<p>Simple hydrothermal method was used to grow sea urchin-like manganese cobalt oxide (MnCo₂O₄) nanosphere in situ on a nickel foam substrate. TEM images revealed that the sea urchin-like MnCo₂O₄ nanosphere was assembled from one-dimensional MnCo₂O₄ nanoneedles, which were about 19 nm and were composed of nanoparticles. Electrochemical tests indicate that the synthesized MnCo₂O₄ nanosphere exhibited high specific capacitance (2116 F g⁻¹ at 1 A g⁻¹), excellent high current density cycling stability (95% retentions after 8000 cycles at 10 A g⁻¹), and low charge transfer resistance (0.134 Ω). The assembled supercapacitor (SC) device had an energy density of 33.5 Wh kg⁻¹ at a power density of 700 W kg⁻¹. These results indicate that MnCo₂O₄ sea urchin-like nanosphere is an ideal candidate for high-performance supercapacitor electrodes.</p>