Crosslinked Carbon Nanotubes/Polyaniline Composites as a Pseudocapacitive Material with High Cycling Stability

Abstract

The poor cycling stability of polyaniline (PANI) limits its practical application as a pseudocapacitive material due to the volume change during the charge-discharge procedure. Herein, crosslinked carbon nanotubes/polyaniline (C-CNTs/PANI) composites had been designed by the in situ chemical oxidative polymerization of aniline in the presence of crosslinked carbon nanotubes (C-CNTs), which were obtained by coupling of the functionalized carbon nanotubes with 1,4-benzoquinone. The composite showed a specific capacitance of 294 F/g at the scan rate of 10 mV/s, and could retain 95% of its initial specific capacitance after 1000 CV cycles. Such high electrochemical cycling stability resulting from the crosslinked skeleton of the C-CNTs makes them potential electrode materials for a supercapacitor.

A One‐Step Chemical Strategy for the Formation of Carbon Nanotube Junctions in Aqueous Solution: Reaction of DNA‐Wrapped Carbon Nanotubes with Diazonium Salts

“…The work presented here demonstrates the possibility of tuning the formation of linear and branched carbon nanotube junctions; this is of importance and of general applicability for the sustainable fabrication of solution‐processable CNT‐based nanoscale systems and devices . Furthermore, the approach we developed can be utilised to crosslink CNTs in composite materials to potentially enhance their mechanical and/or electrical properties …”

MWCNTs-PANi nanocomposite films prepared by AC-EPD technique and its potential for enhance supercapacitor electrode

“…This pattern of CV shows redox reaction takes place for MWCNTs-PANi electrode material. The presence of PANi in the MWCNTs-PANi nanocomposite has changed the electrochemical properties of the MWCNTs since the well visible peaks typical for PANI are observed in MWCNTs-PANi respected to pseudocapacitance effect as stated by previous work [9]. Figure 5 showed the charge-discharge curve taken from 0 to 1600 seconds.…”

“…Conducting polymer will enable pseudocapacitance effect which inlvolve redox reaction between the electrode surface and the electrolyte. The MWCNTs composite with conducting polymer will then involve both EDLC separation of charges and redox reaction which will consequently enhance the specific capacitance [9].…”

“…PANi is also easily to polymerize by oxidation polymerization at relatively low temperatures and can be doped from a conducting to an insulating state using simple protonic acids [12]. PANi has been used as the supercapacitor electrode material because it has reversible control of electrical properties by both charge transfer doping and protonation [9]. PANi is a good candidate to fabricate MWCNTs composite material as PANi will complement the drawbacks of MWCNTs as supercapacitor electrode material and vice versa.…”

Frequency Dispersion of Double Layer Capacitance of Polyaniline-Coated Electrodes Under the Conducting State

“…Supercapacitors are desired to have such physical properties as a) high density of capacitance, b) high voltage, c) reversibility without heat generation, and d) the absence of leakage of current through the DL layer. Item d) is more essential from the physicochemical viewpoints than the others which have resorted practically to hybridization of polyaniline with carbons (Cheng, et al, 2013;Tayel, et al, 2016) as pseudocapacitors (Liu, et al, 2014;Gup, et al, 2015;Leary, et al, 2016;Liu, D., et al, 2015;Sarangapani, et al, 1996) and morphological variations I , II , III (Grover, et al, 2016;Chen, et al, 2013;Singu, et al, 2012). It includes two causes: one is the leakage due to time-variation of voltage through R pF (= -1/(ω 2 dC pF /dω)) and the other is due to redox reactions.…”