https://scholars.lib.ntu.edu.tw/handle/123456789/408542
標題: | High-performance carbon-based supercapacitors using Al current-collector with conformal carbon coating | 作者: | Wu H.-C. Lin Y.-P. Lee E. Lin W.-T. Hu J.-K. Chen H.-C. WU NAE-LIH |
關鍵字: | Chemical vapor deposition;Electrochemical properties;Microporous materials;X-ray photo-emission spectroscopy | 公開日期: | 2009 | 卷: | 117 | 期: | 1 | 起(迄)頁: | 294-300 | 來源出版物: | Materials Chemistry and Physics | 摘要: | Al current-collector with porous surface is coated with a conformal carbon (C) layer via a chemical vapor deposition process in CH4 at 600 ¢XC. X-ray photoelectron spectroscopy analysis indicates that the coating process leads to the replacement of native aluminum oxide with a composite coating consisting of an Al4C3 interfacial layer and a C top layer. Activated C-based supercapacitors employing the resulting C-coated Al current-collectors have exhibited remarkably enhanced high-rate performance, and the enhancement can be attributed to two accounts. Firstly, the current-collector/active-layer interface resistance is reduced due to removal of the insulating oxide layer and improved adhesion of the active-layer on the current-collector. Secondly, the presence of the conducting C layer shortens the effective current conduction distance from the solid-electrolyte interface to the current-collector, leading to reduced charge-transfer resistance within the active-layer. Combining the C-coated Al current-collector with a C fiber active-layer that contains a large mesoporous pore volume (0.4 cm3 g-1) has resulted in high-performance supercapacitors that exhibit, for instance, a cell specific energy of 18 Wh Kg-1 at 25 ¢XC or 7 Wh Kg-1 at -10 ¢XC under a cell specific power of 25 KW Kg-1. ? 2009 Elsevier B.V. All rights reserved. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408542 | ISSN: | 02540584 | DOI: | 10.1016/j.matchemphys.2009.06.001 |
顯示於: | 化學工程學系 |
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