Improved capacitance characteristics during electrochemical charging of carbon nanotubes modified with polyoxometallate monolayers

被引：90
作者：
Skunik, Magdalena [1 ]
Chojak, Malgorzata [1 ]
Rutkowska, Iwona A. [1 ]
Kulesza, Pawel J. [1 ]
机构：
[1] Univ Warsaw, Dept Chem, PL-02093 Warsaw, Poland
来源：
ELECTROCHIMICA ACTA | 2008年 / 53卷 / 11期
关键词：
multi-walled carbon nanotubes; phosphododecamolybdate adsorbate; double-layer capacitance; redox pseudocapacitance; voltammetry; galvanostatic charging and discharging; AC impedance;
D O I：
10.1016/j.electacta.2007.11.049
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
By modification of surfaces of multi-walled carbon nanotubes with ultra-thin monolayer-type films of phosphododecamolybdic acid, H3PMo12O40, an electrode material with improved capacitance properties is produced. It is apparent from three distinct test experiments (based on cyclic voltammetry, galavanostatic charging-discharging and AC impedance) that capacitors utilizing H3PMO12O40-modified carbon nanotubes are characterized by specific capacitances and energy densities on the levels of 40 Fg(-1) and 1.3 Wh kg(-1), whereas the respective values for the systems built from bare carbon nanotubes are lower, 22 Fg(-1) and 0.7 Wh kg(-1). It is reasonable to expect that fast and reversible multi-electron transfers of the Keggin-type H3PMo12O40 account for the pseudocapacitance effect and significantly contribute to the observed overall capacitance. (c) 2007 Elsevier Ltd. All rights reserved.
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收藏
页码：3862 / 3869
页数：8
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