Studies on Conducting Polypyrrole/Graphene Oxide Composites as Supercapacitor Electrode

“…At temperatures higher than 560°C, no further change is observed in the mass of the prepared RGO gel material. GO composites have been previously reported to demonstrate various weight retention ratios at a high temperature range, mainly due to the change in the self-assembly of the 3D porous carbon composites [37]. In the present study, the as-prepared composite materials clearly exhibit enhanced thermal stability in comparison with pristine GO.…”

Section: Articlesmentioning

confidence: 48%

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

et al. 2015

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(Zhang Q)) ty, and strong mechanical strength [13−16]. For example, Banerjee et al. [17,18] successfully achieved the preparation of various hydrogels that can be used as dye-adsorbing agents in waste-water removal. In addition, this group has also reported metal-nanoparticle-containing GObased hydrogels and novel morphological transformation of graphene based nanohybrids [19−21]. Generally, GObased composite hydrogels were obtained by mixing organic macromolecules or small amphiphiles with an aqueous GO dispersion [22−24]. Chitosan (CS), a well-known compound of chitin N-deacetylation, shows many eco-friendly properties, such as biodegradation, good biocompatibility, and antifungal activity. These characteristics make it a promising candidate in the fields of catalysis, materials, food, drugs, etc. [25−27]. Since GO crosslinks with chitosan via the carboxyl, hydroxyl, epoxy, and amine groups of chitosan, the adsorption capacity of the formed composite is expected to be high. To date, some reports have been published on GO-chitosan nanocomposites used for drug release and antimicrobial activity [28−32].In this study, we report the preparation of GO-based composite hydrogels using the self-assembly of CS and GO, and an in situ reduction approach. The composite hydrogels consist of both hydrogen bonding and electrostatic interactions between the CS molecules and GO sheets. CS molecules were incorporated to facilitate the gelation process of GO sheets, and the dye adsorption capacity of the hydrogel was mainly attributed to the GO sheets. For the three dyes tested in this study, namely, Congo red (CR), methylene blue (MB), and Rhodamine B (RhB), the as-prepared composite hydrogels exhibit good removal rates in accordance with the pseudo-second-order model. More importantly, the hydrogels prepared in this study have potential large-scale applications in organic dye removal and Graphene oxide (GO)-chitosan composite hydrogels were successfully prepared via the self-assembly of chitosan molecules and GO . These as-prepared hydrogels were characterized by different techniques. The morphology of the internal network structure of the nanocomposite hydrogels was investigated. The adsorption capacity results demonstrate that the prepared GObased composite hydrogels can efficiently remove three tested dye molecules, Congo red, methylene blue and Rhodamine B, from wastewater in accordance with the pseudo-second-order model. The dye adsorption capacity of the obtained hydrogels is mainly attributed to the GO sheets, whereas the chitosan molecule was incorporated to facilitate the gelation process of the GO sheets. The present study indicates that the as-prepared composite hydrogels can serve as good adsorbents for wastewater treatment as well as the removal of harmful dyes.

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“…For this purpose, a series of PPY-GO nanocomposites (PNCs) was prepared at 30 ± 1°C and 10 ± 1°C, through the cetyltrimethylammonium bromide (CTAB) assisted dilute-solution polymerization of pyrrole in the presence of different concentrations of GO (wt%) ranging from 1.0 to 4.0 with ferric chloride as an oxidant. The investigation demonstrates that PNCs prepared in the presence of a low percentage of GO at temperatures of 10 ± 1°C rendered a dramatic enhancement in their specific capacitance over those prepared at 30 ± 1°C [20][21][22][23]. The prepared PPY and respective PNCs were characterized through Fourier-transform infrared (FT-IR) spectrography, their X-ray diffraction (XRD) spectra, scanning electron microscopy (SEM) and simultaneous thermogravimetry-differential scanning calorimetry (TG-DSC).…”

Section: Preparation Of the Electrodesmentioning

confidence: 95%

“…Such a spherical morphology accounts for the satisfactory electrochemical activity of PPY [39]. The stark contrast between the respective images clearly shows that new PNCs were materialized through the intercalation of PPY in the gallery spacing of GO [21] (Fig. 4c). CV is attributed to the restricted diffusion of the charge, which induces a reduction in Cs and a high power density of PNCs.…”

Section: Electrochemical Behaviormentioning

confidence: 99%

Enhanced electrocapacitive performance and high power density of polypyrrole/graphene oxide nanocomposites prepared at reduced temperature

Mudila¹,

Joshi²,

Rana³

et al. 2014

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An attempt was made to investigate the effect of the preparation temperature on the electrocapacitive performance of polypyrrole (PPY)/graphene oxide (GO) nanocomposites (PNCs). For this purpose, a series of PNCs were prepared at various temperatures by the cetyltrimethylammonium bromide-assisted dilute-solution polymerization of pyrrole in presence of GO (wt%) ranging from 1.0 to 4.0 with ferric chloride as an oxidant. The formation of the PNCs was ascertained through Fourier-transform infrared spectrometry, X-ray diffraction spectra, scanning electron microscopy and simultaneous thermogravimetric-differential scanning calorimetry. The electrocapacitive performance of the electrodes derived from sulphonated polysulphone-bound PNCs was evaluated through cyclic voltammetry with reference to Ag/ AgCl at a scan rate (V/s) ranging from 0.2 and 0.001 in potassium hydroxide (1.0 M). The incorporation of GO into the PPY matrix at a reduced temperature has a pronounced effect on the electrocapacitive performance of PNCs. Under identical scan rates (0.001 V/s), PNCs prepared at 10 ± 1°C render improved specific conductivity (526.33 F/g) and power density (731.19 W/Kg) values compared to those prepared at 30 ± 1°C (217.69 F/g, 279.43 W/Kg). PNCs prepared at 10 ± 1°C rendered a capacitive retention rate of ~96% during the first 500 cycles. This indicates the excellent cyclic stability of the PNCs prepared at reduced temperatures for supercapacitor applications.

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Studies on Conducting Polypyrrole/Graphene Oxide Composites as Supercapacitor Electrode

Cited by 160 publications

References 21 publications

Poly(ionic liquids) functionalized polypyrrole/graphene oxide nanosheets for electrochemical sensor to detect dopamine in the presence of ascorbic acid

Poly(ionic liquids) functionalized polypyrrole/graphene oxide nanosheets for electrochemical sensor to detect dopamine in the presence of ascorbic acid

Preparation and adsorption capacity evaluation of graphene oxide-chitosan composite hydrogels

Enhanced electrocapacitive performance and high power density of polypyrrole/graphene oxide nanocomposites prepared at reduced temperature

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