Zinc Cobalt Sulfide Microspheres as a High‐Performance Electrode Material for Supercapacitors,ChemistrySelect

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Zinc Cobalt Sulfide Microspheres as a High‐Performance Electrode Material for Supercapacitors
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-12-27 , DOI: 10.1002/slct.201803095
Xueyan Gao ₁ , Qin Chang ₁ , Juan Hong ₁ , Dayang Long ₁ , Guizhen Jin ₂ , Xuxian Xiao ₁

Affiliation

Fast charging/discharging rate, sustained cycle life, and high power density are irreplaceable virtues of supercapacitors (SCs), and these merits can be achieved by selecting suitable active materials and designing the rational microstructure. In this work, zinc cobalt sulfde (ZCS) microspheres have been synthesized by a simple two‐step method involving an ethylene glycol (EG) mediated solvothermal approach and subsequent sulfidation treatment. The formation mechanism of the microspheres is also proposed in detail by analyzing the time‐dependent SEM observations. Compared to ZCS nanosheets, ZCS microspheres achieve better electrochemical storage performance due to their satisfactory mesoporous feature, conductivity, and effective transport/diffusion paths for ions and electrons. When used as the electrode material of supercapacitor, ZCS microspheres not only obtain a large specific capacitance of 1516 F g⁻¹ (211 mAh g⁻¹) at 1 A g⁻¹ with good rate capability of 1080 F g⁻¹ (150 mAh g⁻¹) at 10 A g⁻¹, but also exhibit exceptional cycling stability with a capacitance reduced 6% of the initial specific capacitance at 10 A g⁻¹ after 4000 cycles. An asymmetric supercapacitor using ZCS microspheres as the cathode and activated carbon (AC) as the anode is assembled, which achieves high specific capacitance (489.3 F g⁻¹), energy density (152.9 Wh kg⁻¹), and power density (750 W kg⁻¹) at 1 A g⁻¹ with the capacitance retention of 79% at 5 A g⁻¹ after 2000 cycles. This work illustrates the promising application potential of the ZCS microspheres as the electrode material for electrochemical capacitors.

中文翻译：

硫化锌钴微球作为超级电容器的高性能电极材料

快速的充电/放电速率，持续的循环寿命和高功率密度是超级电容器（SC）不可替代的优点，而这些优点可以通过选择合适的活性材料并设计合理的微观结构来实现。在这项工作中，硫化锌钴（ZCS）微球是通过简单的两步法合成的，该方法涉及乙二醇（EG）介导的溶剂热法和随后的硫化处理。通过分析时间相关的SEM观察结果，还详细提出了微球的形成机理。与ZCS纳米片相比，ZCS微球具有令人满意的介孔特性，电导率以及有效的离子和电子传输/扩散路径，因此电化学存储性能更好。当用作超级电容器的电极材料时，^-1（211毫安克^-1）1 A G ^-1与1080 F G良好倍率性能^-1（150毫安克^-1以10 A G）^-1，但也表现出与电容特殊循环稳定性降低6 4000次循环后，在10 A g ^-1时的初始比电容的％。组装了使用ZCS微球作为阴极并使用活性炭（AC）作为阳极的不对称超级电容器，从而实现了高比电容（489.3 F g ^-1），能量密度（152.9 Wh kg ^-1）和功率密度（750 W kg ^-1）在1 A g ^-1时，电容保持率在5 A g ^-1时为79％在2000个周期后。这项工作说明了ZCS微球作为电化学电容器的电极材料具有广阔的应用前景。

更新日期：2018-12-27

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