In this study, Ni-Al layered double hydroxide (NiAl-LDH) hollow microspheres with a high surface area and large pore volume were prepared using Al₂O₃ hollow microspheres composed of Al₂O₃ nanosheets as templates. During a mild microwave-assisted hydrothermal process, the Al₂O₃ nanosheets transformed to NiAl-LDH nanosheets without any damage to the assembled hollow spherical structure. The as-prepared NiAl-LDH hollow microspheres exhibited a high specific capacitance (1578F g⁻¹ at a current density of 1 A g⁻¹) and good cycling performance (capacitance retention of 93.75% after 10,000 cycles). Moreover, an asymmetric supercapacitor was successfully assembled using the synthesized hollow microspheres as the positive electrode and activated carbon nanofibers as the negative electrode. The supercapacitor device achieved a relatively high energy density and power density (energy densities of 20 Wh kg⁻¹ and 6.6 Wh kg⁻¹ at power densities of 0.75 kW kg⁻¹ and 11.25 kW kg⁻¹, respectively).

在这项研究中，NiAl金属层状双氢氧化物（NiAl金属-LDH）的空心微球具有高的表面积和大的孔体积以Al制备₂ ö _3个Al构成中空微球体₂ ö _3个纳米片作为模板。在温和的微波辅助水热过程中，Al ₂ O ₃纳米片转变为NiAl-LDH纳米片，而对组装的空心球形结构没有任何破坏。所制备的NiAl-LDH空心微球表现出高的比电容（1578F克^-1在1A g的电流密度^-1）和良好的循环性能（10,000次循环后的电容保持率为93.75％）。此外，以合成的空心微球为正极，活性炭纳米纤维为负极，成功组装了不对称超级电容器。超级电容器装置实现了相对较高的能量密度和功率密度（在功率密度分别为0.75 kW kg ^-1和11.25 kW kg ^-1时的能量密度分别为20 Wh kg ^-1和6.6 Wh kg ^-1）。