Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 10, Pages 1594-1597Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.08.022
Keywords
Electrical double-layer capacitor; Activated carbon; Coffee beans; Agricultural wastes; Surface functional groups
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Funding
- Australian Research Council
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Activated carbon was produced from waste coffee grounds by treatment with ZnCl2. Supercapacitor electrodes prepared from this coffee grounds carbon exhibited energy densities up to 20 Wh kg(-1) in 1 M H2SO4, and excellent stability at high charge-discharge rates. In a two-electrode cell a specific capacitance as high as 368 F g(-1) was observed, with rectangular cyclic voltammetry curves and stable performance over 10,000 cycles at a cell potential of 1.2 V and current load of 5 A g(-1). The good electrochemical performance of the coffee grounds carbon was attributed to a well developed porosity, with a distribution of micropores and mesopores 2-4 nm wide, and the presence of electrochemically active quinone oxygen groups and nitrogen functional groups. This work highlights the potential to utilize waste biomass to produce electrode materials for cost-effective energy storage systems. (C) 2008 Elsevier B.V. All rights reserved.
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