Carbon nanotube/RuO2 nanocomposite electrodes for supercapacitors

Electrochemical characteristics of electrodes for supercapacitors built from RuO 2 /maltiwalled carbon nanotube (CNT) nanocomposites have been investigated. Capacitances have been estimated by cyclic voltammetry at different scan rates from 5-50 mV/s. Electrostatic charge storage as well as pseudofaradaic reactions of RuO 2 nanoparticles have been affected by the surface functionality of CNTs due to the increased hydrophilicity. Such hydrophilicity enables easy access of the solvated ions to the electrode/electrolyte interface, which increases faradaic reaction site number of RuO 2 nanoparticles. The specific capacitance of RuO 2 /pristine CNT nanocomposites based on the combined mass was about 70 F/g (RuO 2 : 13 wt % loading). and the specific capacitance based on the mass of RuO 2 was 500 F/g. However, the specific capacitance of RuO 2 /hydrophilic CNT nanocomposites based on the combined mass was about 120 F/g (RuO 2 : 13 wt % loading), and the specific capacitance based on the mass of RuO 2 was about 900 F/g.

[1]  Seong Chu Lim,et al.  Supercapacitors Using Single‐Walled Carbon Nanotube Electrodes , 2001 .

[2]  R. Gallay,et al.  Supercapacitors based on nanostructured carbon electrodes grown by cluster-beam deposition , 1999 .

[3]  K. Méténier,et al.  Electrochemical insertion of lithium in catalytic multi-walled carbon nanotubes , 1999 .

[4]  O. Park,et al.  Capacitance properties of graphite/polypyrrole composite electrode prepared by chemical polymerization of pyrrole on graphite fiber , 2002 .

[5]  J. H. Kim,et al.  The Effect of Nickel Foam Current Collector in Carbon Electrode Based Electric Double Layer Capacitor , 2001 .

[6]  Jim P. Zheng,et al.  Ruthenium Oxide‐Carbon Composite Electrodes for Electrochemical Capacitors , 1999 .

[7]  S. Bonnamy,et al.  Electrochemical storage of lithium in multiwalled carbon nanotubes , 1999 .

[8]  Ji Liang,et al.  Study of electrochemical capacitors utilizing carbon nanotube electrodes , 1999 .

[9]  Wenzhi Li,et al.  Electrochemical characterization of carbon nanotubes as electrode in electrochemical double-layer capacitors , 2002 .

[10]  X. B. Zhang,et al.  Structure and Lithium Insertion Properties of Carbon Nanotubes , 1999 .

[11]  Juhyoun Kwak,et al.  Ordered nanoporous arrays of carbon supporting high dispersions of platinum nanoparticles , 2001, Nature.

[12]  H. Nalwa.  Handbook of organic conductive molecules and polymers , 1997 .

[13]  Jim P. Zheng,et al.  High energy and high power density electrochemical capacitors , 1996 .

[14]  R. Hoch,et al.  High power electrochemical capacitors based on carbon nanotube electrodes , 1997 .

[15]  Jong‐In Hong,et al.  Conducting Polymer with Metal Oxide for Electrochemical Capacitor: Poly(3,4-ethylenedioxythiophene) RuO x Electrode , 2001 .

[16]  C. R. Martin,et al.  Carbon nanotubule membranes for electrochemical energy storage and production , 1998, Nature.

[17]  Jim P. Zheng,et al.  Hydrous Ruthenium Oxide as an Electrode Material for Electrochemical Capacitors , 1995 .

[18]  F. Béguin,et al.  Supercapacitors from nanotubes/polypyrrole composites , 2001 .

[19]  Jim P. Zheng,et al.  A New Charge Storage Mechanism for Electrochemical Capacitors , 1995 .

[20]  K. Méténier,et al.  Supercapacitor electrodes from multiwalled carbon nanotubes , 2000 .