In this paper, the Ni[Formula: see text]Co[Formula: see text]S4@CNTs nanocomposites containing different carbon nanotubes (CNT) content were prepared by a one-step hydrothermal method. More hydroxyl and carboxyl groups were introduced on the surface of CNTs by acidizing treatment to increase the dispersion of CNTs. The acid-treated CNTs can more fully compound with Ni[Formula: see text]Co[Formula: see text]S4 nanoparticles to form heterostructure. When the CNTs content is 10[Formula: see text]wt.%, the Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 nanocomposite exhibits the highest specific capacity of 210[Formula: see text]mAh[Formula: see text]g[Formula: see text] in KOH aqueous electrolytes at current density of 1[Formula: see text]A[Formula: see text]g[Formula: see text]. The superior performances of the Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 nanocomposite are attributed to the effective synergic effects of the high specific capacity of Ni[Formula: see text]Co[Formula: see text]S4 and the excellent conductivity of CNTs. An asymmetric supercapacitor (ASC) was assembled based on Ni[Formula: see text]Co[Formula: see text]S4@CNTs-10 positive electrode and activated carbon (AC) negative electrode, which delivers a high energy density of 61.2[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at a power density of 800[Formula: see text]W[Formula: see text]kg[Formula: see text], and maintains 34.8[Formula: see text]Wh[Formula: see text]kg[Formula: see text] at a power density of 16079[Formula: see text]W[Formula: see text]kg[Formula: see text]. Also, the ASC device shows an excellent cycling stability with 91.49% capacity retention and above 94% Columbic efficiency after 10 000 cycles at 10[Formula: see text]A[Formula: see text]g[Formula: see text]. This aqueous asymmetric Ni[Formula: see text]Co[Formula: see text]S4@CNTs//AC supercapacitor is promising for practical applications due to its advantages such as high energy density, power delivery and cycling stability.

中文翻译：

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基于 Ni1.5Co1.5S4@CNTs 纳米复合材料的高性能非对称超级电容器

在本文中，Ni[公式：见正文]Co[公式：见正文]S4通过一步水热法制备含有不同碳纳米管（CNT）含量的@CNTs纳米复合材料。通过酸化处理在碳纳米管表面引入更多的羟基和羧基，以增加碳纳米管的分散度。酸处理后的碳纳米管可以更充分地与Ni[分子式：见正文]Co[分子式：见正文]S复合4纳米颗粒形成异质结构。当CNTs含量为10[公式：见文]wt.%时，Ni[公式：见文]Co[公式：见文]S4@CNTs-10 纳米复合材料在电流密度为 1[公式：见文本]A[公式: 见正文]g[公式：见正文]。Ni[公式：见正文]Co[公式：见正文]S的优越性能4@CNTs-10纳米复合材料归因于Ni的高比容量的有效协同作用[分子式：见正文]Co[分子式：见正文]S4以及碳纳米管的优良导电性。基于Ni[公式：见正文]Co[公式：见正文]S组装了非对称超级电容器（ASC）4@CNTs-10 正极和活性炭 (AC) 负极，在功率密度为 800[公式：见文]W[公式：见文]kg[公式：见文]，并保持34.8[公式：见文]Wh[公式：见文]kg[公式：见文]功率密度为16079[公式：见正文]W[公式：见正文]kg[公式：见正文]。此外，ASC 器件在 10[公式：见文本]A[公式：见文本]g[公式：见文本]下 10 000 次循环后表现出优异的循环稳定性，容量保持率为 91.49%，库伦比效率高于 94%。这种水性不对称Ni[分子式：见正文]Co[分子式：见正文]S4@CNTs//交流超级电容器由于其高能量密度、功率传输和循环稳定性等优点，在实际应用中很有前景。