Fabrication of CNTs with controlled diameters and their applications as electrocatalyst supports for DMFC
Resource
DIAMOND AND RELATED MATERIALS, 20(3), 343-350
Journal
Diamond and Related Materials
Pages
343-350
Date Issued
2011
Date
2011
Author(s)
Lo, An-Ya
Yu, Ningya
Huang, Shing-Jong
Hung, Chin-Te
Liu, Shou-Heng
Lei, Zhibin
Kuo, Cheng-Tzu
Liu, Shang-Bin
Abstract
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. © 2011 Elsevier B.V. All rights reserved.
Type
journal article
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