Conversion of pencil graphite to graphene/polypyrrole nanofiber composite electrodes and its doping effect on the supercapacitive properties

Sudhakar, Y.N.; Vindyashree,; Smitha, V. K.; Prashanthi,; Poornesh, P.; Ashok, Rayapuri; Selvakumar, M.

doi:10.1002/pen.24053

Cited by 11 publications

(6 citation statements)

References 30 publications

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“…The peak intensity increase after PAni addition implied that PAni polymer chains were long, rigid, and contain aromatic rings helping crystals formation of PAN during ES . A sharp characteristic graphite diffraction peak was detected at 2θ = 26.7° at PAN NF‐coated PGE corresponding to the (002) diffraction line …”

Section: Resultsmentioning

confidence: 99%

Guanine oxidation signal enhancement in single strand DNA with polyacrylonitrile/polyaniline (PAN/PAni) hybrid nanofibers

Cam

Tanik

Cerkez

et al. 2017

J of Applied Polymer Sci

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Pure polyacrylonitrile (PAN) and polyacrylonitrile/polyaniline (PAN/PAni) hybrid nanofibers (NFs) were produced via electrospinning and used to monitor guanine oxidation in single strand DNA (ssDNA) by electrochemical methods. Two different methodologies were conducted. First, pre‐synthesized PAni was added into electrospinning PAN solution and electrospun into composite PAN/PAni nanofibrous structure on cylindrical pencil graphite (PGE) surface. In the second route, PAN NFs were electrospun on a PGE surfaces and polymerization of PAni was conducted on the surfaces of the as‐spun PAN NFs. NFs were kept at −18 °C in a refrigerator for several days. ssDNA was immobilized on the prepared NFs and guanine oxidation signals were observed for each system. The results revealed that use of PAN NFs enhanced signal intensity from 0.92 µA (PGE) to 1.04 µA (PAN NFs). Addition of PAni to PAN increased signal intensity to 1.23 µA. When the PAN NF surfaces were coated with PAni, signal enhancement continued to increase up to 4.19 µA for fourth day and decreased again when PAni‐coated NFs were kept at −18 °C in the refrigerator. Since the prepared system is fast and cheap, it is promising for application in DNA biosensor devices. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45567.

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Section: Resultsmentioning

confidence: 99%

Guanine oxidation signal enhancement in single strand DNA with polyacrylonitrile/polyaniline (PAN/PAni) hybrid nanofibers

Cam

Tanik

Cerkez

et al. 2017

J of Applied Polymer Sci

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“…3. Two important string peaks were observed at 1350 cm 21 (D band) and 1580 cm 21 (G band) [12,19], which are attributed to disordered graphite structure and in-plane stretching E 2 g mode of graphite, reflecting the structural intensity of the sp 2 -hybridized carbon atoms of CMSs [20]. In addition, the G band was mainly caused by the structural defects of CMSs.…”

Section: Effect Of Annealing Temperature On Graphite Structure Of Cmssmentioning

confidence: 99%

Influence of graphitization degree of carbon microspheres on properties of PET flame retardant

Xue

Niu

Yang

et al. 2017

Polymer Engineering & Sci

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In this work, the influence of graphitization degree of carbon microspheres (CMSs) on flame retardancy of poly(ethylene terephthalate) (PET) composites was examined. The graphitized CMSs (abbreviated as, TCMSs) were prepared through an annealing treatment, and both the CMSs/PET and TCMSs/PET composites with variable filler amounts were fabricated by the melt blending method. The results suggested that the graphitization degree of CMSs played an important role in the flame retardancy of PET. On the one hand, the TCMSs acted as effective heat shields to delay the ignition time (TTI), improve the initial thermal decomposition temperature of PET, decrease the heat absorption, and enhance the limiting oxygen index (LOI) values. On the other hand, the graphitized TCMSs decreased both the peak heat release rate (PHRR) and fire risk (FGI) through the formation of a more compact crosslinked carbon layer of graphitized carbon. With the addition of 2% TCMSs, the LOI of TCMSs/PET composites increased from 21% (neat PET) to 26.3%, the PHRR value decreased from 531.90 to 332.46 kW/m2, and the residue amount increased from 9.31% to 19.31%. Compared to the CMSs, the dispersion of TCMSs in PET matrix and tensile strength of TCMSs/PET composites were also improved. Thus, these novel graphitized TCMSs show promise as efficient flame retardants for future applications. POLYM. ENG. SCI., 58:1399–1408, 2018. © 2017 Society of Plastics Engineers

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“…[1][2][3][4][5][6][7][8] The high porosity and surface area make nanofibrous structures promising materials to be used as electrodes in energy storage devices. [9][10][11] Due to their unique morphology, freestanding carbon nanofiber (CNF) electrodes provide reduced lithium-ion path length, which results in high rate capability compared to commercial electrodes. 9,12 CNFs can be obtained from various synthetic or natural precursors such as pitch, phenolic resins, polyacrylonitrile (PAN), polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA), lignin, and cellulose.…”

Section: Introductionmentioning

confidence: 99%

Poly (vinyl alcohol) based carbon nanofibers as freestanding anodes for lithium‐ion batteries

Pampal,

Stojanovska,

Kilic

et al. 2024

Polymer Engineering & Sci

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In this study, we investigated the iodination process for the preparation of water‐soluble polyvinyl alcohol (PVA)‐based carbon nanofibers (CNFs) and their electrochemical properties. Iodinated nanofibers were carbonized at different temperatures (600°C, 800°C) under an argon (Ar) atmosphere. Morphology and physical properties of fiber mats were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, and thermogravimetric analysis (TGA), while electrical conductivity measurements were done using four probes. As a freestanding anode in half‐cell lithium batteries, the CNFs were prepared by electrospinning of PVA and PVA–CNT blend, which was exposed to iodine vapor at various temperatures (60, 80, and 100°C). Iodine vapor treatment at 80°C and subsequent carbonization at 800°C provided a 29% carbon yield. The resulting CNT‐containing optimized CNFs exhibited superior flexibility, electrical conductivity (2.16 S/cm), and handleability, making them a promising, binder‐free environmentally friendly carbon source for lithium‐ion batteries with high capacity (672 mAh/g at 50 mA/g). The study clearly showed that PVA might be an alternative precursor for the production of carbon micro‐ and nanofibers.Highlights Anodic performance of PVA‐based carbon nanofibers was analyzed. PVA precursor offers economic and environmental option for binder‐free electrodes. PVA–CNT composite nanofibers with optimized iodination and carbonization time identified as a promising high carbon yield carbon source for lithium‐ion batteries. CNT‐containing optimized carbon nanofibers exhibited superior flexibility and electrical conductivity (2.16 S/cm). Freestanding fiber anodes exhibited a higher capacity of 672 mAh/g, at 50 mA/g compared to conventional graphite anode (372 mAh/g).

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Conversion of pencil graphite to graphene/polypyrrole nanofiber composite electrodes and its doping effect on the supercapacitive properties

Cited by 11 publications

References 30 publications

Guanine oxidation signal enhancement in single strand DNA with polyacrylonitrile/polyaniline (PAN/PAni) hybrid nanofibers

Guanine oxidation signal enhancement in single strand DNA with polyacrylonitrile/polyaniline (PAN/PAni) hybrid nanofibers

Influence of graphitization degree of carbon microspheres on properties of PET flame retardant

Poly (vinyl alcohol) based carbon nanofibers as freestanding anodes for lithium‐ion batteries

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