Back to Search Start Over

Influence of Synthesis Conditions and Heat Treatment on the Structure of Ti3SiC2-Derived Carbons

Authors :
Thanh X. Nguyen
Suresh K. Bhatia
Jun-Seok Bae
Source :
The Journal of Physical Chemistry C. 114:1046-1056
Publication Year :
2009
Publisher :
American Chemical Society (ACS), 2009.

Abstract

We investigate the characterization and adsorption modeling of Ti3SiC2-derived carbons (Ti3SiC2-DCs) prepared by chlorination at three temperatures (600, 800, and 1000 degrees C) as well as samples heat-treated at 1100 degrees C for one and three day periods. The modeling exploits our recent finite Wall thickness model-based density functional theory approach (Nguyen, T. X.; Bhatia, S. K. Langmuir 2004, 20, 3532), Utilizing experimental adsorption isotherms OF Ar at 87 K for the characterization. In general, characterization results show that the carbon wall structure of carbide-derived carbons (CDCs) is precursor-inherited, and Ti3SiC2-DCs have predominantly graphitic walls whose helium density is close to the true density of graphite (2.27 g/cm(3)), while SiC-derived carbons (SiC-DCs) have predominantly diamond-like walls whose helium density approaches the true density of diamond (3.52 g/cm(3)). This precursor-inherited character is also seen to give rise to two distinct evolutions of the Pore Structure of Ti3SiC2-DCs and SiC-DCs under chlorination temperature or post-heat-treatment conditions. In Particular, both pore enlargement and opening are observed for Ti3SiC2-DCs, but only pore opening, especially in the region of smallest pores (

Details

ISSN :
19327455 and 19327447
Volume :
114
Database :
OpenAIRE
Journal :
The Journal of Physical Chemistry C
Accession number :
edsair.doi...........7ca6b36576c382a3dcb94dfcd615533c
Full Text :
https://doi.org/10.1021/jp9081917