A CdCO₃/CdO/Co₃O₄ composite has been prepared on nickel foam through a combined hydrothermal-annealing method. An asymmetric hybrid supercapacitor (SC) device was assembled with this composite as the positive electrode and activated carbon was the negative electrode. The SC exhibited a high specific capacitance of 84 F g⁻¹ @ 1 mA cm⁻², a maximum energy density of 26.3 W h kg⁻¹, and a power density of 2290 W kg⁻¹, along with a wide potential window of 1.5 V and long cycle life (92% after 6000 cycles). SCs assembled in series powered various light-emitting diodes and moved an electrical mini-motor.

中文翻译：

---

基于泡沫镍负载的 CdCO3/CdO/Co3O4 复合材料的高性能非对称超级电容器

采用水热-退火相结合的方法在泡沫镍上制备了CdCO ₃ /CdO/Co ₃ O _{4复合材料。}用这种复合材料作为正极，活性炭作为负极，组装了一个不对称混合超级电容器（SC）装置。SC表现出84 F g ^-1 @ 1 mA cm ^-2的高比电容，26.3 W h kg ^-1的最大能量密度和2290 W kg ^-1的功率密度，以及宽的电位窗口1.5 V 和长循环寿命（6000 次循环后为 92%）。串联组装的 SC 为各种发光二极管提供动力，并移动一个小型电动马达。