Core-shell nanostructured compounds are considered as promising electrode materials for supercapacitors in virtue of their facile accessibility to active sites and high electrical conductivity, yet always limited by low capacity or poor cyclic stability because of the weak combination or shedding of active materials from the substrate. To address this issue, we first synthesize three-dimensional (3D) CuO cross-linked nanosheet aggregates grown on Cu foams (CF) by wet chemical oxidation, and further demonstrate the growth of ultra-thin cobalt-nickel layered double hydroxides (CoNi LDH) onto the core of 3D CuO cross-linked nanosheet aggregates by electrodeposition. In this way, we find that the cross-linked CuO@CoNi LDH growing on Cu foams has stronger adhesive force. The as-prepared core-shell nanohybrid (CF@CuO@CoNi LDH) is featured with a high specific capacity (319.4 mAh·g⁻¹ at 1 A·g⁻¹), excellent rate performance and long cycling stability. The as-assembled CF@CuO@CoNi LDH 1–4//RGO asymmetric supercapacitor (ASC) delivers an ultra-high energy density of 92.5 Wh·kg⁻¹ at a power density of 400 W·kg⁻¹, as well as an excellent cycling performance with capacitance retention of 83.8% after 8000 cycles at 5 A·g⁻¹. These results indicate that the cross-linked hybrid is a high-performance electrode material for supercapacitors, and could provide new insight into the synthesis of novel core-shell nanomaterials.

核-壳纳米结构化合物因其易于接近活性位点和高电导率而被认为是超级电容器的有希望的电极材料，但由于活性材料与基质的弱结合或脱落，总是被低容量或较差的循环稳定性所限制。为了解决此问题，我们首先通过湿化学氧化合成在泡沫铜（CF）上生长的三维（3D）CuO交联纳米片状纳米聚集体，并进一步证明了超薄钴镍层状双氢氧化物（CoNi LDH）的生长）通过电沉积到3D CuO交联纳米片聚集体的核上。以此方式，我们发现在铜泡沫上生长的交联的CuO @ CoNi LDH具有更强的粘合力。^-1 1个A·^克-1），优良的倍率性能和循环长稳定性。组装后的CF @ CuO @ CoNi LDH 1-4 // RGO非对称超级电容器（ASC）在功率密度为400 W·kg ^-1时可提供92.5 Wh·kg ^-1的超高能量密度，以及优异的循环性能，在5 A·g ^-1下经过8000次循环后的电容保持率为83.8％。这些结果表明，交联的杂化体是用于超级电容器的高性能电极材料，并且可以为合成新型核壳纳米材料提供新的见识。