Curvature effects in carbon nanomaterials: Exohedral versus endohedral supercapacitors

被引：129

作者：

Huang, Jingsong ^{[1
]}

Sumpter, Bobby G. ^{[1
]}

Meunier, Vincent ^{[1
]}

Yushin, Gleb ^{[2
]}

Portet, Cristelle ^{[3
]}

Gogotsi, Yury ^{[3
]}

机构：

[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[2] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[3] Drexel Univ, Dept Mat Sci & Engn, AJ Drexel Nanotechnol Inst, Philadelphia, PA 19104 USA

来源：

JOURNAL OF MATERIALS RESEARCH | 2010年 / 25卷 / 08期

关键词：

DOUBLE-LAYER CAPACITOR; ONION-LIKE CARBON; ELECTROCHEMICAL CAPACITORS; TRANSFER METHODOLOGY; PERFORMANCE; ULTRACAPACITORS; NANOTUBES; ELECTRODE; MODEL;

D O I：

10.1557/JMR.2010.0195

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Capacitive energy storage mechanisms in nanoporous carbon supercapacitors hinge on endohedral interactions in carbon materials with macro-, meso-, and micropores that have negative surface curvature. In this article, we show that because of the positive curvature found in zero-dimensional carbon onions or one-dimensional carbon nanotube arrays, exohedral interactions cause the normalized capacitance to increase with decreasing particle size or tube diameter, in sharp contrast to the behavior of nanoporous carbon materials. This finding is in good agreement with the trend of recent experimental data. Our analysis suggests that electrical energy storage can be improved by exploiting the highly curved surfaces of carbon nanotube arrays with diameters on the order of 1 nm.

引用

页码：1525 / 1531

页数：7

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