In this reported work, polypyrrole (PPy)@cobalt phosphide (CoP) core–shell heterogeneous nanostructures (CSHNs) are grown directly on the Ni foam using a two-step electrochemical synthesis method. The morphology and microstructure analysis reveal that PPy nanowires are uniformly wrapped by intercrossing CoP nanoflakes, which endows the CSHNs with abundant electroactive sites, high electrical conductivity, and good structural stability. Electrochemical studies show that the PPy@CoP CSHNs as supercapacitor (SC) electrodes demonstrate a higher specific capacity (443C g⁻¹ at 1 A g⁻¹) and better cycling performance (93% initial capacity retention after 5000 cycles at 5 A g⁻¹) than the pure PPy and CoP electrodes. Besides, a hybrid supercapcitor (HSC) device with the PPy@CoP positive electrode yields a high energy density of 38.1 Wh kg⁻¹ at a power density of 750 W kg⁻¹. This work offer a new insight into the rational design of the heterostructures based on PPy and metal phosphides for application in high-performance SCs.

在这项报道的工作中，聚吡咯（PPy）@磷化钴（CoP）核壳异质纳米结构（CSHNs）使用两步电化学合成方法直接生长在泡沫镍上。形貌和微观结构分析表明，PPy纳米线被交叉的CoP纳米薄片均匀包裹，使CSHNs具有丰富的电活性位点、高导电性和良好的结构稳定性。电化学研究表明，PPy@CoP CSHNs 作为超级电容器 (SC) 电极表现出更高的比容量（443C g ^-1 at 1 A g ^-1）和更好的循环性能（5 A g ^- 5000 次循环后初始容量保持率为 93% ^{- 1}) 比纯 PPy 和 CoP 电极。此外，具有PPy@CoP正极的混合超级电容器（HSC）装置在750 W kg ^-1的功率密度下产生38.1 Wh kg ^-1的高能量密度。这项工作为基于 PPy 和金属磷化物的异质结构合理设计用于高性能 SCs 提供了新的见解。