Abstract In this study, a composite structure based on NiCo2O4/CdS was synthesized on nickel foam using hydrothermal and chemical bath deposition (CBD) methods. An ultrathin nanosheet of NiCo2O4 was coated by CdS nanocrystals by varying the CBD reaction time. Synergistic effects arising from the NiCo2O4 nanosheets and CdS nanocrystals were studied for prospective electrochemical energy storage applications. The NiCo2O4/CdS composite electrode with optimized CBD reaction time of CdS coating exhibited a high specific capacity of 331 mAh g−1 at 30 mA, which is higher than pristine NiCo2O4 (260 mAh g−1). In addition, for practical applications, we fabricated an asymmetric cell based on the NiCo2O4/CdS as positive electrode and activated carbon as negative electrode and its electrochemical performance was studied in detail. This work provides a foundation for different metal-oxide- and metal-sulfide-based composite electrodes for energy storage studies.

中文翻译：

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基于钴酸镍和硫化镉复合结构增强电池型超​​级电容器性能

摘要 在本研究中，采用水热和化学浴沉积 (CBD) 方法在泡沫镍上合成了基于 NiCo2O4/CdS 的复合结构。通过改变 CBD 反应时间，用 CdS 纳米晶体涂覆 NiCo2O4 的超薄纳米片。研究了 NiCo2O4 纳米片和 CdS 纳米晶体产生的协同效应，用于预期的电化学储能应用。具有优化的 CdS 涂层 CBD 反应时间的 NiCo2O4/CdS 复合电极在 30 mA 时表现出 331 mAh g-1 的高比容量，高于原始 NiCo2O4 (260 mAh g-1)。此外，在实际应用中，我们制作了以 NiCo2O4/CdS 为正极，活性炭为负极的非对称电池，并对其电化学性能进行了详细研究。