Facile synthesis of graphene from graphite using ascorbic acid as reducing agent

Andrijanto, Eko; Shoelarta, Shoerya; Subiyanto, Gatot; Rifki, Sadur

doi:10.1063/1.4945457

Cited by 145 publications

(59 citation statements)

References 13 publications

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“…Peaks at 1722 cm −1 and 1220 cm −1 are absent in rGO which support the removal of oxygen groups from sheets of GO on reduction. Furthermore, the peak at 1650 cm −1 compliments the recovery of sp 2 lattice in graphene [38].…”

Section: Resultsmentioning

confidence: 70%

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

et al. 2020

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In this work a novel bimetallic nickel oxide/copper oxide metal–organic framework (NiO/CuO MOF) has been developed by using two linkers: Benzene Dicarboxylic acid (BDC) and Pyrazine. The composites of NiO/CuO MOF with different amounts of reduced graphene oxide (rGO) were synthesized through a hydrothermal method and subsequently characterized by multiple significant techniques like XRD, SEM, EDX, FTIR and Raman IR for an investigation of their structural and morphological properties. The prepared series of material was later employed for electrochemical oxidation of methanol, tested by cyclic voltammetry (CV) in basic medium on a modified glassy carbon electrode (GCE). The electrochemical response depicts that increasing concentration of rGO enhances the electrocatalytic activity of the catalyst for methanol oxidation reaction (MOR). The catalyzed oxidation reaction of methanol by NiO/CuO MOF and rGO-NiO/CuO MOF composites give a superlative current density of 437. 28 mA/cm2 at 0.9 V potential at 50 mV/s scan rate. This activity makes it a promising catalytic material for electrolysis of methanol in direct methanol fuel cell (DMFC).

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Section: Resultsmentioning

confidence: 70%

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

et al. 2020

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“…Figure 2 shows the FTIR spectra of catalyst materials before (A) and after (B) Au NPs deposition. The IR spectra (Figure 2A) exhibits vibrations typical of GO (Figure 2A) with a broad band extending from 2500 cm −1 to 3600 cm −1 (C−OH or O−H stretching), a peak at 1703 cm −1 (C=O stretching of −COOH groups), 1548 cm −1 (C=C stretching of aromatic sp 2 carbons), 1410 cm −1 (C−OH deformation), 1340 cm −1 (C−O‐C epoxy stretching) (C−O carboxy stretching) and 1143 cm −1 (C−O carboxy stretching) (C−O epoxy stretching) [34] . A decrease in band intensity was observed in carbonyl/epoxy carboxyl functional groups (−C=O,−C−O−C−) at 1703 cm −1 and 1143 cm −1 respectively, when nGO was reduced to r‐nGO or r‐nGO‐CA.…”

Section: Resultsmentioning

confidence: 99%

Cellulose‐Based Reduced Nanographene Oxide on Gold Nanoparticle Supports for CO₂ Electrocatalysis

et al. 2020

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Cellulose‐based reduced graphene oxide materials (r‐nGO) were fabricated and anchored onto polyvinyl alcohol stabilized gold nanoparticles. Their potential in applications in the electrocatalytic reduction of CO2 (ER‐CO2) is demonstrated. The nGO was synthesized by microwave‐assisted cellulose carbonization followed by two different reduction methods, that is, with super‐heated water (i) or caffeic acid (ii). These materials, denoted as r‐nGO (i) r‐nGO‐CA (ii), were utilized to immobilize colloidal gold nanoparticles (Au NPs) in an aqueous environment. The two r‐nGO‐supported Au NP materials were deposited on glassy carbon electrode surfaces and studied as catalysts for ER‐CO2. ER‐CO2 was investigated at room temperature and pressure (RTP) using ionic liquids (RTILs) or an aprotic solvent acetonitrile (ACN). Tetrabutylammonium hexafluoroborate (TBAPF6) was used as an electrolyte salt in the case of ACN. The current response resulting from ER‐CO2 was measured under cyclic voltammetric conditions using a one‐compartment three‐electrode cell. Results showed that, r‐nGO‐supported gold nanoparticles catalyze ER‐CO2 and they significantly reduce the overpotential of CO2 reduction from −1.9 V to −1.6 V vs. Ag/AgCl. Moreover, of all the materials studied, Au/r‐nGO was superior in reducing CO2 in both RTILs and TBAPF6/ACN. These outcomes serve as grounds for the further development of electrocatalysts from bio‐based reduced graphene oxides.

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“…28 Most of the associated oxygen-containing peaks were removed or greatly decreased after the reduction process, verifying the successful reduction of the samples despite some weak residual O-H peaks can be observed at approximately 1048 and 1173 cm À1 . 29 Some new peaks also appeared at approximately 2923 and 2852 cm À1 , attributed to the CH 2 stretching vibration and CH stretching vibrations, respectively. 30 The appearance of these new peaks can be ascribed to the reduction of the carbocylic acids in GO to CH 2 OH.…”

Section: Characterizationmentioning

confidence: 97%

Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction

Tan

Ong

et al. 2019

Nanomaterials and Nanotechnology

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In spite of advantages of direct methanol fuel cells, low methanol oxidation reaction and fuel crossover from anode to cathode, there remains a challenge that inhibits it from being commercialized. Active electrocatalysts are in high demand to promote the methanol oxidation reaction. The methanol reached at the anode can be immediately reacted, and thus, less methanol to cross to the cathode. The performance of electrocatalysts can be significantly influenced by varying the concentration of precursor solution. Theoretically, concentrated precursor solution facilitates rapid nucleation and growth; diluted precursor solution causes slow nucleation and growth. Rapid nucleation and slow growth have positive effect on the size of electrocatalysts which plays a significant role in the catalytic performance. Upon the addition of appropriate concentration of graphene oxide, the graphene oxide was reported to have stabilizing effect towards the catalyst nanoparticles. This work synthesized reduced graphene oxide-supported palladium electrocatalysts at different concentrations (0.5, 1.0, 2.0, 3.0 and 4.0 mg mL À1) with fixed volume and mass ratio of reduced graphene oxide to palladium by microwave-assisted reduction method. Results showed that reduced graphene oxide-supported palladium synthesized at a concentration of 1.0 mg mL À1 gave the best methanol oxidation reactivity (405.37 mA mg À1) and largest electrochemical active surface area (83.57 m 2 g À1).

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Facile synthesis of graphene from graphite using ascorbic acid as reducing agent

Cited by 145 publications

References 13 publications

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

Cellulose‐Based Reduced Nanographene Oxide on Gold Nanoparticle Supports for CO₂ Electrocatalysis

Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction

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Facile synthesis of graphene from graphite using ascorbic acid as reducing agent

Cited by 145 publications

References 13 publications

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

Nanocomposites of NiO/CuO Based MOF with rGO: An Efficient and Robust Electrocatalyst for Methanol Oxidation Reaction in DMFC

Cellulose‐Based Reduced Nanographene Oxide on Gold Nanoparticle Supports for CO2 Electrocatalysis

Nucleation and growth controlled reduced graphene oxide–supported palladium electrocatalysts for methanol oxidation reaction

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Cellulose‐Based Reduced Nanographene Oxide on Gold Nanoparticle Supports for CO₂ Electrocatalysis