Electrochemical fabrication of polyaniline/graphene paper (PANI/GP) supercapacitor electrode materials on free-standing flexible graphene paper

Abstract

Free-standing flexible supercapacitive electrodes have practical application for wearable energy storage devices. In this paper, graphene paper (GP), a flexible electrode substrate, was prepared by one-step reduction of graphene oxide (GO) using HI solution. GP can be used independently as a flexible electrode with specific capacitance of 227 F/g. In order to make up for the shortage of GP specific capacitance storage, polyaniline (PANI) with high specific capacitance and good electrical conductivity was selected to composite with GP by electrochemical polymerization approach. This method to fabricate electrode material by direct electrochemical polymerization avoids the use of conductive binder and organic solvent. Owing to the specific capacitance contribution of PANI and GP, the PANI/GP composites exhibit higher specific capacitance when the polymerization time is 30 s and the polymerization voltage is 0.8 V. At 1 A/g current density, the specific capacitance of composite is up to 759 F/g, which is 3.34 times of neat GP.

High specific surface area triphenylamine-based covalent organic framework/polyaniline nanocomposites for supercapacitor application

“…A peak at 1499 cm −1 is because of the stretching vibration of C = N. The appearance of these characteristic peaks certificate the successful preparation of TPA-COFs. In the Raman spectrum of PANI, the peak at 1587 cm −1 is associated with the stretching vibration of C-C. 33 The characteristic peak at 1350 cm −1 is associated with C–N + stretching vibration. 34 The appearance of C = N in the Raman spectrum of TPA–COFs/PANI–20 and the existence of PANI characteristic peaks further illustrate the successful preparation of composite.

Figure 3.FTIR spectra of TAPA, TFPA, TPA-COFs, PANI and TPA-COFs/PANI-20 (a), Raman spectra of TAPA, TFPA, TPA-COFs, PANI and TPA-COFs/PANI-20 (b), XRD pattern of TPA-COFs, TPA-COFs/PANI-20 and PANI (c), N 2 adsorption/desorption isotherm pattern data of TPA-COFs, TPA-COFs/PANI-15, 20 and 30 (d).

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“…A peak at 1499 cm À1 is because of the stretching vibration of C = N. The appearance of these characteristic peaks certificate the successful preparation of TPA-COFs. In the Raman spectrum of PANI, the peak at 1587 cm À1 is associated with the stretching vibration of C-C. 33 The characteristic peak at 1350 cm À1 is associated with C-N + stretching vibration. 34 The appearance of C = N in the Raman spectrum of TPA-COFs/PANI-20 and the existence of PANI characteristic peaks further illustrate the successful preparation of composite.…”

Recent research progress of conductive polymer-based supercapacitor electrode materials

“…Lv et al. 50 prepared flexible electrode substrate graphene paper (GP) by one-step reduction of graphene oxide (GO) in HI solution and prepared GP/PANI composite by electrochemical polymerization of PANI and GP. At a current density of 1.0 A g −1 , the specific capacitance of the composite could reach 759.0 F g −1 .…”

Adsorption and reduction of carcinogenic organics by ordered semi-crystalline poly-m-chloroaniline

“…Conjugated conducting polymers have attracted a lot of interest due to their various physical and chemical properties and their variety of applications. [19][20][21][22] Polyaniline (PANI) emeraldine salt contains a large amount of amine and imine functional groups with considerable quantity of positive charge, which render it as an ideal candidate for removal of anionic dye from waste water. 23 Other conjugated polymers such as poly(pyrrole), poly(thiophene) and their derivatives could be easily synthesized having porous structure, good electro rheological and non-toxicity properties.…”

“…Electron withdrawing substituted polyaniline will give positive character to the substituted PANI; as a result, this will interact with anionic dyes more than cationic dyes via electrostatic interaction and gets adsorbed on the surface of polymer. [28][29][30][31][32] There are many reports of polyaniline (PANI) to be good adsorbent for dye removal in comparison to poly(pyrrole) and poly (thiophene), [19][20][21][22] but as per our knowledge, there is no such report on absorption studies on poly-m-chloroaniline has been studied. In this paper, poly-m-chloroaniline has been synthesized by chemical oxidation using H 2 O 2 as an oxidizing agent and FeCl 2 used as a metal to provide ordering in the structure.…”