The effects of activation conditions on the supercapacitive performance of porous activated biochar
首发时间:2017-05-12
Abstract:The porous carbons derived from naturally abundant bamboo shoot shell for the application of supercapacitor are further activated by chemical activation with ZnCl2, H3PO4 and K2CO3. The influences of activation condition on the pore structure and physicochemical properties of the as-prepared porous carbon samples are investigated by scanning electron microscopy (SEM), transmission electron microscope (TEM), nitrogen adsorption-desorption isotherm, cyclic voltammogram (CV), galvanostatic charge-discharge (GCD) test, electrochemical impedance spectroscopy (EIS) and cycle life measurement. The results show that the porous activated carbon prepared at 1:1 weight ratio of K2CO3 to bamboo shoot shell exhibits a specific surface area of 1800 m2 g-1 with the average pore size of 3.35 nm (AC-K2CO3-900). In addition, the AC-K2CO3-900 shows a high specific capacitance of 287 F g-1 at the current density of 1 A g-1. Moreover, the AC-K2CO3-900 supercapacitor holds high capacitance retention of 95.80% even after 10000 cycles, indicating its potential prospect for the application of high-performance supercapacitors.
keywords: Bamboo shoot shell Porous carbon Activation conditions Activated carbon Supercapacitor
点击查看论文中文信息
活化方式对多孔活性生物炭材料的结构及电容性能的影响
摘要:活性炭材料因其比表面高,价格低廉,导电性好等特点被广泛应用于双电层电容器电极材料。影响活性炭性能的主要两个关键因素是原料和活化方式,本文采用来源丰富的生物质废弃物竹笋壳制备多孔炭材料,而后将其分别浸渍 ZnCl2、H3PO4、K2CO3进行活化处理,一步法制备了竹笋壳基活性多孔炭材料。并采用多种手段对材料的物理结构及电容性能进行了表征,探讨了不同活化方式对竹笋壳基活性炭材料的各方面性能的影响。结果表明,笋壳与K2CO3以质量比为1:1活化制备得到的多孔活性炭比表面积高达1800 m2 g-1,平均孔径在3.35 nm 左右。该多孔活性炭在1 A g-1下比电容高达287 F g-1。经过10000次循环后,容量保持率为95.80%,表明材料具有良好循环稳定性。该材料在高性能超级电容器中具有良好的应用前景。
基金:
引用
No.4732705119500914****
同行评议
共计0人参与
勘误表
活化方式对多孔活性生物炭材料的结构及电容性能的影响
评论
全部评论0/1000