为探究电极制备过程对材料双电层电容可能带来的变化,以褐藻为前驱体制备多孔碳,研究了电容测试过程中碳颗粒尺寸和电极制片压力两种工艺参数对其双电层电容性能的影响规律.通过将多孔碳粉末严格筛分成5组不同的尺寸,分别制成电极并测试其充放电性能和循环伏安曲线,得到比电容随颗粒尺寸变化的规律;再选取优化尺寸的多孔碳,在4种不同的压力下制成电极片,进而研究了不同制片压力对电极电容的影响规律.研究表明,在微米级,所制电极的比电容随碳颗粒尺寸的减小显著增加,同时随制片压力的增大,比电容先增大后减小.本实验条件下,碳颗粒尺寸小于25 μm、制片压力为10 MPa(对应电极片所受真实压强约619 MPa)时,得到的电极片具有最高的比电容值.
To study the possible changes in the electrical double-layer capacitance ( EDLC ) of materials during electrode processing, effects of carbon particle size and electrode pressure on the electrical double-layer capacitors (EDLCs) were studied using brown algae as porous carbon precursors. The carbon powder was ground and sieved into five groups with different particle size distributions, and then used as electrodes. The following electrochemical tests including charge-discharge curves and cyclic voltammetry show that the specific capacitance of the electrodes notably increases with the decrease of carbon particle size, and peaks at 10 MPa with the increase of pressure. Under the conditions of this paper, the parameters of carbon particle size less than 25 μm and processing pressure of 10 MPa ( correspondingly, the real pressure added on electrodes is around 619 MPa) provides the best capacitive performance among all the samples.
参考文献
| [1] | Adinaveen Thambidurai;John Kennedy Lourdusamy;Judith Vijaya John;Sekaran Ganesan.Preparation and electrochemical behaviour of biomass based porous carbons as electrodes for supercapacitors - a comparative investigation[J].The Korean journal of chemical engineering,20142(2):268-275. |
| [2] | Wei Chen;R. B. Rakhi;M. N. Hedhili.Shape-controlled porous nanocarbons for high performance supercapacitors[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,201415(15):5236-5243. |
| [3] | Yeru Liang;Fengxue Liang;Hui Zhong.An advanced carbonaceous porous network for high-performance organic electrolyte supercapacitors[J].Journal of Materials Chemistry, A. Materials for energy and sustainability,201324(24):7000-7005. |
| [4] | Wenjing Qian;Fengxia Sun;Yanhui Xu;Lihua Qiu;Changhai Liu;Suidong Wang;Feng Yan.Human hair-derived carbon flakes for electrochemical supercapacitors[J].Energy & environmental science: EES,20141(1):379-386. |
| [5] | 张治安;杨邦朝;邓梅根;胡永达.超电容器活性炭/炭黑复合电极电容特性研究[J].电子元件与材料,2004(12):28-31. |
| [6] | Zhang, L.;Yang, X.;Zhang, F.;Long, G.;Zhang, T.;Leng, K.;Zhang, Y.;Huang, Y.;Ma, Y.;Zhang, M.;Chen, Y..Controlling the effective surface area and pore size distribution of sp~2 carbon materials and their impact on the capacitance performance of these materials[J].Journal of the American Chemical Society,201315(15):5921-5929. |
| [7] | Jennifer M. Black;Heather A. Andreas.Pore Shape Affects Spontaneous Charge Redistribution in Small Pores[J].The journal of physical chemistry, C. Nanomaterials and interfaces,201027(27):12030-12038. |
| [8] | J. Segalini;B. Daffos;P. L. Taberna;Y. Gogotsi;P. Simon.Qualitative Electrochemical Impedance Spectroscopy study of ion transport into sub-nanometer carbon pores in Electrochemical Double Layer Capacitor electrodes[J].Electrochimica Acta,201025(25):7489-7494. |
| [9] | Yanwu Zhu;Shanthi Murali;Meryl D. Stoller;K. J. Ganesh;Weiwei Cai;Paulo J. Ferreira;Adam Pirkle;Robert M. Wallace;Katie A. Cychosz;Matthias Thommes;Dong Su;Eric A. Stach;Rodney S. Ruoff.Carbon-Based Supercapacitors Produced by Activation of Graphene[J].Science,2011Jun.24 TN.6037(Jun.24 TN.6037):1537-1541. |
| [10] | Wang, H.;Xu, Z.;Kohandehghan, A.;Li, Z.;Cui, K.;Tan, X.;Stephenson, T.J.;King'Ondu, C.K.;Holt, C.M.B.;Olsen, B.C.;Tak, J.K.;Harfield, D.;Anyia, A.O.;Mitlin, D..Interconnected carbon nanosheets derived from hemp for ultrafast supercapacitors with high energy[J].ACS nano,20136(6):5131-5141. |
| [11] | Ryu Zhenyu;Zheng Jingtang;Wang Maozhang;Zhang Bijinang.Characterization of pore size distributions on carbonaceous adsorbents by DFT[J].Carbon: An International Journal Sponsored by the American Carbon Society,19998(8):1257-1264. |
| [12] | Yunyong Li;Zesheng Li;Pei Kang Shen.Simultaneous Formation of Ultrahigh Surface Area and Three-Dimensional Hierarchical Porous Graphene-Like Networks for Fast and Highly Stable Supercapacitors[J].Advanced Materials,201317(17):2474-2480. |
| [13] | PATRICE SIMON;YURY GOGOTSI.Materials for electrochemical capacitors[J].Nature materials,200811(11):845-854. |
| [14] | Stoller MD;Park SJ;Zhu YW;An JH;Ruoff RS.Graphene-Based Ultracapacitors[J].Nano letters,200810(10):3498-3502. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%