Sprayed polyaniline layer onto chemically reduced graphene oxide as electrode for high performance supercapacitor

Tayel, Mazhar B.; Soliman, Moataz; Ebrahim, Shaker; Harb, Mohamed E.

doi:10.1016/j.synthmet.2016.04.011

Cited by 31 publications

(6 citation statements)

References 36 publications

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“…Second, we will demonstrate that the oxidative multilayers are promising general systems for the fabrication of thin polymer-based electroactive films with high specific capacitance. Layered supercapacitors have been prepared with conducting polymers using electropolymerization and similar techniques, but there are only a few examples of the use of a true dip LbL , or spray LbL , technique. In these cases, prepolymerized polyaniline was used, although an aerogel with in situ -polymerized PEDOT sandwiched between metal oxide layers has also been reported .…”

Section: Introductionmentioning

confidence: 99%

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

et al. 2020

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The spin-spray-assisted layer-by-layer (LbL) assembly technique was used to prepare coordinative oxidative multilayers from Ce(IV), inorganic polyphosphate (PP), and graphene oxide (GO). The films consist of successive tetralayers and have a general structure (PP/Ce/GO/Ce) n . Such oxidative multilayers have been shown to be a general platform for the electrodeless generation of conducting polymer and melanin-type films. Although the incorporation of GO enhances the film growth, the conventional dip LbL method is very time consuming. We show that the spin-spray method reduces the time required to grow thick multilayers by the order of magnitude and the film growth is linear from the beginning, which implies a stratified structure. We have deposited poly(3,4-ethylenedioxothiophene), PEDOT, on the oxidative multilayers and studied these redox-active films as models for melanin-type capacitive layers for supercapacitors to be used in biodegradable electronics, both before and after the electrochemical reduction of GO to rGO. The amount of oxidant and PEDOT scales linearly with the film thickness, and the charge transfer kinetics is not mass transfer-limited, especially after the reduction of GO. The areal capacitance of the films grows linearly with the film thickness, reaching a value of ca . 1.6 mF cm –2 with 20 tetralayers, and the specific volumetric (per film volume) and mass (per mass of PEDOT) capacitances are ca . 130 F cm –3 and 65 F g –1 , respectively. 5,6-Dihydroxyindole can also be polymerized to a redox-active melanin-type film on these oxidative multilayers, with even higher areal capacitance values.

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Section: Introductionmentioning

confidence: 99%

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

et al. 2020

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“…Chemical reduction is effective for producing graphene. However, the strong reducing agents (such as hydrazine) used in this method are hazardous and toxic [ 21 , 22 ]. Consequently, several chemical reduction systems composed of safe and environmentally-friendly agents have been explored to produce graphene.…”

Section: Introductionmentioning

confidence: 99%

Porous Graphene Oxide Prepared on Nickel Foam by Electrophoretic Deposition and Thermal Reduction as High-Performance Supercapacitor Electrodes

Huang

2017

Materials

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A simple electrophoretic deposition method was developed to prepare graphene oxide (GO) films on the frameworks of nickel foam without any conductive agents and polymer binders. Then, GO was transformed into thermally-reduced graphene oxide (RGO) at an appropriate temperature. The effects of deposition voltage and thermal reduction temperature on the electrochemical properties of RGO were investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge. The appropriate combination of deposition voltage and thermal reduction temperature was established. Moreover, scanning electron microscopy, thermal gravimetric analysis, differential thermal analysis, Fourier transform infrared spectroscopy, Raman spectroscopy, and X-ray diffractometry were applied to validate the results, which showed that the highest specific capacitance of RGO was obtained when the deposition voltage was 60 V and the thermal reduction temperature was 300 °C. The specific capacitance values calculated by CV and galvanostatic charge/discharge were 139 F·g−1 (0.005 V·s−1) and 151 F·g−1 (1 A·g−1), respectively. The specific capacitance of RGO maintained 55% and 66% of the initial value when the scan rate and the current density were increased up to 0.3 V·s−1 and 10 A·g−1, respectively. RGO also displayed an excellent cycling stability by maintaining 98% of the initial specific capacitance after 500 cycles.

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“…At low scan rates, there is enough time for the electrolyte ions to inject in and extract from the electrode. 36 At the same time, with the increase of scan rate, the oxidation peak moves to positive voltage, and the reduction peak moves to negative voltage, indicating that this is a diffusion control process. 45 Based on the above mentioned investigation, the optimized preparation parameter is 30 s polymerization time and 0.8 V polymerization voltage.…”

Section: Synthesis and Characterization Of Pani/gp Compositesmentioning

confidence: 93%

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

Xiong

Wang

et al. 2021

High Performance Polymers

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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.

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Sprayed polyaniline layer onto chemically reduced graphene oxide as electrode for high performance supercapacitor

Cited by 31 publications

References 36 publications

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

Oxidative Spin-Spray-Assembled Coordinative Multilayers as Platforms for Capacitive Films

Porous Graphene Oxide Prepared on Nickel Foam by Electrophoretic Deposition and Thermal Reduction as High-Performance Supercapacitor Electrodes

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

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