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


Autoria(s): Wang, Da-Wei; Li, Feng; Fang, Hai-Tao; Liu, Min; Lu, Gao-Qing; Cheng, Hui-Ming
Contribuinte(s)

George C. Schatz

Data(s)

01/01/2006

Resumo

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.

Identificador

http://espace.library.uq.edu.au/view/UQ:78934

Idioma(s)

eng

Publicador

American Chemical Society

Palavras-Chave #Chemistry, Physical #Electrochemical Impedance Spectroscopy #Double-layer Capacitors #Templating Procedure #Porous-electrodes #Activated Carbons #Size Distribution #C1 #291804 Nanotechnology #670799 Other
Tipo

Journal Article