The design and fabrication of advanced electrode materials for supercapacitor have been extensively explored recently. The spinel transition metal oxides have drawn considerable attentions because of their high theoretical capacity to store electrical charge. This work introduced a general hydrothermal assisted co-precipitation approach to fabricate five kinds of spinel MCo₂O₄ (M = Co, Mn, Fe, Mg and Zn) submicron prisms on nickel foams. Among these spinel MCo₂O₄ electrodes, the MgCo₂O₄ exhibited the highest specific capacity of 613.5 C g⁻¹ (0.883 C cm⁻²) at a current density of 2 mA cm⁻². All the specific capacities of bimetallic oxides were higher than single metal oxide Co₃O₄, indicating the enhanced electrochemical performance of bimetallic oxides. The correlations between peak currents and the square root of the scan rates of all prepared electrode materials showed OH⁻ diffusion-controlled characteristic in their redox reactions. Furthermore, an assembled MgCo₂O₄//AC hybrid supercapacitor (HSC) achieved a specific capacity and a specific energy of 182.8 C g⁻¹ at 0.5 A g⁻¹ and 39.7 W h kg⁻¹, respectively. More impressively, this MgCo₂O₄//AC HSC showed a subsequent increase about 21.1% in specific capacity after 5000 cycles, suggesting its promising characteristics for the next generation energy storage device.

最近已经广泛地探索了用于超级电容器的先进电极材料的设计和制造。尖晶石过渡金属氧化物由于其存储电荷的高理论容量而备受关注。这项工作介绍了一种通用的水热辅助共沉淀方法，以在镍泡沫上制造五种尖晶石MCo ₂ O ₄（M = Co，Mn，Fe，Mg和Zn）亚微米棱镜。在这些尖晶石MCo ₂ O ₄电极中，MgCo ₂ O ₄在2 mA cm ^-2的电流密度下表现出最高的比容量为613.5 C g ^-1（0.883 C cm ^-2）。。双金属氧化物的所有比容量均高于单金属氧化物Co ₃ O ₄，表明双金属氧化物的电化学性能增强。峰值电流和所有制备的电极材料的扫描速率的平方根之间的相关性表明：OH ^-在它们的氧化还原反应的扩散控制特性。此外，组装的MgCo ₂ O ₄ // AC混合超级电容器（HSC）在0.5 A g ^-1和39.7 W h kg ^-1时分别达到了182.8 C g ^-1的比容量和比能量。更令人印象深刻的是，这种MgCo ₂ O ₄// AC HSC在经过5000次循环后，其比容量随后增加了约21.1％，这表明其在下一代储能设备中的应用前景看好。