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Hydrothermal synthesis and electrochemical capacitance of RuO2·xH2O loaded on benzenesulfonic functionalized MWCNTs

Authors
Journal
Electrochimica Acta
0013-4686
Publisher
Elsevier
Publication Date
Volume
55
Issue
11
Identifiers
DOI: 10.1016/j.electacta.2010.01.112
Keywords
  • Electrochemical Capacitors
  • Ruo2·Xh2O
  • Heavy Loading
  • Benzenesulfonic Mwcnts
  • Core–Shell Structure
Disciplines
  • Chemistry
  • Earth Science
  • Geography

Abstract

Abstract Amorphous RuO 2· xH 2O was well coated on the benzenesulfonic functionalized multi-wall carbon nanotubes (f-MWCNTs) successfully via hydrothermal method. The decorated benzenesulfonic groups served as a bifunctional role both for solubilizing and dispersing MWCNTs into aqueous solution and for tethering Ru 3+ precursor to facilitate the following uniform chemical deposition of RuO 2· xH 2O. The electrochemical performance of RuO 2/f-MWCNTs and utilization of RuO 2· xH 2O were evidenced by cyclic voltammetry and galvanostatic charge/discharge tests. The specific capacitance of 1143 Fg −1 for RuO 2· xH 2O was obtained from RuO 2/f-MWCNTs with 32 wt.% RuO 2· xH 2O, which was much higher than that of just 798 Fg −1 for the RuO 2/p-MWCNTs. Even though the RuO 2· xH 2O loading increases to 45 wt.%, the utilization of RuO 2· xH 2O still possesses as high as 844.4 Fg −1, indicating a good energy capacity in the case of high loading.

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