The design and preparation of an efficient electrode material with a multifunctional surface structure is a key challenge for high-performance supercapacitors. In this study, ZnO/NiS and ZnO/NiS/CNT nanocomposites were synthesized on a nickel foam substrate and used as an electrode material. The surface morphology and structure of the electrodes were analyzed by field emission–scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The prepared nanocomposite of ZnO/NiS/CNT exhibited a high specific capacitance of 879.0 F g at a current density of 1.5 A g, along with remarkable cycling stability of 89.7% capacitance retention after 5000 cycles, which was superior to that of ZnO/NiS (805.75 F g and 74.59% retention). In addition, the ZnO/NiS/CNT electrode also exhibited good rate capability, faster ion and electron transfer ability, and higher surface area, highlighting its potential for electrochemical energy storage.

中文翻译：

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ZnO/NiS复合材料上碳纳米管的合成作为高性能超级电容器的先进电极材料

设计和制备具有多功能表面结构的高效电极材料是高性能超级电容器的关键挑战。本研究在泡沫镍基底上合成了 ZnO/NiS 和 ZnO/NiS/CNT 纳米复合材料，并将其用作电极材料。通过场发射扫描电子显微镜、透射电子显微镜、X射线衍射和X射线光电子能谱分析电极的表面形貌和结构。所制备的ZnO/NiS/CNT纳米复合材料在1.5 A g的电流密度下表现出879.0 F g的高比电容，并且在5000次循环后具有89.7%的电容保持率，优于ZnO/NiS的循环稳定性（805.75 F g 和 74.59% 保留率）。此外，ZnO/NiS/CNT电极还表现出良好的倍率性能、更快的离子和电子传输能力以及更高的表面积，凸显了其电化学储能的潜力。