Doping based induced defects and morphol. tuning in nickel sulfide plays a crucial role for performance improvement and stability.So, in pursuit of high-performance supercapacitors, the morphol. and conductivity of nickel sulfide (NiS) nano-sheets have been tailored through strategic doping with transition metal zinc (Zn).The Zn incorporation in NiS induced structural and electrochem. changes with varying doping concentrations of 1 %, 3 % and 5 % (total weight of host material) named as NiZn1S, NiZn3S and NiZn5S resp.The morphol., chem., structural, compositional and optical results of SEM, TEM, HRTEM, EDS, XRD, FTIR, PL and UV revealed NiZn3S to be the best as its nano-sheets like morphol. has offered high active surface area which ultimately increases the electrochem. performance as well as stability.The supreme specific capacitance of NiZn3S recorded 1322 Fgusc1 at 1 Agusc1 with splendid cyclic retention of 94 % after 5000th cycles.NiZn3S exhibited both charge storage mechanisms with 29 % capacitive controlled and 71 % diffusive controlled contribution ratio at 5 mVsusc1.The power law (b = 0.67) and pseudocapacitive behavior dominated by observing increased trend in capacitive (surface) contribution ratio with increased scan rate proves its suitability for supercapacitors.