One-dimensional (1D) nanostructure exhibits excellent electrochemical performance because of their unique physico-chemical properties like fast electron transfer, good rate capability, and cyclic stability. In the present study, Co₃(PO₄)₂ 1D nanograsses are grown on Ni foam using a simple and eco-friendly hydrothermal technique with different reaction times. The open space with uniform nanograsses displays a high areal capacitance, rate capability, energy density, and cyclic stability due to the nanostructure enhancing fast ion and material interactions. Ex-situ microscope images confirm the dependence of structural stability on the reaction time, and the nanograsses promoted ion interaction through material. Further, the reproducibility of the electrochemical performance confirms the binder-free Co₃(PO₄)₂ 1D nanograsses to be a suitable high-performance cathode material for application to hybrid supercapacitor. Finally, the assembled hybrid supercapacitor exhibits a high energy density (26.66 Wh kg⁻¹ at 750 W kg⁻¹) and longer lifetimes (80% retained capacitance after 6000 cycles). Our results suggests that the Co₃(PO₄)₂ 1D nanograss design have a great promise for application to hybrid supercapacitor.

一维（1D）纳米结构具有出色的电化学性能，因为它们具有独特的物理化学特性，例如快速的电子传输，良好的速率能力和循环稳定性。在本研究中，Co ₃（PO ₄）₂一维纳米草通过一种简单，环保的水热技术在不同的反应时间下在镍泡沫上生长。由于纳米结构增强了离子和材料之间的快速相互作用，具有均匀纳米草的开放空间显示出高的面电容，速率能力，能量密度和循环稳定性。异位显微镜图像证实了结构稳定性对反应时间的依赖性，并且纳米草通过材料促进了离子相互作用。此外，电化学性能的可重复性证实了无粘结剂的Co ₃（PO ₄）₂一维纳米草是适合应用于混合超级电容器的高性能阴极材料。最后，组装的混合超级电容器表现出高的能量密度（瓦26.66千克^-1在750瓦千克^-1）和更长的寿命（80％6000次循环后保持电容）。我们的结果表明，Co ₃（PO ₄）₂ 1D纳米草设计在混合超级电容器中具有广阔的应用前景。