Wu H.-C.Lin Y.-P.Lee E.Lin W.-T.Hu J.-K.Chen H.-C.WU NAE-LIH2019-05-152019-05-15200902540584https://scholars.lib.ntu.edu.tw/handle/123456789/408542Al 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.Chemical vapor depositionElectrochemical propertiesMicroporous materialsX-ray photo-emission spectroscopyjournal article10.1016/j.matchemphys.2009.06.0012-s2.0-67650236114https://www.scopus.com/inward/record.uri?eid=2-s2.0-67650236114&doi=10.1016%2fj.matchemphys.2009.06.001&partnerID=40&md5=d2c65a09b97200d3030e5408eab14c24