Although the emerging CuCo₂O₄ electrode material proves to be promising for use in energy-storage applications, its slow reaction kinetics and poor conductivity limit its broad utilisation. To address this challenging fundamental issue, herein, oxygen-vacancy-enriched CuCo₂O₄ nanoflowers is prepared using a facile hydrothermal method followed by thermal treatment in a hypoxic atmosphere. Because of the presence of oxygen defect sites and impurity bands, such flower-like CuCo₂O₄ nanomaterials with large specific surface areas demonstrate much superior electrical conductivity and favourable hydrophilic properties, which are highly encouraging for supercapacitor applications. Impressively, when evaluated as an active electrode material, it exhibits a remarkable specific capacitance (1006 F g⁻¹ at 1 A g⁻¹, i.e., 1.2 F cm⁻² at 1.2 mA cm⁻²), excellent rate capability (69.4% capacitance retention at 20 A g⁻¹) and ultra-long cycling lifespan (85.5% specific capacitance retention after 10,000 cycles). Moreover, when being paired with activated carbon, the quasi-solid-state asymmetric supercapacitors provide a maximum energy density of 58.7 Wh kg⁻¹ at a power density of 800 W kg⁻¹ and extraordinary cycling stability (71.2% retention after 10,000 cycles). These results firmly verify that the proper incorporation of oxygen vacancies into metal oxides provides a new efficient pathway to advance electrode behaviours.

尽管事实证明新兴的CuCo ₂ O ₄电极材料有望用于储能应用，但其缓慢的反应动力学和较差的电导率限制了其广泛的应用。为了解决这个具有挑战性的基本问题，本文中，使用简便的水热方法，然后在低氧气氛中进行热处理，制备了富氧空缺的CuCo ₂ O ₄纳米花。由于存在氧缺陷位点和杂质带，所以像花一样的CuCo ₂ O ₄具有大比表面积的纳米材料表现出非常优越的电导率和良好的亲水性，这对于超级电容器的应用是非常令人鼓舞的。令人印象深刻的，当作为活性电极材料评价，其表现出显着的比电容（1006 F G ^-1  1个A G ^-1，即，1.2˚F厘米^-2 在1.2毫安厘米^-2），优良的速率能力（69.4％电容保持在20 A g ^-1）和超长的循环寿命（10,000次循环后的比电容保持率是85.5％）。此外，当与活性炭配对时，准固态不对称超级电容器的最大能量密度为58.7 Wh kg ^-1 在800 W kg ^-1的功率密度下具有出色的循环稳定性（10,000次循环后保留71.2％）。这些结果坚定地证明了将氧空位适当地结合到金属氧化物中可以提供一种提高电极性能的新有效途径。