Green synthesis of reduced graphene oxide paper using Zn powder for supercapacitors

Li, Yongfeng; Liu, Yanzhen; Zhang, Weike; Guo, Chun-Yao; Chen, Cheng-Meng

doi:10.1016/j.matlet.2015.05.114

Cited by 43 publications

(2 citation statements)

References 15 publications

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“…Rath et al synthesized rGO paper via vacuum filtration of GO suspension and subsequent reduction using hydriodic acid (HI) (55%) and obtained the specific capacitance (SC) of ~ 80 Fg −1 at 0.5 Ag −1 [21]. Li et al documented the SC of 130 Fg −1 at 0.1 Ag −1 for the rGO paper prepared by vacuum filtration of GO aqueous suspension followed by reduction via Zn powder in ammonia solution [22]. Further, Hu et al synthesized rGO paper by vacuum filtration of GO aqueous dispersion and subsequent electrochemical reduction.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

Kumar

Sharma

et al. 2019

Nanoscale Res Lett

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Herein, we report a novel, simple, and cost-effective way to synthesize flexible and conductive rGO and rGO/MWCNT freestanding films. The effects of MWCNT addition on the electrochemical performance of rGO/MWCNT nanocomposite films are investigated in some strong base aqueous electrolytes, such as KOH, LiOH, and NaOH via three-electrode system. The supercapacitor behavior of the films is probed via cyclic voltammetry, galvanostatic charging-discharging, and electrochemical impedance spectroscopy. The structural and morphological studies of the films are performed by X-ray diffractometer, Raman spectrometer, surface area analyzer, thermogravimetric analysis, field emission scanning electron microscope and transmission electron microscope. The rGO/MWCNT film synthesized with 10 wt% MWCNTs (GP10C) exhibits high specific capacitance of 200 Fg −1 , excellent cyclic stability with 92% retention after 15,000 long cycle test, small relaxation time constant (~ 194 ms), and high diffusion coefficient (7.8457 × 10 −9 cm 2 s −1 ) in 2 M KOH electrolyte. Furthermore, the symmetric supercapacitor coin cell with GP10C as both anode and cathode using 2 M KOH as electrolyte demonstrates high energy density of 29.4 Whkg −1 and power density of 439 Wkg −1 at current density 0.1 Ag −1 and good cyclic stability with 85% retention of the initial capacitance at 0.3 Ag −1 after 10,000 cycles. Such a high performance of the GP10C film in the supercapacitor can be ascribed to the large surface area and small hydration sphere radius and high ionic conductivity of K + cations in KOH electrolyte.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

Kumar

Sharma

et al. 2019

Nanoscale Res Lett

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“…Therefore, there was a growing demand to find an alternative facile green chemistry route for reduced GONSs fabrication. Diverse new and eco-friendlier reducing agents such as vitamin C, , amino acids, alkyl amines, sugar, glucose, bovine serum albumin, hydrogen-rich water, metal nanoparticles and powders, supercritical alcohols, polyphenols of green tea, , ginseng, bacteria, , baker’s yeast, wild carrot root, and phytoextract were reported as potential replacements of the toxic reductants. Apart from this, a few other sustainable methods to fabricate reduced GO nanosheets were flash photo reduction, laser reduction, and catalytic and photocatalytic − methods.…”

Section: Introductionmentioning

confidence: 99%

Natural Honeycomb Flavone Chrysin (5,7-dihydroxyflavone)-Reduced Graphene Oxide Nanosheets Fabrication for Improved Bactericidal and Skin Regeneration

Sathishkumar

Palanisamy

Jha

et al. 2017

ACS Sustainable Chem. Eng.

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Functionalization of biocompounds on a nanomaterials surface will decrease their detrimental side effects and escape them from immunological rejection. In this study, we developed a sustainable green chemistry route to fabricate natural honeycomb flavone chrysin (5,7-dihydroxyflavone ChR)-reduced graphene oxide nanosheets (ChR-rGONSs) using a simple experimental setup. The hydroxyl (O–H) functional group of ChR wires the reduction and generation of functionalized ChR-rGONSs, and it was characterized through Raman, Fourier transform infrared (FT-IR), and X-ray photo electron (XPS) spectroscopic analyses. Effective reduction of graphene oxide (GO) into ChR-rGONSs was further revealed with X-ray diffraction (XRD), atomic force microscope (AFM), and field emission scanning electron microscopic (FE-SEM) measurements. Using the high resolution transmission electron microscopic (HR-TEM) images, zeta potential, and energy dispersive X-ray spectroscopic (EDAX) analyses, we have shown the fine morphological features, surface charge, and stableness of fabricated ChR-rGONSs. Thermo-stable properties of ChR-rGONSs were much greater than ChR and GO. In a disc diffusion study, the ChR-rGONSs showed an excellent inhibitory action against 11 bacterial pathogens comparatively with raw graphite (G), free ChR, and GO, which clearly depicts their enhanced antimicrobial value. Moreover, in vivo studies proved that the ChR-rGONSs promote rapid skin regeneration and wound closure action compared with other treatments such as raw-G, GO, and free ChR. The ChR-rGONSs exhibited no signs of toxicity against treated animal models and also causes less RBCs lysis, which represents their biocompatibility for direct wound dressing and other regenerative medicine applications.

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Utilizing Graphene Oxide (GO) Catalysed Cascade in the Synthesis of Tetracyclic Pyrano[3,4‐b]indole Derivatives

et al. 2023

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A simple, highly effective synthesis of tetracyclic pyrano[3,4‐b]indoles derivatives from simple 2‐indolylmethanols and trione alkenes has been accomplished through oxa‐Michael addition‐Friedel–Crafts reaction‐cyclization cascade promoted by a cheap and green graphene oxide catalyst. Under mild conditions, the reaction afforded a range of pyrano[3,4‐b]indole scaffolds, which are an important structural unit of different bioactive molecules, in excellent yields. Most importantly, in the cascade reaction of 2‐indolylmethanols with trione alkenes, the nanocatalyst not only activates trione alkene substrates by forming hydrogen‐bonding, but also promotes the following intramolecular ring formation and dehydration. Moreover, graphene oxide showed high recyclability in this reaction and could be used in gram scale synthesis. To the best of our knowledge, graphene oxide is used for the first time in the synthesis of functionalized tetracyclic dihydropyranoindole derivatives.

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Green synthesis of reduced graphene oxide paper using Zn powder for supercapacitors

Cited by 43 publications

References 15 publications

Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

Synthesis of Free-Standing Flexible rGO/MWCNT Films for Symmetric Supercapacitor Application

Natural Honeycomb Flavone Chrysin (5,7-dihydroxyflavone)-Reduced Graphene Oxide Nanosheets Fabrication for Improved Bactericidal and Skin Regeneration

Utilizing Graphene Oxide (GO) Catalysed Cascade in the Synthesis of Tetracyclic Pyrano[3,4‐b]indole Derivatives

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