<p class="PaperAbstract">In this work, NiCo₂O₄ nanoparticles with enhanced supercapacitive performance have been successfully synthesized via a facile sol-gel method and subsequent calcination in air. The morphology and composition of as-prepared samples were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray dif­fraction (XRD), and Raman spectroscopy (Raman). The electrochemical per­formances of NiCo₂O₄ nanoparticles as supercapacitor electrode materials were evalu­ated by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) tests in 3 mol L^-1 KOH aqueous solution. The results show that as-prepared NiCo₂O₄ nanoparticles have diameters of about 20-30 nm with uniform distribution. There are some interspaces between nanoparticles observed, which could increase the effective contact area with the electrolyte and provide fast path for the insertion and extraction of electrolyte ions. The electrochemical tests show that the prepared NiCo₂O₄ nanoparticles for supercapacitors exhibit excellent electrochemical performance with high specific capacitance and good cycle stability. The specific capacitance of NiCo₂O₄ electrode has been found as high as 1080, 800, 651, and 574 F g^-1 at current densities of 1, 4, 7, and 10 A g^-1, respectively. Notably, the capacitance retention rate (compared with 1 A g^-1) is up to 74.1 %, 60.3 %, and 53.1 % at current densities of 4, 7, and 10 A g^-1, respectively. After 100 cycles, higher capacitance retention rate is also achieved. Therefore, the results indicate that NiCo₂O₄ material is the potential electrode material for supercapacitors.</p>