Hierarchical porous activated carbon produced from spinach leaves as an electrode material for an electric double layer capacitor
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摘要: 采用 KOH 活化高温裂解的菠菜叶,制得分级孔活性炭。 低温氮气吸脱附表明利用 KOH 活化所制活性炭材料含有微孔、介孔和大孔,且比表面积高达 2616 m 2 / g。 FE-SEM 和 FTIR 表明,分级孔活性炭呈颗粒状,且表面含有富氧官能团。采用循环伏安(CV)、恒流充放电(GCD)和电化学阻抗谱(EIS)等测试技术,对分级孔活性炭进行电化学性能表征。 在三电极测试体系中,分级孔活性炭在 CV 曲线中呈现良好矩形特征的双电层电容行为;在充放电电流密度为 1 A/ g 下,其比电容值为 238F/ g。 利用该分级孔活性炭所组装的水系对称双电层电容器,其电压可达到 1. 2 V,同时具有可观的能量密度,较高的放电倍率及良好的电化学充放电稳定性。Abstract: Hierarchical porous activated carbon (AC) was obtained by the carbonization of dried spinach leaves followed by acti-vation with KOH. The product was characterized by nitrogen adsorption, FT-IR, FE-SEM and electrochemical tests. The AC has a dominant number of micropores, a medium number of mesopores and a few macropores with a specific surface area up to 2616 m 2 / g and a large number of oxygen-containing functional groups. The AC electrode exhibits a good double-layer capacitive behavior with a specific capacitance of 238 F/ g in a 2 mol/ L KOH electrolyte. A supercapacitor made of the AC has a high energy density of 10. 1 Wh/ Kg at a current density of 0. 5A/ g and an excellent cyclic stability for 2000 cycles over a potential range from 0 to 1. 2V.
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Key words:
- Spinach leaves /
- Activation /
- Activated carbon /
- Supercapcitor
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