One-step electrochemical preparation of graphene-coated pencil graphite electrodes by cyclic voltammetry and their application in vanadium redox batteries

Gürsu, Hürmüs; Gençten, Metin; Şahin, Yücel

doi:10.1016/j.electacta.2017.05.065

Cited by 72 publications

(145 citation statements)

References 101 publications

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“…Graphene flakes formed on the graphite electrode with the first cycle (Figure A). Increasing the oxidation and reduction peak currents by increasing the number of cycles supports the increase in the number of graphene sheets that formed on the electrode surface . The further microscopic and spectroscopic analyses also supported the modification of PGEs by nitrogen including functional groups doped graphene layers.…”

Section: Resultssupporting

confidence: 54%

“…Cyclic voltammetric treatment (50 cycles) was applied to pencil graphite electrodes (PGEs) in different ranges of potential (between of −1.0; +1.9, −0.7; +1.9, 0.5; +1.9, and 1.2; +1.9 V versus saturated calomel electrode with 50 mV/second) at 25°C, and they were named as N‐GPGE1, N‐GPGE2, N‐GPGE3, and N‐GPGE4, correspondingly (Figure ). Deionized water was used to wash off electrodes for removing impurities, and they were dried at 25°C in each electrochemical treatments …”

Section: Experimental Methodsmentioning

confidence: 99%

“…Graphene‐based materials can be used as positive electrodes with their high stability for VRFB. In our previous works, graphene‐coated electrodes were produced in 1 step using cyclic voltammetry . Prepared graphene‐based electrodes were used in positive electrolyte of VRFB as electrode materials of and they had higher electrochemical performances than that of bare electrode .…”

Section: Introductionmentioning

confidence: 99%

“…However, preparation of novel hetero atom including graphene‐coated electrodes have great potential for electrodes of VRFB. Especially, doping of graphene‐based materials such as nitro, pyridinic N, pyrrolic N, carboxyl, and hydroxyl groups by forming electrochemical active defect sides has an importance for improving electrochemical performance of positive electrode of VRFB …”

Section: Introductionmentioning

confidence: 99%

“…The preparation of hetero atom‐doped graphene‐based electrodes has added steps in all of these methods. In the preparation of graphene‐coated electrodes, the electrochemical method offers a lot of advantages like easier of use, lower economical cost, lower preparation step, and more environmentally than other methods . The immobilization of graphene‐based materials on electrode surface usually has secondary process, and the electrodes are not converted directly into an N‐doped graphene in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of N-doped graphene-based electrode via electrochemical method and its application in vanadium redox flow battery

2018

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Summary An N‐doped graphene electrode has been prepared by cyclic voltammetric method in 5.0 M of HNO3 solution on a graphite‐based electrode at room temperature. The modification of the electrode surface with different types of N‐containing groups, such as nitro groups, pyrrolic N, and pyridinic N, has been controlled by changing the scanned potential ranges. The formation of an N‐doped graphene electrode has been confirmed by scanning electron microscopic, atomic force microscopic, X‐ray photoelectron, and Raman spectroscopic methods. The prepared N‐doped graphene‐modified electrodes have been used in positive electrolyte of a vanadium‐based redox flow battery. As positive electrodes, the electrochemically modified electrodes prepared in 5.0 M of HNO3 solution −1.0 to (+1.9) and −0.7 to (+1.9) V had more than 140 and 120 mA/cm2 anodic and cathodic peak currents, respectively, in vanadium redox battery. This fast, low‐cost, and environmentally friendly method can be used in many application areas, such as optical devices, (bio)sensors, energy storage materials, and electronic devices.

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Section: Resultssupporting

confidence: 54%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Preparation of N-doped graphene-based electrode via electrochemical method and its application in vanadium redox flow battery

2018

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Preparation of sulfur‐doped graphenes by Yucel's method and their corresponding polylactide‐based nanocomposites

Kahraman

Gürsu

Arvas

et al. 2022

J of Applied Polymer Sci

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In this study, S-doped graphene (SG) powders were produced in one-step green and environmental-friendly, quick, and cheap route of Yucel's method. Different sulfur functional groups were formed on graphene surfaces by changing the anodic potential range and were first used to prepare SG/polylactide (PLA) nanocomposites. The influence of applied potential on the structural properties of SG powders was explored through cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), X-ray diffractometry (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and BET surface area analysis. S-doped graphenes were subsequently melt mixed with polylactide at low contents of 0.1 and 0.5 wt% using a twin-screw extruder. The interaction of SGs functional groups with PLA and its effect on the nanocomposites' final morphological, thermomechanical, and tensile properties was then studied. It was revealed that the tensile strength and modulus of the nanocomposites were noticeably increased with the addition of such low SGs contents. The applied potential and hence the structural properties of SGs differently influenced the final tensile properties of the nanocomposites. A maximum enhancement of around 100% in tensile strength was observed using only 0.1 wt% SG produced at the potential range of À1.5 and 2.3 V.

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Single Step Electrochemical Semi‐Exfoliated S‐Doped Graphene‐Like Structures from Commercial Carbon Fiber as Efficient Metal‐Free Catalyst for Hydrogen Evolution Reaction

et al. 2022

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The hydrogen evolution reaction (HER) is the core of electrocatalysis and plays a crucial role in water splitting to obtain hydrogen. It has been inevitable to develop metal-free catalysts in terms of sustainability, the environment, and economic feasibility. Carbon-based materials are called metal-free electrocatalysts and are regarded as one of the most promising candidates due to their abundant source, but they often show poor activity. The strategic aim of this study is to convert commercial carbon fiber into heteroatom-doped graphene-like surfaced fibers via an eco-friendly and fast intercalation/semiexfoliation mechanism called Yucel's method. Furthermore, Xray photoelectron spectroscopy (XPS) verified that the intercalation has successfully taken place and that the heteroatoms (S, O) are connected to the graphene-like structure by covalent bonds. The catalysts with 1 M H 2 SO 4 showed superior HER performance compared to bare CF.

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One-step electrochemical preparation of graphene-coated pencil graphite electrodes by cyclic voltammetry and their application in vanadium redox batteries

Cited by 72 publications

References 101 publications

Preparation of N-doped graphene-based electrode via electrochemical method and its application in vanadium redox flow battery

Preparation of N-doped graphene-based electrode via electrochemical method and its application in vanadium redox flow battery

Preparation of sulfur‐doped graphenes by Yucel's method and their corresponding polylactide‐based nanocomposites

Single Step Electrochemical Semi‐Exfoliated S‐Doped Graphene‐Like Structures from Commercial Carbon Fiber as Efficient Metal‐Free Catalyst for Hydrogen Evolution Reaction

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