Novel ZnO@CoFe₂O₄ and CoFe₂O₄ nanocomposites have potential applications on account of their high surface area and electrical properties. These two nanocomposite electrodes on nickel foam were developed for high performance electrochemical supercapacitor applications using a low-cost and facile one-step hydrothermal approach. The surface morphologies and electrochemical properties of the ZnO@CoFe₂O₄ and CoFe₂O₄ nanocomposites were examined by field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry, galvanostatic charge–discharge cycling, and electrochemical impedance spectroscopy. The electrochemical tests indicated that the ZnO@CoFe₂O₄ nanocomposite electrode achieved a high specific capacitance of 4050.4 F g⁻¹ at 10 mA cm⁻² with a high energy density of 77.01 W h kg⁻¹ in a 3 M KOH aqueous solution. This electrode exhibited attractive cycling stability and specific capacitance with approximately 90.9% capacity retention after 1000 cycles. On the other hand, the CoFe₂O₄ electrode showed lower specific capacitance (3499.9 F g⁻¹) and cycling stability (50.07%) than the ZnO@CoFe₂O₄ nanocomposite electrode. These results highlight the potential of these ZnO@CoFe₂O₄ nanocomposite electrodes as electrodes for next generation supercapacitor applications in high energy density storage systems.

中文翻译：

---

镍泡沫上生长 的新型纳米复合ZnO @ CoFe ₂ O ₄微球的构建，用于高性能电化学超级电容器

新型ZnO @ CoFe ₂ O ₄和CoFe ₂ O ₄纳米复合材料因其高表面积和电性能而具有潜在的应用前景。镍泡沫塑料上的这两个纳米复合电极是使用低成本且简便的一步式水热方法开发的，用于高性能电化学超级电容器。ZnO @ CoFe ₂ O ₄和CoFe ₂ O ₄的表面形态和电化学性能纳米复合材料通过场发射扫描电子显微镜，能量色散X射线光谱，X射线光电子光谱，循环伏安，恒电流充放电循环和电化学阻抗光谱进行了检查。电化学测试表明，在3M KOH水溶液中，ZnO @ CoFe ₂ O ₄纳米复合电极在10 mA cm ^-2时具有4050.4 F g ^-1的高比电容，在77.01 W h kg ^{-1的条件下}具有高能量密度。该电极表现出有吸引力的循环稳定性和比电容，经过1000次循环后，容量保持率约为90.9％。另一方面，CoFe ₂ O ₄电极显示出比ZnO @ CoFe ₂ O ₄纳米复合电极低的比电容（3499.9 F g ^-1）和循环稳定性（50.07％）。这些结果突出了这些ZnO @ CoFe ₂ O ₄纳米复合电极在高能量密度存储系统中作为下一代超级电容器应用电极的潜力。