采用沥青焦为原料,以NaOH化学活化法制备出不同碱炭比(R)系列活性炭.用氮气吸附和脱附等温线计算出BET比表面积、DFT孔径分布及孔容,并且通过直流循环充放电、循环伏安等表征方法研究了其电化学性能.实验结果表明,R值对活性炭的BET比表面积、DFT孔径分布及孔容有良好的调控作用:当R=5时,其最大BET比表面积为1089m~2/g,孔容达0.53 cm~3/g,当R=3时,其孔径分布在1.0-2.0nm百分比达36.2%;其直流循环充放电曲线较好,循环伏安曲线也近似矩形,表明具有良好双电子层电容器电极材料特性,在3moL/L的KOH电解液体系中,最大质量比电容、体积比电容、单位面积比电容分别达202F/g、143F/cm~3、32.9μF/cm~2;在1 moL/L(C_2H_5)_4NBF_4/Pmpylene Carbonate(PC)电解液体系中,最大质量比电容、体积比电容、单位面积比电容分别达149F/g、107.3 F/cm~3、20μF/cm~2.对KOH和(C_2H_5)_4NBF_4/PC电解质吸附的最佳孔径分别为1.3nm,1.5nm左右.
A series of petroleum coke-based activated carbons ( Acs) were prepared by chemical activation method in different NaOH/petroleum coke ratios(R). Pore properties of these activated carbons including the BET specific surface area, pore diameter, pore size distribution and pore volume were characterized by DFT method based on N2 adsorption/desorption isotherm. Electrochemical performances were characterized by chronopotentiograms, cyclic voltammetry, ad so on It is found that the NaOH/petroleum coke ratio (R) can control the BET specific surface area and DFT pore size distribution well. When R = 5 , the BET specific surface area and pore volume reach 1089 cm~2/g and 0. 53 cm~3/g respectively. When R =3, the percentage of pore diameter ranged from 1.0 to 2. 0 nm is 36. 2% . The study shows that the AC( R = 3 ) exhibits a good performance as an electrode material of electric double layer capacitors ( EDLCs) since the charge-discharge curve is good and the cyclic voltammetry curve approximates to rectangle. The maximum quality, volume and unit surface area specific capacitance obtained in 3 mol/L KOH are 149F/g,107. 3F/cm~3, and 20 μF/cm and those in 1 mol/L (C_2H_5)_4NBF_4/propylene carbonate (PC) electrolytic solution are 149F/g,107. 3F/cm~3 and 20 μF/cm~2. Are equal to about 202 F/g, 143 F/cm~3 and 32.9μF/cm~2. The optimum adsorption pore diameters of KOH and (C_2H_5)_4NBF_4/PC electrolyte are 1. 3 nm and 1.5 nm respectively.
参考文献
| [1] | M.A.Lillo-Rodenas;D.Lozano-Castello;D.Cazorla-Amoros;A.Linares-Solano .Preparation of activated carbons from Spanish anthracite (II.Activation by NaOH)[J].Carbon: An International Journal Sponsored by the American Carbon Society,2001(5):751-759. |
| [2] | M.A. Lillo-Rodenas;D. Cazorla-Amoros;A. Linares-Solano .Understanding chemical reactions between carbons and NaOH and KOH An insight into the chemical activation mechanism[J].Carbon: An International Journal Sponsored by the American Carbon Society,2003(2):267-275. |
| [3] | Gu-Gon Park;Tae-Hyun Yang;Young-Gi Yoon;Won-Yong Lee;Chang-Soo Kim .Pore size effect of the DMFC catalyst supported on porous materials[J].International journal of hydrogen energy,2003(6):645-650. |
| [4] | Perrin A;Celzard A;Albiniak A;Kaczmarczyk J;Mareche JF;Furdin G .NaOH activation of anthracites: effect of temperature on pore textures and methane storage ability[J].Carbon: An International Journal Sponsored by the American Carbon Society,2004(14):2855-2866. |
| [5] | Perrin, A;Celzard, A;Albiniak, A;Jasienko-Halat, M;Mareche, JF;Furdin, G .NaOH activation of anthracites: effect of hydroxide content on pore textures and methane storage ability[J].Microporous and Mesoporous Materials,2005(1/3):31-40. |
| [6] | A. Celzard;A. Perrin;A. Albiniak .The effect of wetting on pore texture and methane storage ability of NaOH activated anthracite[J].Fuel,2007(3):287-293. |
| [7] | 何月德,刘洪波,张红波.活化剂用量对无烟煤基高比表面积活性炭电容特性的影响[J].新型炭材料,2002(04):18-22. |
| [8] | 戴贵平,刘敏,王茂章,成会明.电化学电容器中炭电极的研究及开发I. 电化学电容器[J].新型炭材料,2002(01):71-79. |
| [9] | 侯朝辉,李新海,刘恩辉,何则强,邓凌峰.同步合成模板炭化法制备双电层电容器电极用中孔炭材料的研究[J].新型炭材料,2004(01):11-15. |
| [10] | 刘辰光,方海涛,王大伟,李峰,刘敏,成会明.添加多壁纳米碳管活性炭电极材料的电化学电容特性[J].新型炭材料,2005(03):205-210. |
| [11] | 李强,李开喜,王芙蓉,孙国华.针状焦基活性炭的制备及其作为EDLCs电极材料的电化学性能[J].新型炭材料,2005(04):335-342. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%