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Synergistic effect of control parameters and morphology on synthesis and performance of the Al 2 O 3 /MWCNT composite as a promising capacitor material
Journal of Sol-Gel Science and Technology ( IF 2.5 ) Pub Date : 2019-10-23 , DOI: 10.1007/s10971-019-05158-1
G. B. Kunde , B. Sehgal , A. K. Ganguli

The functional ceramic/CNT composites were investigated using the alumina (Al2O3)/multiwall carbon nanotube (MWCNT) composite as a promising capacitor material based on its electrochemical properties, mesoporous morphology, and aligned MWCNT network. The aligned morphology of the carbon nanotubes in alumina matrix annealed at 900 °C resulted in increased surface area (609.55 m2 g−1), hardness (11 GPa), and Young’s modulus (85.88 GPa). The electrochemical properties of the Al2O3/MWCNT composite were investigated by galvanostatic charge–discharge, cyclic voltammetry, and electrochemical impedance spectroscopy measurements. The MWCNT/Al2O3 composite displays appreciable specific capacitance (183.33 F g−1), energy density (9.16 Wh kg−1), and power density (2.99 kW kg−1) with the addition of 5 wt.% MWCNT. The cycling characteristics of the electrode material show excellent stability up to 1000 charge/discharge cycles with MWCNTs playing the role of the current collector while mesoporous alumina adds to the capacitive performance of the electrode. The alignment of MWCNTs within the alumina matrix changed into accountable for the electrochemical properties of the composite. The results obtained and the ceramic film fabrication technique used in this work provide unflinching confidence that this composite material will be utilized for the fabrication of cost-effective devices for energy storage applications.



中文翻译:

控制参数和形貌对有前途的电容器材料Al 2 O 3 / MWCNT复合材料的合成和性能的协同作用

基于氧化铝(Al 2 O 3)/多壁碳纳米管(MWCNT)复合材料作为有前途的电容器材料,基于其电化学性能,介孔形态和排列的MWCNT网络,研究了功能陶瓷/ CNT复合材料。在900°C退火的氧化铝基质中碳纳米管的排列形态导致表面积(609.55 m 2  g -1),硬度(11 GPa)和杨氏模量(85.88 GPa)增加。通过恒电流充放电,循环伏安法和电化学阻抗谱测量研究了Al 2 O 3 / MWCNT复合材料的电化学性能。MWCNT / Al 2 O 3复合材料显示出可观的比电容(183.33 F g -1),能量密度(9.16 Wh kg -1)和功率密度(2.99 kW kg -1),并加入5 wt。%的MWCNT。电极材料的循环特性在高达1000个充电/放电循环中表现出出色的稳定性,其中MWCNT起到集电器的作用,而介孔氧化铝增加了电极的电容性能。MWCNT在氧化铝基体内的排列方式改变了复合材料的电化学性能。获得的结果和这项工作中使用的陶瓷膜制造技术提供了坚定的信心,即这种复合材料将被用于制造用于能量存储应用的具有成本效益的设备。

更新日期:2020-04-23
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