Browsing by Author "Huang, Shing-Jong"

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Fabrication of CNTs with controlled diameters and their applications as electrocatalyst supports for DMFC
(2011-03-01)
Lo, An-Ya
;
Yu, Ningya
;
Huang, Shing-Jong
;
Hung, Chin-Te
;
Liu, Shou-Heng
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.
Hollowed carbon capsule based Pt-Fe/carbon electrodecatalysts prepared by chemical vapor infiltration method
(2008-07-01)
Lo, An-Ya
;
Liu, Shou-Heng
;
Huang, Shing-Jong
;
Kuo, Cheng-Tzu
;
Liu, Shang-Bin
A new type of hollowed carbon capsule (HCC) material has been fabricated and utilized as a support for Pt-Fe catalyst by means of chemical vapor infiltration (CVI) method. The supported Pt-Fe/HCC catalyst was found to possess cavities with sizes around 20-40 nm and well-dispersed Pt-Fe alloy particles embedded on the internal graphitic carbon walls and hence can be used as potential electrodecatalyst for fuel cells. Preliminary performance tests by cyclic voltammetry revealed that the supported Pt-Fe/HCC catalyst has electrochemical properties compatible to a common commercial catalyst. The formation mechanism of the HCC material is also proposed. (c) 2008 Elsevier B.V. All rights reserved.
Synthesis of uniform carbon nanotubes by chemical vapor infiltration method using SBA-15 mesoporous silica as template
(2007)
Lo, An-Ya
;
Liu, Shou-Heng
;
Huang, Shing-Jong
;
Shen, Huang-Kai
;
Kuo, Cheng-Tzu