Relevant bibliographies by topics / Graphite-Electrochemical exfoliation

Academic literature on the topic 'Graphite-Electrochemical exfoliation'

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Published: 6 September 2023

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Journal articles on the topic "Graphite-Electrochemical exfoliation"

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Grushevski, E., D. Savelev, L. Mazaletski, N. Savinski, and D. Puhov. "The scalable production of high-quality nanographite by organic radical-assisted electrochemical exfoliation." Journal of Physics: Conference Series 2086, no. 1 (December 1, 2021): 012014. http://dx.doi.org/10.1088/1742-6596/2086/1/012014.

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Abstract One of the promising ways to produce graphene is the technology of graphite splitting or exfoliation, both by physical or mechanical and chemical, including electrochemical methods. The product of electro exfoliation is nanographite, which is transformed into multigraphene at the subsequent stage of liquid-phase mechanical and ultrasonic disintegration. This approach demonstrates a successful method of obtaining multigraphene from available graphite raw materials. Since, already at a potential of 1.23V, during the electrolysis of water on a graphite anode, the hydroxyl anion is discharged with the formation of a very active hydroxyl radical oxidizer, it is not surprising that when the graphite electro exfoliation process is overvolted at 10V, graphite oxidation products are formed. In order to control the defectiveness of the graphene lattice by oxidation products, we carried out processes of graphite exfoliation in the presence of both a number of reducing agents ascorbic acid, sodium borohydride, hydrazine hydrate, and in the presence of industrial antioxidants radical traps (2,2,6,6-tetramethylpiperidine-1-il)oxyl (TEMPO), (2,2,6,6-tetramethyl-4 oxo-piperidine-1-yl)oxyl (IPON), a mixture of 5,8,9-bis isomers[(2,2,6,6-tetramethyl - 4 oxo-piperidine-1-yl)]-{5,8,9-[1,1’- bi(cyclopentylidene)]-2,2’,4,4’- tetraene}(YARSIM-0215). It should be noted, that the best result of preventing the oxidation of nanographite in electro exfoliation technology in our studies is the ratio of carbon to oxygen (C/O) about 69.
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Shah, Syed Sajid Ali, and Habib Nasir. "Exfoliation of Graphene and its Application as Filler in Reinforced Polymer Nanocomposites." Nano Hybrids and Composites 11 (October 2016): 7–21. http://dx.doi.org/10.4028/www.scientific.net/nhc.11.7.

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Recently, graphene has played a promising role due to its exceptional mechanical and thermal properties and the broad range of applications. This paper reviews the synthesis of graphene and its use as fillers in polymer nanocomposites. The nanocomposites prepared by different methods have the wide range of applications, such as in energy storage devices, biosensor applications, automotive industries and electronic industries. Graphene can be prepared by different methods, for example, mechanical exfoliation, chemical exfoliation, electrochemical exfoliation and Intercalation compound exfoliation. The electrochemical method is environmentally friendly, however, the chemical exfoliation method is cost effective and suitable for commercial production of graphene. In oxidation-reduction method, the oxidation of graphite starts at point’s defects and the temperature has great effects on oxidation of graphite, at low-temperature oxidation is sensitive to impurities and at high-temperature oxidation increases with increasing temperature. Graphene can be incorporated into the polymer matrix by different approaches, such as in situ polymerization, solution, costing method, electrodeposition, and click chemistry method.
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Hashimoto, Hideki, Yusuke Muramatsu, Yuta Nishina, and Hidetaka Asoh. "Bipolar anodic electrochemical exfoliation of graphite powders." Electrochemistry Communications 104 (July 2019): 106475. http://dx.doi.org/10.1016/j.elecom.2019.06.001.

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Bourelle, E., J. Dougiade, and A. Metrot. "Electrochemical Exfoliation of Graphite in Trifluoroacetic Media." Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 244, no. 1 (April 1994): 227–32. http://dx.doi.org/10.1080/10587259408050109.

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Nikiforov, A. A., M. S. Kondratenko, O. O. Kapitanova, and M. O. Gallyamov. "Electrochemical Exfoliation of Graphite in Supercritical Media." Doklady Physical Chemistry 492, no. 2 (June 2020): 69–73. http://dx.doi.org/10.1134/s0012501620060020.

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Destiarti, Lia, Riyanto Riyanto, Roto Roto, and Mudasir Mudasir. "Electrolyte effect in electrochemical exfoliation of graphite." Materials Chemistry and Physics 302 (July 2023): 127713. http://dx.doi.org/10.1016/j.matchemphys.2023.127713.

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Salverda, Michael, Antony Raj Thiruppathi, Farnood Pakravan, Peter C. Wood, and Aicheng Chen. "Electrochemical Exfoliation of Graphite to Graphene-Based Nanomaterials." Molecules 27, no. 24 (December 7, 2022): 8643. http://dx.doi.org/10.3390/molecules27248643.

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Here, we report on a new automated electrochemical process for the production of graphene oxide (GO) from graphite though electrochemical exfoliation. The effects of the electrolyte and applied voltage were investigated and optimized. The morphology, structure and composition of the electrochemically exfoliated GO (EGO) were probed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS), FTIR spectroscopy and Raman spectroscopy. Important metrics such as the oxygen content (25.3 at.%), defect density (ID/IG = 0.85) and number of layers of the formed EGO were determined. The EGO was also compared with the GO prepared using the traditional chemical method, demonstrating the effectiveness of the automated electrochemical process. The electrochemical properties of the EGO, CGO and other carbon-based materials were further investigated and compared. The automated electrochemical exfoliation of natural graphite powder demonstrated in the present study does not require any binders; it is facile, cost-effective and easy to scale up for a large-scale production of graphene-based nanomaterials for various applications.
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Coroş, Maria, Florina Pogăcean, Marcela-Corina Roşu, Crina Socaci, Gheorghe Borodi, Lidia Mageruşan, Alexandru R. Biriş, and Stela Pruneanu. "Simple and cost-effective synthesis of graphene by electrochemical exfoliation of graphite rods." RSC Advances 6, no. 4 (2016): 2651–61. http://dx.doi.org/10.1039/c5ra19277c.

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Lou, Fengliu, Marthe Emelie Melandsø Buan, Navaneethan Muthuswamy, John Charles Walmsley, Magnus Rønning, and De Chen. "One-step electrochemical synthesis of tunable nitrogen-doped graphene." Journal of Materials Chemistry A 4, no. 4 (2016): 1233–43. http://dx.doi.org/10.1039/c5ta08038j.

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Kurys, Ya I., O. O. Ustavytska, V. G. Koshechko, and V. D. Pokhodenko. "Structure and electrochemical properties of multilayer graphene prepared by electrochemical exfoliation of graphite in the presence of benzoate ions." RSC Advances 6, no. 42 (2016): 36050–57. http://dx.doi.org/10.1039/c6ra02619b.

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Dissertations / Theses on the topic "Graphite-Electrochemical exfoliation"

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Taheri, Najafabadi Amin. "High-yield production of graphene sheets by graphite electro-exfoliation for application in electrochemical power sources." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59330.

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This thesis first aims at developing an electrochemical approach for low temperature, simple, and cost-effective synthesis of graphene microsheets (GNs) using graphitic electrodes in ionic liquid (IL) medium. The second major focus involves the products application as cathode-modifying microporous layers (MPLs) in proton exchange membrane fuel cells (PEMFCs) as well as anode-modifying materials in microbial fuel cells (MFCs). For the electrochemical exfoliation, a novel IL/acetonitrile electrolyte is introduced, and investigated with low concentration of ionic liquids. Using iso-molded graphite rod as the anode, up to 86% of exfoliation was achieved with the majority of the products as graphene flakes in addition to smaller quantities of carbonaceous particles and rolled sheets. Moreover, the simultaneous anodic and cathodic GN production was developed here with a synergistic exfoliation effect. When graphitic anode and cathode were subjected to a constant cell potential, up to 3 times higher exfoliation yields were generated compared to single-electrode studies on each side (~6-fold improvement in total). Thorough materials characterization confirmed the production of ultrathin GNs (< 5 layers) on both electrodes, with cathodic sheets being relatively larger and less functionalized. On the application side, the successful integration of GNs in MPLs resulted in enhanced PEMFC performance over a wide range of operating conditions. GN-based MPLs improved performance in the kinetic and ohmic regions of the polarization curve, while the addition of carbon black (CB), particularly Vulcan XC72, to form a composite GN+CB MPL, further extended the improvement to the mass transport limiting region. This was reflected by an approximate 30% and 70% increase in peak power densities compared to CB and GN MPLs, respectively, at the relative humidity (RH) of 100%. Despite the presence of CB, GN+CB MPLs also retained their superior performance at a much lower RH of 20%, thereby widening the peak power gap with CB MPLs to 80%. On the other side, the functionalized GN-modified carbon cloth anodes integrated within single-chamber MFCs generated an over four-fold improvement in peak power density compared to the plain carbon cloth (2.85 W m-² vs 0.66 W m-², respectively), exceeding the previously reported values with graphene anodes.
Applied Science, Faculty of
Graduate
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Herraiz, Michael. "Graphène et fluorographène par exfoliation de graphite fluoré : applications électrochimiques et propriétés de surface." Thesis, Université Clermont Auvergne‎ (2017-2020), 2018. http://www.theses.fr/2018CLFAC094/document.

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Sa conductivité électronique ou encore sa transparence optique sont autant de propriétés physico-chimiques singulières du graphène qui expliquent le nombre accru de méthodes d’exfoliation de précurseurs graphitiques développées pour l’obtention de ce matériau. Pour palier à l’utilisation d’un oxyde de graphite/graphène caractérisé par une chimie de surface mal maitrisée, des graphites fluorés, de cristallinité mais aussi de concentration en fluor variables, ont été préparés par fluoration de graphite sous fluor moléculaire pur après optimisation des paramètres. Les précurseurs, que ce soit par fluoration dynamique ou statique, ainsi obtenus ont été caractérisés finement : diffraction des rayons X, spectroscopies IR et Raman et leur texture sondée par Microscopie Electronique à Balayage et à Transmission. Suite à cela, trois méthodes d’exfoliation ont été mises en place, basées sur des mécanismes différents : i) une exfoliation par choc thermique, déjà connue mais dont les mécanismes de décomposition ont été affinés dans cette étude, ii) une exfoliation en voie liquide, avec l’utilisation pour la première fois d’un graphite fluoré pour la synthèse de graphène fluoré multi feuillets par voie électrochimique pulsée, et enfin iii) une méthode originale, peu conventionnelle, basée sur l’interaction laser femtoseconde/graphite hautement fluoré pour induire des mécanismes de réduction contrôlée, et surtout d’exfoliation de la matrice. Ces méthodes ont permis de mettre en évidence l’intérêt de la présence de fluor dans la course actuelle pour la synthèse de graphène, et ont montré l’obtention de matériaux graphéniques,possédant une fonction résiduelle fluorée intéressante pour certaines applications
Its electronic conductivity or its optical transparency are unequaled physicochemicalproperties of graphene which explain the increased number of exfoliation methods based ongraphitic precursors to obtain this material. To overcome the use of a graphite/graphene oxidecharacterized by a poorly controlled surface chemistry, graphite fluorides, with variablecrystallinity and also fluorine concentration, were prepared by fluorination of graphite under puremolecular fluorine atmosphere after optimization of the process parameters. The obtainedprecursors, whether by dynamic or static fluorination, were characterized : X-Ray diffraction, FTIRand Raman spectroscopies for the structure, and their texture probed by Scanning andTransmission Electron Microscopy. After that, three methods of exfoliation were developed, basedon different mechanisms: i) a thermal shock, already known but decomposition mechanisms wererefined in this study, ii) an exfoliation within liquid medium by pulsed electrochemical treatment,using for the first time a fluorinated graphite for the synthesis of few-layered fluorinated grapheneand finally iii) an unconventional method, based on the interaction between femtosecond laser andhighly fluorinated graphite to induce mechanisms like controlled reduction, and especially for thisstudy exfoliation of the matrix. These methods have permit to highlight the interest of fluorine inthe current race for the synthesis of graphene, and have shown the production of graphenematerials, having an interesting fluorinated residual functionalization for some applications
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Zhang, Yubai. "Electrochemical synthesis of 2D materials and their applications in energy storage." Thesis, Griffith University, 2021. http://hdl.handle.net/10072/410071.

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2D materials have inspired the intrigue of researchers and industries for its potential to improve the performance of existing materials in energy storage field. However, wide application of 2D material such as graphene and transition metal dichalcogenides in batteries is not implemented since the tremendous challenges and issues, the quality, quantity, and cost concerns impede its commercialization. Electrochemical approach performs as a controllable and scalable method for exfoliating, expanding, and functionalizing the pristine bulk materials on-demand. Sodium ion batteries, a promising candidate for lithium ion batteries, and aqueous zinc ion batteries, a safe energy storage system have received considerable attention in recent decades. The research herein focuses on the electrochemical exfoliation of graphite for its application in sodium ion battery anode, adopting the electrochemical graphene oxide (EGO) as functional agent combining with vanadium oxide for aqueous zinc ion battery cathode, and electrochemical production of molybdenum disulfide in a packed bed reactor. The PhD thesis generally is composed of three parts. In the first part, graphite is exfoliated and oxidized in a packed bed reactor. The effects of boron doping and oxidation on the graphene-based material were studied for high performance sodium ion battery anode respectively in Chapter 2 and Chapter 3. The electrochemical route from natural graphite to graphene oxide is investigated in terms of concentration of acid electrolyte (sulfuric acid). It was found that 12 M sulfuric acid reacted graphene oxide could deliver higher capacity of sodium ion battery than other concentrations. Boron doped graphene was synthesized by a twostep reaction, electrochemical fabrication of the tetraborate anions intercalated graphite oxide followed by reduction by annealing at 900 °C for 3 h under Ar gas. It was found that the boron doped graphene containing 0.21 at. % of boron was highly defective delivers a good capacity of 129.59 mAh g-1 at the current density of 100 mA g-1 and a long-term cyclic stability under current density of 500 mA g-1 retaining 100.20 mA g-1 after 800 cycles. The battery performance of boron doped graphene is better than that without boron doping. To further improve the sodium ion battery anode performance, mildly reduced graphite oxide with layered structure was synthesized by a simple electrochemical oxidation of expanded graphite followed by mildly heating reduction as reported in Chapter 3. The irrigated pipe in the expanded graphite packed bed assists with diffusion of electrolyte. A fast thermal reduction at 150 °C for 20 min on the electrochemical graphite oxide achieves a controlled deoxygenation and maintaining of the large interlayer gap of the product for high sodium storage capacity. The thermally processed electrochemically produced graphite oxide could deliver a high reversible capacity of 268 mAh g-1 at a current density of 100 mA g-1, and 163 mAh g-1 at a high current density of 500 mA g-1 and a good capacity retaining capability (in average 0.0198% loss per cycle) over 2000 cycles. In the second part, the EGO was integrated with vanadium oxide as cathode material for aqueous zinc ion battery. A simple spray dry method is applied to generate electrode materials, which is catering to industrial production. The aqueous mixture for spray drying is formed by quenching the molten V2O5. The products received after spray drying is vanadium oxide hydrate of amorphous structure. The zinc ion storage performance is investigated in terms of content of graphene oxide in the composite. The fabricated amorphous V2O5-EGO composite xerogel with 2D heterostructure possesses high zinc ion storage capability, high rate performance and stable cycling stability due to the functionality of graphene embedded in the composite material. In the third part, inspired by the common intercalation electrochemistry of graphite and transition metal dichalcogenide, exfoliation for 2D MoS2 from its bulk crystal powder is investigated by using the packed bed set up. Organic solvent is found to be a critical factor in the electrochemical activation and the mechanical exfoliation process. The MoS2 bulk crystal can be exfoliated to few-layer nanosheets with stable solution dispersibility. This finding further broadens the horizon of electrochemical production of transition metal dichalcogenides through a scalable approach of electrochemical reaction in packed bed. To sum up, this PhD thesis represents a huge step forward for EGO applications in sodium ion battery anode and aqueous zinc ion battery cathode. In addition, it develops a scalable production of vanadium oxide/graphene material by the spray dry method. The utility of the packed bed electrochemical reactor is extended to transition metal dichalcogenide MoS2. This work will be a valuable guidance for adoption of graphene, vanadium oxide, and MoS2 in the market of energy storage materials.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Environment and Science
Science, Environment, Engineering and Technology
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Hsueh, Jen-Hao, and 薛任皓. "Electrochemical Exfoliation of Graphene Sheets from Natural Graphite Flask." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/60896231630466234055.

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碩士
元智大學
化學工程與材料科學學系
104
An electrochemical route to functionalize graphene nanosheets (GNs) directly from a natural graphite electrode is described herein in the presence of sulfate ions under constant-voltage (CV) and constant-current (CC) models at temperature range of 303‒333 K. This electrochemical exfoliation process is more effective than chemical exfoliation processes and also provides a means of producing low-defect and high-yield GN products. The influence of exfoliation temperature on the quality of as-prepared GN products is systematically investigated. To clarify this effect, one mechanism, consisted of (i) ionic intercalation, (ii) anion insertion and polarization, (iii) water electrolysis and SO2 evolution, and (iv) bubble expansion, is proposed. The interlayer distance, defect concentration, and growth rate of GNs as an increasing function of exfoliation temperature can be obtained. By using only 250 ml reactor, more than 1.8 g of GNs is obtained in less than 1 h through the CC operation. The growth rate of GNs under CC model is approximately five times higher than that under CV one at the fixed temperature. Based on the analysis of Arrhenius plots, the apparent activation energies through the CV and CC models are 20.6 and 23.1 kJ/mol, respectively. As a result, this exfoliation method using the CC model displays a potentially scalable approach for generating high-quality GN products.
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Mir, Afkham. "Synthesis of bilayer and trilayer graphene suspensions by electrochemical exfoliation of graphite." Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7952.

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Chih, Yun-Jhong, and 池允中. "Graphene oxide material producted by highly oriented pyrolytic graphite with electrochemical exfoliation applied on field emission device." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/p5ku77.

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碩士
國立中山大學
電機工程學系研究所
103
When grahene proofed can exist independently in 2004, the research and product about it develop in prosperity. Graphene oxide have a lot of unique physical properties, such as high electron mobility, high thermal conductivity, high transmittance and robust strong tenacity, etc. It is very competitively in new nano-material field through these special physic and material properties. Graphene oxide is used in nanoelectronics, sensors, electrochemical system and energy storage device, etc. This thesis is divided into two parts. First, producting grapheme oxide in different experimental factors and its material analysis. Second, taking it as cathode to conduct electron field emission experiment. In experiment, highly oriented pyrolytic graphite is taken to produce graphene oxide with electrochemical exfoliation and adjusting electrolysis solution’s concentration, insert voltage to chase quality optimization. All of the finished outcome is analyzed with Raman spectroscopy, XRD and XPS. Raman spectroscopy can detect the defect and structure without damage. XRD, XPS are examining lattice structure and chemical bondings, respectively. All of them are making quality confirmation. Before conducting field emission experiment, all samples are observed with SEM. The samples made with higher insert voltage have more obvious nano-structure. Moreover, the samples manufactured with potassium hydroxide have most obvious wrinkle structure, highest aspect ratio. At last, the sample prepared with higher insert voltage, lower sulphuric acid ratiio and more potassium hydroxide solution has the best field emission efficacy. The turn-on field and field emission enhance factor are 2.03 V⁄μm and 8377 separately. The light flux and illumination of this field emission device are 4.21lumens , 140.3 luxes.
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Book chapters on the topic "Graphite-Electrochemical exfoliation"

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"Electrochemical Exfoliation: A Cost-Effective Approach to Produce Graphene Nanoplatelets in Bulk Quantities." In Graphite, Graphene, and Their Polymer Nanocomposites, 162–91. CRC Press, 2012. http://dx.doi.org/10.1201/b13051-8.

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Conference papers on the topic "Graphite-Electrochemical exfoliation"

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He, D. X., W. D. Xue, and R. Zhao. "Aqueous Solution of Ammonium Persulfate Assisted Electrochemical Exfoliation of Graphite into Graphene." In The International Workshop on Materials, Chemistry and Engineering. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0007443006580662.

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Handaya, Devi, Isnanda Nuriskasari, Agus Edy Pramono, Mochammad Tendi Noer Ramadhan, and Samuel Aryatama Hutabarat. "The effect of solenoid for synthesis graphene using electrochemical exfoliation method with graphite composite electrode." In THE 2ND INTERNATIONAL CONFERENCE ON NATURAL SCIENCES, MATHEMATICS, APPLICATIONS, RESEARCH, AND TECHNOLOGY (ICON-SMART 2021): Materials Science and Bioinformatics for Medical, Food, and Marine Industries. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0118409.

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Vasilieva, F. D., A. N. Kapitonov, and E. A. Yakimchuk. "Analysis of properties of oxidized graphene dispersions for 2D printing obtained by electrochemical exfoliation of graphite." In 6TH INTERNATIONAL CONFERENCE ON PRODUCTION, ENERGY AND RELIABILITY 2018: World Engineering Science & Technology Congress (ESTCON). Author(s), 2018. http://dx.doi.org/10.1063/1.5079337.

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Iskandar, Ferry, Oktaviardi Bityasmawan Abdillah, Tirta Rona Mayangsari, and Akfiny Hasdi Aimon. "Preliminary Study of Graphite Rod Pre-treatment in H2O2/H2SO4 Mixture Solution on the Synthesized Graphene by Electrochemical Exfoliation Method." In 2018 5th International Conference on Electric Vehicular Technology (ICEVT). IEEE, 2018. http://dx.doi.org/10.1109/icevt.2018.8628382.

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