Carbon nanotubes/cobalt sulfide composites as potential high-rate and high-efficiency supercapacitors
Carbon nanotubes/cobalt sulfide composites as potential high-rate and high-efficiency supercapacitors
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DOI：
10.1016/j.jpowsour.2012.04.075
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发表时间：
2012-10-01
影响因子：
9.2
通讯作者：
Chang, Huan-Tsung
中科院分区：
文献类型：
--
作者：
Chen, Chia-Ying;Shih, Zih-Yu;Chang, Huan-Tsung
以硝酸钴、硫代乙酰胺和碳纳米管为原料，在聚乙烯吡咯烷酮存在下，制备了碳纳米管/硫化钴复合材料。将CNT/CoS复合材料沉积到氟掺杂的氧化锡玻璃衬底上，然后在300 ℃下进行0.5小时的简单退火以制造CNT/CoS电极。从拉曼光谱，X射线光电子能谱，高分辨率透射电子显微镜，和d-间距收集的数据揭示了退火后的CoS结构和晶格的变化。循环伏安法结果显示，退火CNT/CoS复合电极在10和100 mV s（-1）的扫描速率下分别产生2140 +/- 90和1370 +/- 50 F g（-1）的比电容值。据我们所知，退火的CNT/CoS复合电极在100 mV s（-1）的扫描速率下提供了相对于其他报道的电极更高的比电容。CNT/CoS复合电极在217.4 A g（-1）的恒定放电电流密度下产生62.4 kW kg（-1）的功率密度。具有如此高的容量和功率密度。CNT/CoS复合材料超级电容器作为高效的储能器件显示出巨大的潜力。皇冠版权所有（C）2012由爱思唯尔出版。All rights reserved.
We have prepared carbon nanotube (CNT)/cobalt sulfide (CoS) composites from cobalt nitrate, thioacetamide, and CNTs in the presence of poly(vinylpyrrolidone). CNT/CoS composites are deposited onto fluorine-doped tin oxide glass substrates and then subjected to simple annealing at 300 degrees C for 0.5 h to fabricate CNT/CoS electrodes. Data collected from Raman spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and d-spacing reveal the changes in the CoS structures and crystalline lattices after annealing. Cyclic voltammetry results reveal that the annealed CNT/CoS composite electrodes yield values of 2140 +/- 90 and 1370 +/- 50 F g(-1) for specific capacitance at scan rates of 10 and 100 mV s(-1), respectively. To the best of our knowledge, the annealed CNT/CoS composite electrodes provide higher specific capacitance relative to other reported ones at a scan rate of 100 mV s(-1). CNT/CoS composite electrodes yield a power density of 62.4 kW kg(-1) at a constant discharge current density of 217.4 A g(-1). With such a high-rate capacity and power density. CNT/CoS composite supercapacitors demonstrate great potential as efficient energy storage devices. Crown Copyright (C) 2012 Published by Elsevier By. All rights reserved.