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.

引用

页码：3862 / 3869

页数：8

共 36 条

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