Empirical analysis of the contributions of mesopores and micropores to double-layer capacitance of carbons

Rufford, Thomas E., Hulicova-Jurcakova, Denisa, Zhu, Zhonghua and Lu, Gaoqing (2009) Empirical analysis of the contributions of mesopores and micropores to double-layer capacitance of carbons. Journal of Physical Chemistry C, 113 44: 19335-19343. doi:10.1021/jp905975q


Author Rufford, Thomas E.
Hulicova-Jurcakova, Denisa
Zhu, Zhonghua
Lu, Gaoqing
Title Empirical analysis of the contributions of mesopores and micropores to double-layer capacitance of carbons
Journal name Journal of Physical Chemistry C   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2009-11-05
Year available 2009
Sub-type Article (original research)
DOI 10.1021/jp905975q
Volume 113
Issue 44
Start page 19335
End page 19343
Total pages 9
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Subject 0904 Chemical Engineering
C1
100799 Nanotechnology not elsewhere classified
970109 Expanding Knowledge in Engineering
Formatted abstract
Activated carbons with large mesopore volumes were prepared from waste coffee grounds by chemical activation with ZnCl2. These carbons exhibited excellent electrochemical double-layer capacitance of up to 368 F g-1 in 1 M H2SO4. The effect of carbonization temperature and ZnCl2 ratio on carbon pore development and consequently electrochemical double-layer capacitance in 1 M H2SO4 is discussed. Cyclic voltammetry, electrochemical impedance spectroscopy, and galvanic charge- discharge cycles were used to study the effects of mesopores on capacitance at fast charge rates. Activated carbons with greater mesopore content retained higher specific capacitance at fast charge-discharge rates as the mesopores acts as channels or reservoirs for electrolyte transport. An improved model for evaluation of contributions to capacitance from micropore surfaces and mesopore surfaces is proposed. Using this model, the contribution of the mesopores to double-layer capacitance was determined to be 17 µF cm-2 . The contribution of micropores to capacitance decreased at fast discharge rates and was found to be dependent on the number of mesopores, which influence the transport of ions through the carbon pore network.   
Keyword mesopores, carbons
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2010 Higher Education Research Data Collection
School of Chemical Engineering Publications
ERA 2012 Admin Only
 
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Created: Mon, 09 Nov 2009, 22:13:43 EST by Dr Thomas Rufford on behalf of School of Chemical Engineering