Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Vermisoglou, Eleni C.; Giannakopoulou, T.; Romanos, George E.; Giannouri, M.; Boukos, N.; Lei, Chunhong; Lekakou, Constantina; Trapalis, C.

doi:10.1016/j.apsusc.2015.08.127

Cited by 48 publications

(31 citation statements)

References 63 publications

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“…After this reaction, the unreacted amino functional groups on CDs were free to react with other GO sheets, causing precipitation in the aqueous solution (Figure 2b). Subsequently, the CDs/GO composite was reduced via a reduction reaction in hydrogen dielectric barrier discharge (DBD) plasma to produce the CDs/rGO composite, written CDs/rGO (5:1), in order to improve graphene’s electrical conductivity [31,32,33]. FTIR spectroscopy was used to characterize the reaction and reduction processes, as shown in Figure 2c.…”

Section: Resultsmentioning

confidence: 99%

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

et al. 2016

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There is much recent interest in graphene-based composite electrode materials because of their excellent mechanical strengths, high electron mobilities, and large specific surface areas. These materials are good candidates for applications in supercapacitors. In this work, a new graphene-based electrode material for supercapacitors was fabricated by anchoring carbon dots (CDs) on reduced graphene oxide (rGO). The capacitive properties of electrodes in aqueous electrolytes were systematically studied by galvanostatic charge-discharge measurements, cyclic voltammetry, and electrochemical impedance spectroscopy. The capacitance of rGO was improved when an appropriate amount of CDs were added to the material. The CD/rGO electrode exhibited a good reversibility, excellent rate capability, fast charge transfer, and high specific capacitance in 1 M H2SO4. Its capacitance was as high as 211.9 F/g at a current density of 0.5 A/g. This capacitance was 74.3% higher than that of a pristine rGO electrode (121.6 F/g), and the capacitance of the CD/rGO electrode retained 92.8% of its original value after 1000 cycles at a CDs-to-rGO ratio of 5:1.

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Section: Resultsmentioning

confidence: 99%

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

et al. 2016

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“…Lately, reduction of graphene oxide has been achieved by solvo/hydrothermal treatment [29,30], spray pyrolysis [31], supercritical ethanol processing [32], electrochemical reduction [33], nature-based reducing agents like vitamins, plant extracts etc. [34].…”

Section: Introductionmentioning

confidence: 99%

Self-propagating solar light reduction of graphite oxide in water

Todorova

Giannakopoulou

Boukos

et al. 2017

Applied Surface Science

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“…20 Fortunately, many researchers have reported that the preparation of graphene can be achieved using an eco-friendly hydrothermal reaction with graphene oxide 21,22 or graphite with inorganic salts as an intercalant. Park et al 16 prepared high-quality graphene akes using molten ternary KCl-NaCl-ZnCl 2 salt as an intercalator at a high temperature of $350 C. Niu et al 23 reported the direct exfoliation of graphite into high-quality, largesize and few-layer graphene sheets using aqueous mixtures of graphite and inorganic salts such as NaCl and CuCl 2 .…”

Section: -15mentioning

confidence: 99%

Towards understanding the salt-intercalation exfoliation of graphite into graphene

Wang

Xiang

2017

RSC Adv.

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The preparation of graphene from graphite is critical for both theoretical studies and real-world applications. Herein, we present a systematic study to explore the fundamental factors that control the exfoliation of graphite into graphene in a salt-intercalation exfoliation system, using various inorganic salts as intercalators. The yields of the thin graphene sheets obtained, measured via UV-vis absorption spectrophotometry, suggest that both cations and anions significantly influence the exfoliation yields. Xray photoelectron spectroscopy and energy dispersive spectroscopy analysis showed that both anions and cations become inserted into the space between conjugated graphite layers during the intercalation process. X-ray diffraction spectra revealed that the anion can enhance the salt-intercalation exfoliation by expanding the interlayer spacing. Compared to lithium chloride, both potassium chloride and lithium sulfate can significantly enhance the exfoliation yields of graphene. Optimizing the cation and anion species can improve the yield of graphene, because co-intercalation with both anions and cations occurs during the intercalation process in the solution of inorganic salts. Our work provides a guide for rationally designing the salt-intercalation exfoliation procedure to obtain higher yields of exfoliated 2D materials.

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Effect of hydrothermal reaction time and alkaline conditions on the electrochemical properties of reduced graphene oxide

Cited by 48 publications

References 63 publications

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

Electrochemical and Capacitive Properties of Carbon Dots/Reduced Graphene Oxide Supercapacitors

Self-propagating solar light reduction of graphite oxide in water

Towards understanding the salt-intercalation exfoliation of graphite into graphene

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