Capacitance Enhancement by Incorporation of Functionalised Carbon Nanotubes into Poly(3,4-Ethylenedioxythiophene)/Graphene Oxide Composites

Abstract

This paper reports on the role of oxidised carbon nanotubes (oxMWCNTs) present in poly-3,4-ethylenedioxytiophene (PEDOT)/graphene oxide (GOx) composite. The final ternary composites (pEDOT/GOx/oxMWCNTs) are synthesised by an electrodeposition process from the suspension-containing monomer, oxidised carbon nanotubes and graphene oxide. Dissociated functional groups on the surface of graphene oxide play a role of counter-ions for the polymer chains. Detailed physicochemical and electrochemical characterisation of the ternary composites is presented in the paper. The results prove that the presence of oxMWCNTs in the ternary composites doubles the capacitance values compared to the binary ones (450 vs. 270 F cm−3 for PEDOT/GOx/oxMWCNTs and PEDOT/GOx, respectively). The amount of carbon nanotubes in the synthesis solution is crucial for physicochemical properties of the composites, their adhesion to the electrode substrate and the electrochemical performance.

Effect of graphene on the mechanical and electrochemical properties of GLARE

“…The specific capacitance values corresponding to the scan rates of 40, 80 and 100 mV/s are 1.76, 2.47 and 2.88 F/g, respectively. Although this value is lower than that of supercapacitors [36,46], certain electrochemical characteristics are still detected. A particle tunnelling model explains why conductive nanoparticles form a conductive network in a polymer to improve conductivity [47][48].…”

“…Signals were collected through an electrochemical workstation. Specific capacitance was calculated as follows [36].…”

Improved NO2 Gas-Sensing Performance of an Organic Field-Effect Transistor Based on Reduced Graphene Oxide-Incorporated Nanoporous Conjugated Polymer Thin Films

“…The O 1s spectra of the bare rGO film were composed of three peaks with binding energies of ∼530.28, ∼531.58, and ∼532.38 eV, corresponding to CO, O–CO, and O–H/C–O bonds, respectively. , In P-PTPS7, the peaks of the CO, O–CO, and O–H/C–O bonds appeared to be shifted to higher binding energies of ∼530.58, ∼531.78, and ∼532.48 eV, respectively. This peak shift indicates that the oxygen functional groups of rGO, such as CO, O–CO, and O–H/C–O bonds, are involved in the interaction with P3HT. , In the C 1s spectra of the rGO film, C–C/CC, C–O, CO, and O–CO bonds were observed at binding energies of ∼283.28, ∼284.08, ∼285.28, and ∼287.98 eV, respectively. , In P-PTPS7, the C–S bond generated by the interaction between the C of rGO and the S of P3HT appeared to merge with the CO bond, resulting in a single peak at ∼285.78 eV. In addition, the O–CO bond peak shifted to a higher binding energy, at ∼288.18 eV, owing to the higher number of oxygen groups interacting with P3HT.…”

“…83,84 In the C 1s spectra of the rGO film, C−C/C�C, C−O, C�O, and O−C�O bonds were observed at binding energies of ∼283.28, ∼284.08, ∼285.28, and ∼287.98 eV, respectively. 82,85 In P-PTPS7, the C−S bond generated by the interaction between the C of rGO and the S of P3HT appeared to merge with the C�O bond, resulting in a single peak at ∼285.78 eV. In addition, the O−C�O bond peak shifted to a higher binding energy, at ∼288.18 eV, owing to the higher number of oxygen groups interacting with P3HT.…”