期刊
BIORESOURCE TECHNOLOGY
卷 111, 期 -, 页码 185-190出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.02.010
关键词
Energy storage; Supercapacitors; Activated carbons; Argan seed shells; KOH-activation
资金
- AECID, Ministerio de Asuntos Exteriores y Cooperacion, Spain [A/024015/09]
- COLCIENCIAS, Colombia
Activated carbons were prepared by KOH-activation of argan seed shells (ASS). The activated carbon with the largest surface area and most developed porosity was superficially treated to introduce oxygen and nitrogen functionalities. Activated carbons with a surface area of around 2100 m(2)/g were obtained. Electrochemical measurements were carried out with a three-electrode cell using 1 M H2SO4 as electrolyte and Ag/AgCl as reference electrode. The O-rich activated carbon showed the lowest capacitance (259 F/g at 125 mA/g) and the lowest capacity retention (52% at 1 A/g), due to surface carboxyl groups hindering electrolyte diffusion into the pores. Conversely, the N-rich activated carbon showed the highest capacitance (355 F/g at 125 mA/g) with the highest retention (93% at 1 A/g), due to its well-developed micro-mesoporosity and the pseudocapacitance effects of N functionalities. This capacitance performance was among the highest reported for other activated carbons from a large variety of biomass precursors. (C) 2012 Elsevier Ltd. All rights reserved.
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