It is very desirable to develop the high-performance supercapacitors to meet the rapidly growing demands for energy-autonomous operation and miniaturization of devices. Herein, comb-like porous NiCo₂O₄ nanoneedles on the three-dimension (3D) nickel foam (NF) have been successfully synthesized through a facile pulsed laser ablation (PLA) approach without any post-treatments and surfactant (denoted as NiCo₂O₄-PLA). The influence of working solution during the fabricated process on the properties of NiCo₂O₄-PLA has been demonstrated in detail in terms of the crystalline structure, specific surface area, morphology, and electrochemical performance. Benefiting from the large specific surface (261.4 m² g⁻¹), abundant pores, and highly conductive scaffold, the NiCo₂O₄-PLA binder-free electrode exhibits an outstanding specific capacitance (1650 F g⁻¹ at a current density of 1 A g⁻¹) and eminent cycling performance (91.78% retention after a 12,000-cycle test at a current density of 10 A g⁻¹) compared with the control samples. The assembled asymmetric device (NiCo₂O₄-PLA//AC-ASCs) delivers the high specific capacitance of 126.9 F g⁻¹ at the current density of 1 A g⁻¹, the large energy density of 56.7 Wh kg⁻¹ at a power density of 756 W kg⁻¹, and the low internal resistance. The attractive results strongly prove that it is an ideal candidate for advanced supercapacitor application.

非常需要开发高性能超级电容器，以满足对能量自动运行和设备小型化迅速增长的需求。本文中，通过简便的脉冲激光烧蚀（PLA）方法成功地合成了三维（3D）泡沫镍（NF）上的梳状多孔NiCo ₂ O ₄纳米针，无需进行任何后处理和表面活性剂（表示为NiCo ₂ O ₄ -PLA）。加工过程中工作溶液对NiCo ₂ O ₄性能的影响-PLA已在晶体结构，比表面积，形态和电化学性能方面得到了详细证明。NiCo ₂ O ₄ -PLA无粘合剂电极受益于比表面积大（261.4 m ²  g ^-1），丰富的孔和高导电性的支架，在电流密度为1650 F g ^-1时表现出出色的比电容。与对照样品相比，具有1 A g ^-1）和出色的循环性能（在12,000个循环的测试下，在10 A g ^-1的电流密度下保留91.78％）。组装后的不对称装置（NiCo ₂ O ₄-PLA // AC-ASCs）在1 A g ^-1的电流密度下可提供126.9 F g ^-1的高比电容，在756 W kg ^-1的功率密度下可提供56.7 Wh kg ^-1的大能量密度，内部电阻低。诱人的结果有力地证明了它是高级超级电容器应用的理想选择。