Ni(OH)₂-based composites are promising electrode materials for high-performance hybrid supercapacitors due to their high theoretical specific capacity and unique nanostructures. Unfortunately, most regular Ni(OH)₂-based electrodes can deliver much lower specific capacity in comparison with the theoretical value and exhibit poor rate capability and cycling stability due to the low electrical conductivity and large volume variation. Herein, we present a facile chemical precipitation method to fabricate a hierarchical core-shell nanocomposite of hollow mesoporous carbon spheres enwrapped Ni(OH)₂ nanosheets. The Ni(OH)₂ nanosheets possess unique small-sized and ultrathin morphology, which endues the resulting nanocomposite with a large specific surface area (481.64 m² g⁻¹) and good conductivity, thus giving a high specific capacity of 844 C g⁻¹ at a current density of 1 A g⁻¹ with excellent cycling stability and superior rate capability. Furthermore, a hybrid supercapacitor is constructed which presents a high energy density of 45.84 Wh kg⁻¹ at a power density of 799 W kg⁻¹ and delivers an excellent cycling stability of capacitance retention rate of 91.4% after 10,000 cycles at 10 A g⁻¹, demonstrating potential application for high-performance hybrid supercapacitor.

基于Ni（OH）₂的复合材料具有很高的理论比容量和独特的纳米结构，是用于高性能混合超级电容器的有前途的电极材料。不幸的是，由于低电导率和大体积变化，大多数常规的基于Ni（OH）₂的电极可提供比理论值低得多的比电容，并且表现出差的倍率能力和循环稳定性。在这里，我们提出了一种简便的化学沉淀方法来制造空心的介孔碳球包裹的Ni（OH）₂纳米片的分层的核-壳纳米复合材料。Ni（OH）₂纳米片具有独特的小尺寸和超薄形态，这使所得的纳米复合材料具有较大的比表面积（481.64 m ²  g ^-1）和良好的导电性，因此在电流密度为340 C g ^-1时具有高比容量。 1 A g ^-1具有出色的循环稳定性和出色的倍率能力。此外，构造了一种混合超级电容器，该超级电容器在799 W kg ^-1的功率密度下具有45.84 Wh kg ^-1的高能量密度，并且在10 A g-下经过10,000次循环后具有91.4％的出色的循环稳定性，电容保持率为91.4％^{。参考图1}，展示了高性能混合超级电容器的潜在应用。