Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 11, Pages 3862-3869Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.11.049
Keywords
multi-walled carbon nanotubes; phosphododecamolybdate adsorbate; double-layer capacitance; redox pseudocapacitance; voltammetry; galvanostatic charging and discharging; AC impedance
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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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