The green CuO NPs were successfully synthesised by green solution combustion method. The average crystallite size of green solution combustion CuO nanoparticles (gsc-CONPs) was found to be 40.64 nm and confirmed by powder X-ray diffraction (PXRD) analysis. The UV-DRS spectrum revealed average energy gap of 1.75 eV for gsc-CONPs. Cyclic voltammetry (CV) and Electrochemical impedance spectroscopy (EIS) techniques have been employed to analyse the electrochemical properties of the synthesized sample by using carbon paste electrodes in 1M KOH solution. The observed results suggest superior electrochemical properties of gsc-CONPs electrode due to its lower value of EO-ER. It also exhibited better sensor characteristics for paracetamol and glucose molecules. The proton diffusion coefficient (D) for the gsc-CONPs electrode material was found to be 1.134 × 10-4 cm 2 s -1 . The g-CONPs have also been tested for its photocatalytic activity using indigo carmine (IC) dye. The mechanism suggests that the crucial role was played by OH radicals during dye degradation. The results support the claim of the synthesized gsc-CONPs as a promising material for photocatalytic and supercapacitor applications.