用于超级电容器应用的分层 NiCo2S4 蜂窝/NiCo2S4 纳米片核壳结构,RSC Advances

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用于超级电容器应用的分层 NiCo2S4 蜂窝/NiCo2S4 纳米片核壳结构
RSC Advances ( IF 3.9 ) Pub Date : 2019-10-10 , DOI: 10.1039/c9ra05840k
Lemu Girma Beka ₁ , Xin Li ₁ , Xiaoli Wang ₁ , Chuanyu Han ₁ , Weihua Liu ₁

Affiliation

过渡金属硫化物正在成为一种很有前途的储能材料。特别是，对具有良好电子和离子导电性的先进电极材料结构的需求量很大。在此，报道了用于超级电容器应用的分级NiCo ₂ S ₄蜂窝/NiCo ₂ S ₄纳米片核壳结构。核壳结构通过镍泡沫原位生长两个连续的水热过程，然后是电化学沉积过程。此外，我们调整了沉积周期，以获得丰富的活性位点，在蜂窝结构的壁之间具有合适尺寸的间隙，以实现有效的电解质扩散路径。3D蜂窝芯结构用作将电子传输到集流体的高速公路，而超薄壳结构提供了较大的表面积和较短的电子和离子扩散路径，从而导致更快的动力学和更高的活性材料利用率。因此，利用核材料和壳材料的协同优势，所合成的优化电极材料在5 mA cm ^-2的电流密度下具有17.56 F cm ^{-2的优异比电容}5000 次充放电循环后的最高循环稳定性为 88.2%。这种先进的电极结构对于未来的电极材料非常有前景。

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A hierarchical NiCo2S4 honeycomb/NiCo2S4 nanosheet core–shell structure for supercapacitor applications

Transition metal sulphides are becoming one of the promising materials for energy storage applications. Particularly, an advanced electrode material architecture, which gives favourable electronic and ionic conductivity, is highly in demand. Herein, a hierarchical NiCo₂S₄ honeycomb/NiCo₂S₄ nanosheet core–shell structure is reported for supercapacitor applications. The core–shell structure was in situ grown on a nickel foam via two consecutive hydrothermal processes, followed by an electrochemical deposition process. Moreover, we tuned the deposition cycle to get abundant active sites with gaps of suitable sizes between the walls of the honeycomb structure for efficient electrolyte diffusion routes. The 3D honeycomb core structure was used as superhighway for electron transport to the current collector, while the ultrathin shell structure offered a large surface area with short electron and ion diffusion paths, thus leading to the faster kinetics and higher utilization of active materials. Thus, using the synergistic advantages of the core material and the shell material, the as-synthesized optimized electrode material came up with an excellent specific capacitance of 17.56 F cm⁻² at a current density of 5 mA cm⁻² and the highest cycling stability of 88.2% after 5000 cycles of charge–discharge process. Such advanced electrode architectures are highly promising for the future electrode materials.

更新日期：2019-10-10

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