Transition metal oxides are ideal electrode materials used for supercapacitors. However, the synthesis of transition metal oxides suffers from drawbacks such as high reaction temperature and energy consumption. Herein, we report the synthesis of sea urchin-like Co₃O₄-NiO composites supported on graphene oxide (GO) using a hydrothermal method followed by calcination with a low temperature (250 °C). The obtained Co₃O₄-NiO/GO composite demonstrates a high specific capacitance of 883 F g⁻¹ at 1 A g⁻¹. Furthermore, upon coupling with an activated carbon (AC) positive electrode, an asymmetric cell of Co₃O₄-NiO/GO//AC exhibits outstanding stability reflected by the high capacitance retention of 82% at a high current density of 10 A g⁻¹. The excellent electrochemical properties of the composite may be attributed to the good synergistic effect of Co₃O₄ and NiO, as well as the assembly of Co₃O₄ and NiO into a sea urchin structure, which results in increased electron conductivity and more exposed electroactive sites leading to the promotion of the Faradaic redox process.

过渡金属氧化物是用于超级电容器的理想电极材料。然而，过渡金属氧化物的合成具有诸如高反应温度和能量消耗的缺点。本文中，我们报告了使用水热法，然后在低温（250℃）下煅烧，合成负载在氧化石墨烯（GO）上的海胆状Co ₃ O ₄ -NiO复合材料。所获得的Co ₃ O ₄ -NiO / GO复合材料在1 A g ^-1下显示出883 F g ^-1的高比电容。此外，与活性炭（AC）正极耦合后，Co ₃ O ₄的不对称电池-NiO / GO // AC在10 A g ^-1的高电流密度下具有82％的高电容保持率，表现出出色的稳定性。该复合材料的优异的电化学性能可以归因于Co的良好协同效应₃ ö ₄和NiO，以及该组件的Co ₃ ö ₄和NiO成海胆结构，这导致增加的电子传导性和多个暴露电活性位点，从而促进了法拉第氧化还原过程。