Pore accessibility of Ti3SiC2-derived carbons

Bae, Jun-Seok, Nguyen, Thanh X. and Bhatia, Suresh K. (2014) Pore accessibility of Ti3SiC2-derived carbons. Carbon, 68 531-541. doi:10.1016/j.carbon.2013.11.031


Author Bae, Jun-Seok
Nguyen, Thanh X.
Bhatia, Suresh K.
Title Pore accessibility of Ti3SiC2-derived carbons
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2014-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.carbon.2013.11.031
Open Access Status Not yet assessed
Volume 68
Start page 531
End page 541
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Abstract We investigate the accessibility of Ti3SiC2-derived carbons (Ti3SiC2-DCs) synthesized non-isothermally using a temperature ramp. The microstructure of the Ti3SiC2-DCs is characterized using TEM, XRD, Raman spectroscopy and gas adsorption. For the characterization by gas adsorption, we adopt our Finite Wall Thickness (FWT) model to invert Ar adsorption isotherms at 87 K to obtain pore size and pore wall thickness distributions of the Ti3SiC2-DCs. Accordingly, we identify a pore accessibility problem in the Ti 3SiC2-DCs, as reported for Ti3SiC 2-DCs prepared at 1073 K in our previous work. A striking feature is that Ti3SiC2-DC prepared at the slowest ramping rate (2 K/min) has a very narrow pore size distribution, while the Ti 3SiC2-DCs synthesized at higher ramping rates (5 and 15 K/min) have much broader pore size distributions centered around 5.2 Å. A significant amount of previously unreported ultra-microporosity is observed based on low pressure CO2 adsorption at 273 K. Our results indicate that slow ramping rate could potentially be utilized for fine control of the ultra-microporosity of carbide-derived carbons. Finally, we have found that fast ramping rate above 5 K/min leads to subtle changes in microstructure, with long and periodic graphitic multilayers having some large pores formed in between.
Keyword Chemistry, Physical
Materials Science, Multidisciplinary
Chemistry
Materials Science
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2014 Collection
 
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 12 times in Scopus Article | Citations
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