Electrochemical oxidation of multi-walled carbon nanotubes and its application to electrochemical double layer capacitors

Ye, Jianshan; Liu, Xiao; Cui, Han; Zhang, Wei-De; Sheu, Fwu‐Shan; Lim, Tit Meng

doi:10.1016/j.elecom.2005.01.008

Cited by 181 publications

(57 citation statements)

References 42 publications

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“…10,11 Among these materials, carbon nanotubes (CNTs) have been considered ideal for electrochemical capacitors, owing to the advantages such as accessible surface area, excellent electronic conductivity, and good stability. [12][13][14][15][16][17] On the other hand, CNT grows the polarization when CNT electrode reacts with electrolyte through the electrode/electrolyte interface. Generally, polarization is the change of potential of an electrode from its equilibrium potential upon the application of a current.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Kim¹,

Kim²,

Morita

et al. 2010

Bulletin of the Korean Chemical Society

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To reduce polarization of electrochemical capacitor based on carbon nanotube, titanium oxide nanoparticles were deposited by ultrasound. The pore distribution of TiO2/CNT nanoparticle exhibited surface area of 341 m 2 g -1 when TiO2 content was 4 wt %, which was better than that of pristine CNT with surface area of 188 m 2 g -1 . The analyses indicated that titanium oxide (particle diameter < 20 nm) was deposited on the CNT surface. The electrochemical performance was evaluated by using cyclic voltammetry (CV), impedance measurement, and constant-current charge/discharge cycling techniques. The TiO2/CNT composite electrode showed relatively better electrochemical behaviors than CNT electrode by increasing the specific capacitance from 22 Fg -1 to 37 Fg -1 in 1 M H2SO4 solution. A symmetric cell assembled with the composite electrodes showed the specific capacitance value of 11 Fg -1 at a current loading of 0.5 mAcm -2 during initial cycling.

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Section: Introductionmentioning

confidence: 99%

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Kim¹,

Kim²,

Morita

et al. 2010

Bulletin of the Korean Chemical Society

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“…In general, it was observed that the current density on ozonetreated N-MWCNT film is about 7% greater of that of the untreated film. The results suggest that the treatment of N-MWCNT film with ozone increases its specific area upon cutting off (opening) the nanotube tips by the oxidation process [47]. Complementary information concerning the electrochemical response of either the untreated or ozone-treated N-MWCNT films towards [Fe(CN) 6 ] 3À/4À was obtained from EIS measurements.…”

Section: Resultsmentioning

confidence: 94%

Influence of ozone on N-doped multi-walled carbon nanotubes

Tsierkezos

Ritter

2012

Journal of Experimental Nanoscience

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Nitrogen-doped multi-walled carbon nanotubes (N-MWCNT) were selectively grown on oxidised silicon substrate by means of catalytic chemical vapour deposition with decomposition of acetonitrile in the presence of ferrocene (FeCp 2 ) at 900 C. The synthesised N-MWCNT film was initially treated with continuous ozone flow for various time periods and characterised by means of scanning electron microscopy and Raman spectroscopy. The electrochemical response of ozone-treated N-MWCNT film towards ferrocyanide/ferricyanide, [Fe(CN) 6 ] 3À/4À redox couple was investigated by means of cyclic voltammetry (CV) and electrochemical impedance spectroscopy. The results were compared with those obtained for untreated N-MWCNT film. The findings reveal the occurrence of structural defects on surface of ozone-treated N-MWCNT film due to oxidation of nanotubes. Furthermore, the handling of N-MWCNT film with ozone increases the barrier for interfacial electron transfer and slows down the kinetics of redox reaction occurring on this particular electrode.

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“…It has been reported that CNTs with structural defects exhibit the higher gravimetric capacitance than purified and defectfree ones [18,22]. The capacitance of CNFs/CNTs can be enhanced through development of their surface area by chemical activation [23] and air treatment [24] or the introduction of oxygen and nitrogen functional groups into their surface to provide pseudocapacitance [25][26][27]. Their superior conductive properties make CNFs/CNTs very attractive as percolating additives in activated carbonbased electrodes of supercapacitors [28][29][30][31], conducting supports of metallic oxides [32,33] and excellent components of carbon/carbon composites [17,34,35].…”

Section: Introductionmentioning

confidence: 99%

Influence of structural and textural parameters of carbon nanofibers on their capacitive behavior

2015

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Herringbone, platelet, and tubular carbon nanofibers (CNFs) were synthesized by catalytic chemical vapor deposition using methane, propane, and ethylene as carbon precursors. Alumina-supported nickel and iron catalysts were used for the syntheses. The resultant CNFs were characterized by scanning electron microscopy, transmission electron microscopy, and nitrogen sorption at 77 K. The performance of a CNF-based supercapacitor working in 6 mol L -1 KOH was analyzed using cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy techniques. The Brunauer-Emmett-Teller (BET) surface area of the CNFs ranged between 150 and 296 m 2 g -1 . An increase in the CNF diameter was accompanied by a decrease in the BET surface area. A comparison of the porous textures and the structure types of the CNFs demonstrated that the performance of the CNF-based supercapacitor is enhanced primarily by the exposed edges of the graphitic layers on the CNF surface, followed by the specific surface area. Among the studied CNFs, the highest capacitance value, 26 F g -1 at 0.2 A g -1 , was obtained for the platelet-type CNFs.Tubular CNFs exhibited the lowest capacitance value, which increased from 4 to 33 F g -1 at 0.2 A g -1 upon air treatment at 450°C. The presence of exposed graphitic edges on the air-treated CNT surface and an increase in the specific surface area are considered to be responsible for the enhancement of the capacitor performance.

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Electrochemical oxidation of multi-walled carbon nanotubes and its application to electrochemical double layer capacitors

Cited by 181 publications

References 42 publications

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Preparation and Electrochemical Performance of CNT Electrode with Deposited Titanium Dioxide for Electrochemical Capacitor

Influence of ozone on N-doped multi-walled carbon nanotubes

Influence of structural and textural parameters of carbon nanofibers on their capacitive behavior

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