Cobalt-based metal oxide coated with ultrathin ALD-MoS2 as an electrode material for supercapacitors
Cobalt-based metal oxide coated with ultrathin ALD-MoS2 as an electrode material for supercapacitors
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DOI：
10.1016/j.cej.2022.135066
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发表时间：
2022-02
影响因子：
15.1
通讯作者：
S. Pawar;D. Patil;D. Nandi;Muhammad Monirul Islam;T. Sakurai;Soo‐Hyun Kim;Jae Cheol Shin
中科院分区：
文献类型：
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作者：
S. Pawar;D. Patil;D. Nandi;Muhammad Monirul Islam;T. Sakurai;Soo‐Hyun Kim;Jae Cheol Shin
提出了一种制备由过渡金属硫化物修饰的三元金属氧化物纳米结构组成的复合超级电容器电极的新方法。采用原子层沉积法（ALD）在泡沫镍上制备了高比表面积的NiCo 2 O 4纳米片，并在其表面包覆一层MoS 2，这种复合结构显示出上级的电化学性能.采用XRD、拉曼、XPS、SEM和TEM等手段对复合材料进行了表征。与MoS 2涂覆的Co 3 O 4电极的比较研究不仅确保了更导电的硫化物层在显著增强超级电容器性能方面的优势，而且还确立了三元氧化物（NiCo 2 O 4）在该应用中的优越性。NiCo 2 O 4的更薄和连接良好的纳米片提供了电极和电解质之间更多的界面，而MoS 2的最佳厚度有助于最大限度地提高器件的性能。因此，优化的NiCo 2 O 4-MoS 2复合物的高面电容（2445 mF cm-2）、增强的倍率性能归因于氧化物纳米片的高表面积和硫化物的更好的电子导电性的协同效应。因此，目前的研究开辟了一条路线，将三元氧化物纳米结构的常规水热合成与ALD生长的层状过渡金属二硫属化物相结合，以实现下一代超级电容器的上级电极。
A novel approach of preparing a composite supercapacitor electrode consisting of ternary metal oxide nanostructure decorated with transition metal sulfide is presented. High-surface area NiCo2O4nano-sheets grown on Ni-foam are coated with an ultrathin layer of MoS2by atomic layer deposition (ALD) and the hybrid structure reveals superior electrochemical performance. The composite is thoroughly studied with several characterizations like XRD, Raman, XPS, SEM and TEM. A comparative study with MoS2coated Co3O4electrodes not only ensures the advantage of the more conducting sulfide layer in enhancing the supercapacitor performance significantly but also establishes the superiority of the ternary oxide (NiCo2O4) for this application. The thinner and well-connected nano-sheets of NiCo2O4provides the more interface between the electrode and the electrolyte whereas an optimal thickness of MoS2helps to maximize the performance of the device. The high areal capacitance (2445 mF cm−2), enhanced rate capability of the optimized NiCo2O4-MoS2composite is therefore ascribed to the synergistic effect of high-surface area of the oxide nano-sheets and better electronic conductivity of the sulfide. The current study thus opens a route to combine the conventional hydrothermal synthesis of ternary oxide nanostructures with ALD grown layered transition metal dichalcogenides to achieve a superior electrode for next-generation supercapacitor.