Departamento de Química Inorgánica, Universidad de Granada, 18071 Granada, Spain.
Bioresour Technol. 2012 May;111:185-90. doi: 10.1016/j.biortech.2012.02.010. Epub 2012 Feb 14.
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 1M H(2)SO(4) 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 1A/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 1A/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.
通过 KOH 活化阿甘果壳制备了活性炭。经过表面处理，引入了氧和氮官能团，得到了比表面积最大、孔隙最发达的活性炭。得到了比表面积约为 2100 m(2)/g 的活性炭。采用三电极电池，以 1M H(2)SO(4)为电解质，Ag/AgCl 为参比电极进行电化学测量。富氧活性炭的电容最低（125 mA/g 时为 259 F/g），容量保持率最低（1A/g 时为 52%），这是由于表面羧基基团阻碍了电解质向孔内的扩散。相反，富氮活性炭的电容最高（125 mA/g 时为 355 F/g），容量保持率最高（1A/g 时为 93%），这是由于其发达的微孔-介孔结构和 N 官能团的赝电容效应。这种电容性能在其他各种生物质前体制备的活性炭中属于最高水平之一。
