Three-Dimensional Polypyrrole-Decorated CuCo 2 S 4 Nanowires Anchored on Nickel Foam: A Promising Electrode for High-Performance Supercapacitors

作者：Qingfeng Wu, Yuhao Zhang, Yuan Lin, Wei Wei, Guo Liu, Xiaosha Cui, Meixia Su, Haiqing Jiang, Tianyu Wu, Xijuan Li, Xueliang Lv, Kun Tao, Erqing Xie, Zhenxing Zhang · 发表于：ACS Applied Materials & Interfaces · 年份：2023 · DOI：10.1021/acsami.3c09922 · 被引用次数：28 · 研究领域：Supercapacitor Materials and Fabrication、Advanced battery technologies research、Conducting polymers and applications

The exploitation of high-performance supercapacitors is crucial to promote energy storage technologies. Benefiting from the three-dimensional conductive micronanostructures and high specific capacity of the PPy@CuCo 2 S 4 @NF (polypyrrole/copper cobalt sulfide/nickel foam) composite electrode, this electrode exhibits a high specific capacity of 1403.21 C g –1 at 1 A g –1 and a capacitance retention of 85.79% after 10,000 cycles at 10 A g –1 . The assembled PPy@CuCo 2 S 4 @NF//AC aqueous hybrid supercapacitor (AHSC) reveals a wide operating potential window of 1.5 V and achieves a high specific capacity of 322.52 C g –1 at 1 A g –1 and a capacitance retention of 86.84% after 15,000 cycles at 10 A g –1 . The AHSC also exhibits a high power density of 733.69 W kg –1 at an energy density of 67.19 W h kg –1, surpassing those of previously reported spinel-based supercapacitors. Ex situ X-ray diffraction and X-ray photoelectron spectroscopy results show that the CuCo 2 S 4 spinel structure changes to CuS 2 and CoS 2 cube structures, and the oxidation states of Cu and Co increase during charging and discharging processes. Density functional theory calculations suggest a superior conductivity for CuCo 2 S 4 compared to that for CuCo 2 O 4, demonstrating that CuCo 2 S 4 has superior electrochemical performance. These findings attest to the considerable potential of the spinel materials for advanced energy storage applications.