研究了商用活性炭作为电极的双电层电容器在水系和有机系电解液中的电容和活性炭孔结构的关系.水系电解液采用1 mol/L的H2SO4溶液、有机系电解液采用1 mol/L的TEMA/PC溶液.结果表明:水系和有机系电解液中的电容存在线性关系.电容由活性炭微孔表面和其他大孔构成的表面两部分提供(分别称为Cmicro和Cext).其中Cmicro较小并对电流有依赖性、而Cext近似为一个常数、不随电流改变.
The dependence of electric double layer capacitance on the pore structure of commercially available activated carbons in both nonaqueous and aqueous electrolytes was studied. Capacitance in the nonaqueous electrolyte (propylene carbonate solution of 1 mol/L triethyl-methyl-ammonium tetrafluoroborate) was linearly related to that in the aqueous electrolyte (1 mol/L H2SO4 solution). The contributions of the microporous surface area, Cmicro., and the surface formed on account of other large pores, Cext., were separately evaluated, the former being small and depending strongly on current density and the latter being almost constant.
参考文献
| [1] | Conway B E.Electrochemical Supercapacitors Scientific Fundamentals and Technological Applications[M].Kluwer Academic/Plenum Publishers,1999 |
| [2] | Shiraishi S .Electric double layer capacitance of highly porous carbon derived from lithium metal and polytetrafluroethylene[J].Electrochemical and Solid-State Letters,2001,4:A5. |
| [3] | Frackowiak E;Beguin F .Carbon materials for the electrocbemical storage of energy in capacitors[J].Carbon,2001,39:937-950. |
| [4] | Braun A;Bartsch M;Schnyder B et al.X-ray scattering and adsorption studies of thermally oxidized glassy carbon[J].Journal of Non-Crystalline Solids,1999,260:1-14. |
| [5] | Barbieri O;Hahn M;Kotz R .Capacitance limits of high surface area activated carbons for double layer capacitors[J].Carbon,2005,43:1303-11310. |
| [6] | A. B. Fuertes;G. Lota;T. A. Centeno;E. Frackowiak .Templated mesoporous carbons for supercapacitor application[J].Electrochimica Acta,2005(14):2799-2805. |
| [7] | T.A. Centeno;M. Sevilla;A.B. Fuertes .On the electrical double-layer capacitance of mesoporous templated carbons[J].Carbon: An International Journal Sponsored by the American Carbon Society,2005(14):3012-3015. |
| [8] | T. Morishita;Y. Soneda;T. Tsumura .Preparation of porous carbons from thermoplastic precursors and their performance for electric double layer capacitors[J].Carbon: An International Journal Sponsored by the American Carbon Society,2006(12):2360-2367. |
| [9] | Lihong Wang;Takahiro Morishita;Masahiro Toyoda;Michio Inagaki .Asymmetric electric double layer capacitors using carbon electrodes with different pore size distributions[J].Electrochimica Acta,2007(2):882-886. |
| [10] | J.A. Fernandez;T. Morishita;M. Toyoda;M. Inagaki;F. Stoeckli;T.A. Centeno .Performance of mesoporous carbons derived from poly(vinyl alcohol) in electrochemical capacitors[J].Journal of Power Sources,2008(1):675-679. |
| [11] | Shi H .Activated carbons and double layer capacitance[J].Electrochimica Acta,1996,41:1633-1639. |
| [12] | Lihong Wang;Masahito Fujita;Michio Inagaki .Relationship between pore surface areas and electric double layer capacitance in non-aqueous electrolytes for air-oxidized carbon spheres[J].Electrochimica Acta,2006(19):4096-4102. |
| [13] | Okamura M.Electric Double Layer Capacitors and Electricity Storage Systems[M].Nikkan Kogyo Shinbun,2001 |
| [14] | Inagaki M;Kang F.Carbon Materials Science and Engineering From Fundamental to Applications[M].Tsinghua Univ Press,2006:514. |
| [15] | Centeno TA;Hahn M;Fernandez JA;Kotz R;Stoeckli F .Correlation between capacitances of porous carbons in acidic and aprotic EDLC electrolytes[J].Electrochemistry communications,2007(6):1242-1246. |
| [16] | Centeno T A;Soeckli F .The role of textural characteristics and oxygen-containing surface groups in the supercapacitor performances of activated carbons[J].Electrochimica Acta,2006,52:560. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%