Differences in the structure and functionalities of graphene oxide and reduced graphene oxide obtained from graphite with various degrees of graphitization

Bychko, Igor; Abakumov, Alexander; Didenko, O. Z.; Chen, Mengyao; Tang, Jianguo; Strizhak, P. E.

doi:10.1016/j.jpcs.2022.110614

Cited by 39 publications

(29 citation statements)

References 81 publications

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“…The deconvoluted I3d 5/2 peak shows two peaks: first is the 617.96 eV peak of triodide (I 3 − ), and the second is 620.21 eV corresponding to pentaiodide (I 5 − ). These results are the same with the one reported in literature [ 7 ]. The first peak is attributed to the iodine anions from an excess of HI and the second peak is assigned to the introduction of iodine into the GO substrate reduced by HI.…”

Section: Resultssupporting

confidence: 93%

“…Typically, thermal reduction occurs in an inert atmosphere at high temperatures 300–2000 °C. The photochemical reduction of GO involves a direct laser beam at wavelengths below 390 nm [ 7 ]. The promising properties of GO and rGO derivatives, such as the high specific surface area, the electrical conductivity of rGO, and the chemical activity of GO, are mainly useful for energy storage applications.…”

Section: Introductionmentioning

confidence: 99%

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Iodine-Doped Graphene Oxide: Fast Single-Stage Synthesis and Application as Electrocatalyst

et al. 2022

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Iodine-doped graphene oxide is attracting great attention as fuel cell (FC) electrocatalysts with a high activity for the oxygen reduction reaction (ORR). However, most of the reported preparation techniques for iodine-doped graphene (I/rGO) could be transposed into practice as multiple step procedures, a significant disadvantage for scale-up applications. Herein, we describe an effective, eco-friendly, and fast technique for synthesis by a microwave-tuned one-stage technique. Structural and morphological characterizations evidenced the obtaining of nanocomposite sheets, with iodine bonded in the graphene matrix. The ORR performance of I/rGO was electrochemically investigated and the enhancement of the cathodic peak was noted. Based on the noteworthy electrochemical properties for ORR activity, the prepared I/rGO can be considered an encouraging alternative for a more economical electrode for fuel cell fabrication and commercialization. In this perspective, the iodine-based catalysts synthesis can be considered a step forward for the metal-free electrocatalysts development for the oxygen reduction reaction in fuel cells.

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Iodine-Doped Graphene Oxide: Fast Single-Stage Synthesis and Application as Electrocatalyst

et al. 2022

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“…Likewise, the absorption band at 1559 cm −1 corresponds to the aromatic C=C, which indicates the presence of a conjugated sp 2 system [ 23 ]. Moreover, a band at 1007 cm −1 corresponds to hydroxyl and ether groups [ 24 ].…”

Section: Resultsmentioning

confidence: 99%

Electrical Properties of Polyetherimide-Based Nanocomposites Filled with Reduced Graphene Oxide and Graphene Oxide-Barium Titanate-Based Hybrid Nanoparticles

2022

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The electrical properties of nanocomposites based on polyetherimide (PEI) filled with reduced graphene oxide (rGO) and a graphene oxide hybrid material obtained from graphene oxide grafted with poly(monomethyl itaconate) (PMMI) modified with barium titanate nanoparticles (BTN) getting (GO-g-PMMI/BTN) were studied. The results indicated that the nanocomposite filled with GO-g-PMMI/BTN had almost the same electrical conductivity as PEI (1 × 10−11 S/cm). However, the nanocomposite containing 10 wt.% rGO and 10 wt.% GO-g-PMMI/BTN as fillers showed an electrical conductivity in the order of 1 × 10−7 S/cm. This electrical conductivity is higher than that obtained for nanocomposites filled with 10% rGO (1 × 10−8 S/cm). The combination of rGO and GO-g-PMMI/BTN as filler materials generates a synergistic effect within the polymeric matrix of the nanocomposite favoring the increase in the electrical conductivity of the system.

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“…All of the materials had the almost same morphology. Both GO and rGO had irregular sheet-like structures, and were randomly aggregated together, tightly connected, and overlapping [16]. In the EDX analysis (Table 5) of the materials, the carbonoxygen ratio (C:O) of GO which was 1.25.…”

Section: Resultsmentioning

confidence: 99%

“…In 2010, Tour et al [15] reported an improvement in the Hummers method using ice instead of liquid water to prevent the high-temperature rise thus promoting better and easier control of the process, and increasing the yield and degree of oxidation, and introducing phosphoric acid (H3PO4) to promote the retention of carbon rings in the basal. The difference of Tour method with other methods is based on mixturing H2SO4 and H3PO4 (9:1 v/v) and further oxidation of graphite by KMnO4 [16]. The advantages of Tour method are to produce a more oxidized graphite oxide with a more regular carbon framework and larger sheet size, eliminates the production of toxic gases [17] and produce more heavily oxidized hydrophilic GO [18,19].…”

Section: Introductionmentioning

confidence: 99%

Study of green reductant effects of highly reduced graphene oxide production and their characteristics

Chasanah

Trisunaryanti

Triyono

et al. 2022

CST

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The study of the green reductant effects to produce reduced graphene oxide (rGO) has been completed successfully. The reduction of graphene oxide (GO) was carried out chemically using various reductants such as ascorbic acid (rGO-AA), gallic acid (rGO-AG), and trisodium citrate (rGO-NS). The GO was prepared using the Tour method at a temperature of 65 ? for 6 hours with potassium permanganate: graphite weight ratio 1:3.5. The results showed that rGO-AA had the highest electrical conductivity value of 755.70 S/m, with characteristics such as a surface area of 255.93 m2/g, a pore volume of 0.61 cm3/g, an average pore diameter of 7.10 nm, ID/IG ratio of 1.93, and three graphene layers in the material nanostructure stack. Therefore, it can be concluded that the reduction of GO with ascorbic acid (rGO-AA) is the most effective in producing rGO.

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Differences in the structure and functionalities of graphene oxide and reduced graphene oxide obtained from graphite with various degrees of graphitization

Cited by 39 publications

References 81 publications

Iodine-Doped Graphene Oxide: Fast Single-Stage Synthesis and Application as Electrocatalyst

Iodine-Doped Graphene Oxide: Fast Single-Stage Synthesis and Application as Electrocatalyst

Electrical Properties of Polyetherimide-Based Nanocomposites Filled with Reduced Graphene Oxide and Graphene Oxide-Barium Titanate-Based Hybrid Nanoparticles

Study of green reductant effects of highly reduced graphene oxide production and their characteristics

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