標題: | Fabrication of CNTs with controlled diameters and their applications as electrocatalyst supports for DMFC |
作者: | Lo, An-Ya Yu, Ningya Huang, Shing-Jong Hung, Chin-Te Liu, Shou-Heng Lei, Zhibin Kuo, Cheng-Tzu Liu, Shang-Bin 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Carbon nanotube;Templating synthesis;Chemical vapor deposition;Hexagonal mesoporous silica;Electrocatalyst;Direct methanol fuel cell |
公開日期: | 1-三月-2011 |
摘要: | A facile synthesis procedure based on chemical vapor deposition (CVD) process has been developed to fabricate carbon nanotubes (CNTs) with controlled diameters and high yields utilizing Fe-containing ordered hexagonal mesoporous silicas (HMSs) such as MCM-41 and SBA-15 having varied pore sizes as the catalysts as well as the templates. It is found that unlike Fe/HMS catalysts prepared by co-precipitation method, samples prepared by the impregnation method gave rise to multi-wall CNTs with uniform diameters, which were largely dictated by the pore size of the Fe/HMS catalysts. Among these uniform MWCNTs, sample with a larger diameter (>= 8 nm) was found to be more favorable as support for Pt catalyst, leading to a homogeneous dispersion of metal nanoparticles. Consequently, the Pt/CNT electrocatalysts so prepared gave rise to superior methanol oxidation activities as well as tolerances for CO poisoning compared to Pt supported on commercial single-wall CNT (Pt/SWCNT) and XC-72 activated carbon (Pt/XC-72) having a similar metal loading. (c) 2011 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.diamond.2011.01.002 http://hdl.handle.net/11536/352 |
ISSN: | 0925-9635 |
DOI: | 10.1016/j.diamond.2011.01.002 |
期刊: | DIAMOND AND RELATED MATERIALS |
Volume: | 20 |
Issue: | 3 |
起始頁: | 343 |
結束頁: | 350 |
顯示於類別: | 會議論文 |