The zinc oxide-nickel oxide (ZnO-NiO) precursor salt was dispersed separately in the distilled water-mono hydric alcohols (methanol, ethanol) and distilled water solvent mediums via a co-precipitation route and then calcined at 450oC for 2 hrs to develop the zinc oxide-nickel oxide nanocomposites (ZnO-NiO, sample code ZONO-NC). The obtained final products were assessed using XRD and FE-SEM studies, which revealed distinct crystal structures (hexagonal phase of ZnO and cubic structure of NiO) and bi-type surface morphology. The surface structure, optical absorption edges, band gap values, PL emission, and specific capacitance values of the synthesized ZONO-NC results all varied significantly. The above-mentioned solvent-induced changes in properties instigate in the chemical reaction system of the zinc-nickel salt precursor solution. For suitable supercapicitor’s behaviour, the synthesized ZONO-NC was used as a working electrode to examine their current responses with respect to increasing scan rates potential from 10 to 100 mV/s, and the electrochemical performance are discussed in detail. Three different dyes (Orange G, Amidoblack 10B, and Direct Blue 71) were introduced with the synthesized water-methyl alcohol assisted ZONO-NC sample as a photocatalyts in the aqueous solvent, and their photocatalytic degradation efficiency was compared. The microbial efficacy of the synthesized nanocomposite was examined by taking Staphylococcus aureus and Escherichia coli strains.