (CV) study revealed that the synthesized composite delivers higher specific capacitance of 333.4 F/g at 10 mV/s. The electrochemical impedance spectra (EIS) revealed lower solution resistance (Rs), charge transfer resistance (Rct) of 0.99 ohm and 1.04 ohm respectively. The Galvanostatic charge-discharge (GCD) analysis reveals the good stability, good redox rate capability, and faradaic nature of the electrode material. The cyclic stability of Cr2O3-NiO NC exhibited good capacitive retention of 87.7% even after 2000 cycles.

Automated summary

The Cr2O3-NiO NC synthesized by hydrothermal method showed superior electrochemical performance with higher specific capacitance and lower resistance. The electrode material exhibited good stability and reversibility, maintaining 87.7% capacitance retention even after 2000 cycles.