Abstract:Composites of polythiophene (PT) and graphene (GR) with different mass proportions were studied for their application as supercapacitors. Fourier transform infrared spectroscopy (FTIR) along with High Resolution Scanning electron microscopy (HR-SEM) were employed in order to characterize the morphology and composition of the resulting composites. The electrochemical behaviour of these composites was studied by means of cyclic voltammetry and specific capacitance curves were derived from these measurements. The… Show more
“…Furthermore, it was also shown that the capacitive property of MnO 2poly(o-aminophenol) is higher relative to the poly(o-aminophenol), and the composite was used as a promising material in supercapacitors. Melo et al [225] reported the preparation of the graphene/polythiophene (GR/PT) composite via the spray coating technique. The composite exhibited a higher specific capacitance of (365 F/g at 1 A g −1 ) relative to the single components and employed as electrode material in supercapacitors.…”
Section: Functionalization With Polymersmentioning
Supercapacitors (SCs) have received much interest due to their enhanced electrochemical performance, superior cycling life, excellent specific power, and fast charging–discharging rate. The energy density of SCs is comparable to batteries; however, their power density and cyclability are higher by several orders of magnitude relative to batteries, making them a flexible and compromising energy storage alternative, provided a proper design and efficient materials are used. This review emphasizes various types of SCs, such as electrochemical double-layer capacitors, hybrid supercapacitors, and pseudo-supercapacitors. Furthermore, various synthesis strategies, including sol-gel, electro-polymerization, hydrothermal, co-precipitation, chemical vapor deposition, direct coating, vacuum filtration, de-alloying, microwave auxiliary, in situ polymerization, electro-spinning, silar, carbonization, dipping, and drying methods, are discussed. Furthermore, various functionalizations of SC electrode materials are summarized. In addition to their potential applications, brief insights into the recent advances and associated problems are provided, along with conclusions. This review is a noteworthy addition because of its simplicity and conciseness with regard to SCs, which can be helpful for researchers who are not directly involved in electrochemical energy storage.
“…Furthermore, it was also shown that the capacitive property of MnO 2poly(o-aminophenol) is higher relative to the poly(o-aminophenol), and the composite was used as a promising material in supercapacitors. Melo et al [225] reported the preparation of the graphene/polythiophene (GR/PT) composite via the spray coating technique. The composite exhibited a higher specific capacitance of (365 F/g at 1 A g −1 ) relative to the single components and employed as electrode material in supercapacitors.…”
Section: Functionalization With Polymersmentioning
Supercapacitors (SCs) have received much interest due to their enhanced electrochemical performance, superior cycling life, excellent specific power, and fast charging–discharging rate. The energy density of SCs is comparable to batteries; however, their power density and cyclability are higher by several orders of magnitude relative to batteries, making them a flexible and compromising energy storage alternative, provided a proper design and efficient materials are used. This review emphasizes various types of SCs, such as electrochemical double-layer capacitors, hybrid supercapacitors, and pseudo-supercapacitors. Furthermore, various synthesis strategies, including sol-gel, electro-polymerization, hydrothermal, co-precipitation, chemical vapor deposition, direct coating, vacuum filtration, de-alloying, microwave auxiliary, in situ polymerization, electro-spinning, silar, carbonization, dipping, and drying methods, are discussed. Furthermore, various functionalizations of SC electrode materials are summarized. In addition to their potential applications, brief insights into the recent advances and associated problems are provided, along with conclusions. This review is a noteworthy addition because of its simplicity and conciseness with regard to SCs, which can be helpful for researchers who are not directly involved in electrochemical energy storage.
“…For the CV curves of pristine P3HT shown in Fig. 5 a, the current increases with scan rate and maintains the shape of CV curves, suggesting that there is a good rate of the capability 43 . Figure 5 ( a ) CV curves of P3HT at different scan rates, ( b ) CV curves of P3HT/SWCNTs electrodes with different SWCNTs ratios at 50 mV s −1 and ( c ) CV curves of P3HT/50% SWCNTs at different scan rates .…”
The aim of this work is to fabricate supercapacitor electrode based on poly (3-hexyl-thiophene-2, 5-diyl) (P3HT) and single-walled carbon nanotubes (SWCNTs) nanocomposites with different ratios onto a graphite sheet as a substrate with a wide voltage window in nonaqueous electrolyte. Structural, morphological and electrochemical properties of the prepared nanocomposites of P3HT/SWCNTs were studied and discussed. The electrochemical properties included cyclic voltammetry (CV), galvanostatic charging-discharging (GCD), and electrochemical impedance spectroscopy (EIS) were investigated. The obtained results indicated that P3HT/SWCNTs nanocomposite possesses higher specific capacitance than that present in its individual component. The high electrochemical performance of the nanocomposite was due to formation of microporous structure which facilitates ions diffusion and electrolyte penetration in these pores. The morphological micrographs of the purified SWCNTs had buckypaper structure while the photomicrographs of P3HT/SWCNTs showed that SWCNTs appear behind and front of the P3HT nanospheres. The specific capacitance of 50% SWCNTs at 0.5 Ag−1 was found to be 245.8 Fg−1 compared with that of pure P3HT of 160.5 Fg−1.
“…63 The scatter plots of reduced density gradient (RDG) versus the second largest eigenvalue of the Hessian matrix of electron density functions are obtained by Multiwfn 3.6 program. 64,65 composites contain low percentage of graphene, so a model should be such which corresponds to actual composite. Therefore, sandwich structures are considered where one or two oligothiophene chains are placed on either side of the graphene nanosheet or nanoribbon.…”
Section: Computational Detailsmentioning
confidence: 99%
“…The composites with increasing concentration of graphene are also reported. 65 The concentration of graphene changes the optical properties of composites. The concentration of graphene is increased by using graphene nanoribbons containing 38, 46, and 54 carbon atoms.…”
Graphene/polythiophene composites are widely used in a variety of optoelectronic devices and applications, e.g., as electrode materials in capacitors and solar cells, but the detailed molecular-level relationship between their structural and electronic properties is not well understood. We present a density functional theory study of these composites using model systems consisting of graphene nanosheets and nanoribbons sandwiched between oligothiophenes (up to 13 monomers in length). These systems are investigated by computing optical band gaps, UV− visible spectra, densities of states, and by analyzing noncovalent interactions in terms of the reduced density gradient. Frontier molecular orbital analysis reveals a significant decrease in the optical band gap upon increasing the concentration of graphene, which can be tuned by adjusting the proportion of graphene using larger nanoribbons. This finding has implications for device design in these materials.
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