Three dimensional solid-state supercapacitors from aligned single-walled carbon nanotube array templates

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• 作者：Cary L. Pint^a ; ^c ; ¹ ; ^{cary.l.pint@intel.com"" rel=""nofollow} ; Nolan W. Nicholas^a ; ^c ; ¹ ; Sheng Xu^d ; Zhengzong Sun^b ; ^c ; James M. Tour^b ; ^c ; Howard K. Schmidt^c ; Roy G. Gordon^d ; Robert H. Hauge^b ; ^c ; ^{hauge@rice.edu"" rel=""nofollow}
• 刊名：Carbon
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：49
• 期：14
• 页码：4890-4897
• 全文大小：1381 K

文摘

We demonstrate the fabrication of solid-state dielectric energy storage materials from self-assembled, aligned single-walled carbon nanotube arrays (VA-SWNTs). The arrays are transferred as intact structures to a conductive substrate and the nanotubes are conformally coated with a thin metal-oxide dielectric and a conductive counter-electrode layer using atomic layer deposition. Experimental results yield values in agreement with those obtained through capacitive modeling using Al₂O₃ dielectric coatings (C > 20 mF/cm³), and the solid-state dielectric architecture enables the operation of these devices at substantially higher frequencies than conventional electrolyte-based capacitor designs. Furthermore, modeling of supercapacitor architectures utilizing other dielectric layers suggests the ability to achieve energy densities above 10 W h/kg while still exhibiting power densities comparable to conventional solid-state capacitor devices. This device design efficiently converts the high surface area available in the conductive VA-SWNT electrode to space for energy storage while boasting a robust solid-state material framework that is versatile for use in a range of conditions not practical with current energy storage technology.