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http://dx.doi.org/10.1016/j.jiec.2010.10.025

Performance of electrochemical double layer capacitors using highly porous activated carbons prepared from beer lees  

Lee, Sang Guk (Center for Functional Nano Chemicals and School of Applied Chemical Engineering, Chonnam National University)
Park, Kwang Hyun (Center for Functional Nano Chemicals and School of Applied Chemical Engineering, Chonnam National University)
Shim, Wang Geun (Center for Functional Nano Chemicals and School of Applied Chemical Engineering, Chonnam National University)
balathanigaimani, M.S. (Department of Petroleum Engineering, Rajiv Gandhi Institute of Petroleum Technology)
Moon, Hee (Center for Functional Nano Chemicals and School of Applied Chemical Engineering, Chonnam National University)
Publication Information
Journal of Industrial and Engineering Chemistry / v.17, no.3, 2011 , pp. 450-454 More about this Journal
Abstract
Beer lees precursor is chosen to prepare activated carbons having different physical and chemical properties. The beer lees-based activated carbons (BL-ACs) are characterized by $N_2$ adsorption/desorption isotherms, adsorption energy distributions (AEDs), and X-ray photoelectric spectroscopy (XPS). Furthermore the electrochemical properties of the BL-ACs are assessed using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and constant current charge/discharge method. The maximum specific capacitance (about 188 F/g at discharge current of l mA/$cm^2$) is obtained in 0.1 M $H_2SO_4$ electrolyte solution, which is a relatively low electrolyte concentration. The overall results suggest that the BL-ACs are good candidates for EDLC electrode materials.
Keywords
Beer lees; Activated carbon; Adsorption energy distribution; Surface functional groups; Electrical double layer capacitor;
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