Synthesis and characterization of Ni_0.85Co_0.15MoO₄ nanoparticles for supercapacitors

Abstract Modification of elemental doping has been identified as a promising strategy to enhance the electrochemical properties of nanomaterials. In the current study, a novel material, Ni 1− x Co x MoO 4 , was successfully synthesized using a simple chemical sol–gel approach. The impact of doping on the supercapacitors and structural characteristics of both NiMoO 4 and Ni 0.85 Co 0.15 MoO 4 was investigated through a range of analytical techniques such as x-ray diffraction, FT-IR, field emission scanning electron microscopy, Brunauer–Emmett–Teller, cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy. The results of the analysis revealed that introducing 15% cobalt into nickel molybdate led to significant improvements in its electrochemical behavior, resulting in the formation of the Ni 0.85 Co 0.15 MoO 4 nanocomposite with a notable specific capacitance of 408 F g −1 at a current density of 1 A g −1 , exceptional cycling stability, and 94.62% capacitance retention after 2000 cycles. The Ni 0.85 Co 0.15 MoO 4 nanocomposite electrode exhibited superior conductivity, a high specific surface area, and enhanced capacitance, thereby demonstrating excellent electrochemical performance when compared to NiMoO 4 (which displayed a specific capacitance of 272 F g −1 at 1 A g −1 ).