Effect of pore packing defects in 2-D ordered mesoporous carbons on ionic transport

Wang, Da-Wei, Li, Feng, Fang, Hai-Tao, Liu, Min, Lu, Gao-Qing and Cheng, Hui-Ming (2006) Effect of pore packing defects in 2-D ordered mesoporous carbons on ionic transport. Journal of Physical Chemistry B, 110 17: 8570-8575. doi:10.1021/jp0572683

Author Wang, Da-Wei
Li, Feng
Fang, Hai-Tao
Liu, Min
Lu, Gao-Qing
Cheng, Hui-Ming
Title Effect of pore packing defects in 2-D ordered mesoporous carbons on ionic transport
Journal name Journal of Physical Chemistry B   Check publisher's open access policy
ISSN 1520-6106
Publication date 2006
Sub-type Article (original research)
DOI 10.1021/jp0572683
Volume 110
Issue 17
Start page 8570
End page 8575
Total pages 6
Editor George C. Schatz
Place of publication Washington , D.C.
Publisher American Chemical Society
Collection year 2006
Language eng
Subject C1
291804 Nanotechnology
670799 Other
Abstract Ordered mesoporous materials show great importance in energy, environmental, and chemical engineering. The diffusion of guest species in mesoporous networks plays an important role in these applications, especially for energy storage, such as supercapacitors based on ordered mesoporous carbons ( OMCs). The ion diffusion behavior in two different 2-D hexagonal OMCs was investigated by using cyclic voltametry and electrochemical impedance spectroscopy. In addition, transmission electron microscopy, small-angle X-ray diffraction, and nitrogen cryosorption methods were used to study the pore structure variations of these two OMCs. It was found that, for the OMC with defective pore channels ( termed as pore packing defects), the gravimetric capacitance was greatly decayed when the voltage scan rate was increased. The experimental results suggest that, for the ion diffusion in 2-D hexagonal OMCs with similar mesopore size distribution, the pore packing defect is a dominant dynamic factor.
Keyword Chemistry, Physical
Electrochemical Impedance Spectroscopy
Double-layer Capacitors
Templating Procedure
Activated Carbons
Size Distribution
Q-Index Code C1

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Created: Wed, 15 Aug 2007, 08:01:27 EST