A facile method of directly growing NiCo₂O₄ hybrid hierarchical nanostructures on nickel foam is developed by a hydrothermal and post heat-treatment method without using any surfactant, stabilizer or organic binder. Due to the rich porous nanostructures, relative large specific surface area (177.71 m² g⁻¹) of the NiCo₂O₄ hybrid structure and efficient electrical contact with the conductive nickel substrate, the NiCo₂O₄NF hybrid electrode shows significantly enhanced specific capacitance (3105.1 F g⁻¹ at 1 A g⁻¹), outstanding rate properties (1621.3 F g⁻¹ at 20 A g⁻¹ and 1191.5 F g⁻¹ at 50 A g⁻¹) and high energy density (95.26 Wh kg⁻¹). This facile and effective design method opens up new possibilities for producing binder-free electrodes in high-performance electrochemical supercapacitors and miniaturized devices.

通过水热和后热处理方法开发了一种在镍泡沫上直接生长NiCo ₂ O ₄杂化分层纳米结构的简便方法，而无需使用任何表面活性剂，稳定剂或有机粘合剂。由于具有丰富的多孔纳米结构，相对较大的NiCo ₂ O ₄杂化结构的比表面积（177.71 m ²  g ^-1）以及与导电镍基板的有效电接触，NiCo ₂ O ₄ NF杂化电极显示出明显提高的比表面积电容（3105.1 F G ^-1 1 A G ^-1），突出的速率特性（1621.3 F G ^-1在20 A g ^-1下为1191.5 F g ^-1在50 A g ^-1时）和高能量密度（95.26 Wh kg ^-1）。这种简便有效的设计方法为在高性能电化学超级电容器和小型化设备中生产无粘合剂电极开辟了新的可能性。