通过多种电化学测试技术评价了石墨电极在2.3 mol/L H2 SO4溶液中的电化学活化工艺及其准电容性能。结果表明,活化工艺宜采用恒电流阶跃技术,最佳工艺参数为：阳极电流密度为200 mA·cm-2,阴极电流密度为-120 mA·cm-2,对应活化时间分别为300 s和100 s,循环6次。改性后的石墨电极表面形成了多孔、粗糙的三维活性层,单位面积上具有较高的电容量(2.08 F·cm-2)和良好的倍率特性,可作为一种优异的准电容器材料。
A graphite electrode ( GE) was modified in a 2. 3 mol/L H2 SO4 solution using GE as a working electrode, Pt as a counter electrode andsaturatedcalomelelectrode ( SCE) as a reference electrodeby a galvanic method under a constant current. Results showed thatafter the GE was optimally modified at a current of 200 mAfor 300 s and -120 mA for 100 s for 6 cycles, it had a porˉ ous, rough and threeˉdimensional active layer with a pseudo capacitance of 2. 08 F/cm2 . The modified GE had a much lower resistˉ ance and higher sweep rate than the unmodified one.
参考文献
| [1] | Kinoshita K.Carbon:Electrochemical and Physicochemical Propˉ erties[M].New York:Wiley,1988 |
| [2] | 夏永姚;李会巧 .高比表面鳞片状石墨作为电极材料的电化学电容器[P].中国专利:ZL200710036305.8,2007. |
| [3] | Emi Gomibuchi;Takayuki Ichikawa;Koichi Kimura .Electrode properties of a double layer capacitor of nano-structured graphite produced by ball milling under a hydrogen atmosphere[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(5):983-988. |
| [4] | Yong Zhang;Hui Feng;Xingbing Wu;Lizhen Wang;Aiqin Zhang;Tongchi Xia;Huichao Dong;Xiaofeng Li;Linsen Zhang .Progress of electrochemical capacitor electrode materials: A review[J].International journal of hydrogen energy,2009(11):4701-4707. |
| [5] | Sullivan M G;Schnyder B;B?rtsch M et al.Electrochemically modified glassy carbon for capacitor electrodes characterization of thick anodic layers by cyclic voltammetry,differential electroˉ chemical mass spectrometry,spectroscopic ellipsometry,Xˉray photoelectron spectroscopy,FTˉIR,and AFM[J].J Electroˉ chem Soc,2000,147(07):2636-2643. |
| [6] | Sullivan Melani G.;Kotz Rudiger .Thick Active Layers of Electrochemically Modified Glassy Carbon Electrochemical Impedance Studies[J].Journal of the Electrochemical Society,2000(1):308-317. |
| [7] | Mykola Seredych;Denisa Hulkova-Jurcakova;Gao Qing Lu .Surface functional groups of carbons and the effects of their chemical character, density and accessibility to ions on electrochemical performance[J].Carbon: An International Journal Sponsored by the American Carbon Society,2008(11):1475-1488. |
| [8] | Conway B E.Electrochemical Supercapacitors Scientific Fundaˉ mentals and Technological Applications[M].Kluwer Acad/Pleˉ num Publ,New York,1999:22-23. |
| [9] | Wang Z.;Huang X.;Xue R.;Chen L.;Lu Z. .Chemical and crystalline structure characterizations of polyfurfuryl alcohol pyrolyzed at 600 degrees C[J].Carbon: An International Journal Sponsored by the American Carbon Society,1998(1/2):51-59. |
| [10] | Barbero C;Silber J J;Sereno L .Studies of surfaceˉmodified glassy carbon electrodes obtained by electrochemical treatment:Its effect on Ru(bpy)2+3 adsorption and the electron transfer rates of the Fe2+/Fe3+ couple[J].Journal of Electroanalytical Chemistry,1988,248(02):321-340. |
| [11] | Elzbieta Frackowiak;Francois Beguin .Carbon materials for the electrochemical storage of energy in capacitors[J].Carbon: An International Journal Sponsored by the American Carbon Society,2001(6):937-950. |
| [12] | Besenhard J O;Fritz H P .The electrochemistry of black carˉ bons[J].Angew Chem Int Ed Engl,1983,22(12):950-975. |
| [13] | Kim JH;Nam KW;Ma SB;Kim KB .Fabrication and electrochemical properties of carbon nanotube film electrodes[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(10):1963-1968. |
| [14] | 崔晓莉,江志裕.交流阻抗谱的表示及应用[J].上海师范大学学报(自然科学版),2001(04):53-61. |
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