Nickel oxide (NiO) is a promising electrode material in supercapacitor (SC) applications, but the poor electronic conductivity and weak electrochemical stability of NiO limits the fast charge/discharge rate and long-time reuse. Herein we report a core-shell nanostructure formed by NiO nanoparticles decorated on polypyrrole nanotube (PNT) through a chitosan (CS) layer (NiO/CS-PNT), as a supercapacitor electrode material. The PNT is synthesised using a self-degradable soft-template approach. The one dimensional (1D) nanotube structure gives increased surface area to polypyrrole (PPy). The inevitable aggregation of the NiO nanoparticles is reduced by the incorporation of CS, thereby increasing the surface area of the active material and bringing the higher electrochemical performance. NiO/CS-PNT core-shell nanostructure is found to have a large surface area, low charge transfer resistance (R_ct) and high specific capacitance (C_sp) as compared with that of NiO/PNT and pure PNT. Besides, an all-solid-state symmetric supercapacitor (SSC) was fabricated with NiO/CS-PNT as positive and negative electrode, which shows high power density (PD) of 4045.69 Wkg⁻¹ at an energy density (ED) of 27.80 Wh Kg⁻¹. Also, an outstanding cyclic stability was found with capacitance retention of 84.90% even after 10,000 cycles. The results demonstrate that the NiO/CS-PNT core-shell nanostructure is a favourable electrode material for supercapacitors.

氧化镍（NiO）是超级电容器（SC）应用中有希望的电极材料，但NiO的较差的电子电导率和较弱的电化学稳定性限制了其快速的充电/放电速率和长时间的重复使用。本文中，我们报告了一种由NiO纳米粒子形成的核壳纳米结构，该纳米粒子通过壳聚糖（CS）层（NiO / CS-PNT）装饰在聚吡咯纳米管（PNT）上，作为超级电容器电极材料。使用可自降解的软模板方法合成PNT。一维（1D）纳米管结构使聚吡咯（PPy）的表面积增加。通过引入CS减少了NiO纳米颗粒不可避免的聚集，从而增加了活性材料的表面积并带来了更高的电化学性能。_CT）和高的比电容（C _SP），为与氧化镍/ PNT和纯PNT的比较。此外，以NiO / CS-PNT为正极和负极制备了全固态对称超级电容器（SSC），其在27.80 Wh的能量密度下显示出4045.69 Wkg ^-1的高功率密度（PD）。千克^-1。此外，即使在10,000次循环后，仍具有出色的循环稳定性和84.90％的电容保持率。结果表明，NiO / CS-PNT核-壳纳米结构是超级电容器的理想电极材料。