One step synthesis of SnS2-SnO2 nano-heterostructured as an electrode material for supercapacitor applications
One step synthesis of SnS2-SnO2 nano-heterostructured as an electrode material for supercapacitor applications
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DOI：
10.1016/j.jallcom.2018.12.176
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发表时间：
2019-04-25
影响因子：
6.2
通讯作者：
Taghavinia, Nima
中科院分区：
文献类型：
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作者：
Asen, Parvin;Haghighi, Maryam;Taghavinia, Nima
以硫代乙酰胺（TAA）和硫脲（TU）为前驱体，在不同溶剂比（SR）的乙醇和水条件下，采用简单、经济、可扩展、经济高效的溶剂热法合成了SnS2-SnO2纳米异质结构。用x射线衍射（XRD）、场发射扫描电镜（FE-SEM）、能量色散x射线能谱（EDX）和布鲁诺尔-埃米特-泰勒（BET）技术对所得产物进行了表征。研究发现，不同的前驱体和不同的SR值会影响所制备的纳米结构的组成和形貌，从而导致所制备电极的电容行为发生变化。采用循环伏安法、恒流充放电法和电化学阻抗法在三电极体系中研究了所制备纳米结构的电化学性能。TAA和TU在SR值为0.7时获得的SnS2-SnO2纳米异质结构在2 Ag-1电流密度下的比电容分别为149.0和71.4 Fg（-1）。此外，利用上述SR值下的TAA和TU合成的SnS2-SnO2纳米异质结构可以成功地用于组装对称超级电容器器件。在双电极体系中，当电流密度为2ag -1时，TAA和TU在SR = 0.7条件下制备的SnS2-SnO2样品的比电容分别为70.2和31.5 Fg（-1）。此外，TAA和TU合成的SnS2-SnO2对称超级电容器在3000次恒流充放电循环后，电容保持率分别为92%和90%。良好的电化学性能可归因于SnS2-SnO2纳米异质结构的适当组成和多孔结构。(C) 2018 Elsevier B.V.版权所有
SnS2-SnO2 nano-heterostructures are synthesized with two different precursors of thioacetamide (TAA) and thiourea (TU) at various solvent ratios (SR) of ethanol and water by using a facile, economical, scalable, and cost-effective solvothermal method. The obtained products have been characterized by Xray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer-Emmet-Teller (BET) techniques. It is found that different precursors and various SR values have an influence on the composition and morphologies of the prepared nanostructures, leading to variation in capacitive behavior of the fabricated electrodes. Electrochemical properties of the prepared nanostructures are investigated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy in a three-electrode system. The obtained SnS2-SnO2 nano-heterostructures from TAA and TU in a SR value of 0.7 deliver a specific capacitance of 149.0 and 71.4 Fg(-1) at an applied current density of 2 Ag-1, respectively. Furthermore, SnS2-SnO2 nano-heterostructures synthesized with TAA and TU in the mentioned value of SR can be successfully applied to assemble a symmetric supercapacitor device. The specific capacitances of 70.2 and 31.5 Fg(-1) are obtained for the SnS2-SnO2 samples prepared using TAA and TU in SR = 0.7, respectively, at a current density of 2 Ag-1 in the two-electrode system. Additionally, symmetrical supercapacitors obtained from SnS2-SnO2 synthesized with TAA and TU exhibit capacitance retention of 92 and 90% after 3000 galvanostatic charge-discharge cycles, respectively. Good electrochemical performances can be attributed to the appropriate composition and porous structure of the SnS2-SnO2 nano-heterostructures. (C) 2018 Elsevier B.V. All rights reserved.