Facile synthesis of graphene nanosheets from humic acid for supercapacitors

Xing, Baolin; Yuan, Ruifu; Zhang, Chuanxiang; Huang, Guangxu; Guo, Hui; Chen, Zhengfei; Chen, Lunjian; Yi, Guiyun; Zhang, Yude; Yu, Jianglong

doi:10.1016/j.fuproc.2017.05.021

Cited by 94 publications

(23 citation statements)

References 48 publications

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“…Moreover, the r-GO H shows a low equivalent series resistance of 0.15 Ω (inset in Figure 5 c). Meanwhile, the equivalent series resistance of r-GO H is lower than those of reduced graphene oxide nanosheets prepared from humic acid by preliminary carbonization coupled with oxidation-exfoliation-thermal reduction (0.17 Ω) [ 36 ], 3D nitrogen-doped activated graphene-like nanosheets (0.38 Ω) [ 37 ] and edge-nitrogenized graphene nanoplatelets (up to 0.35 Ω) [ 38 ]. The satisfactory electrochemical performances of r-GO H are ascribed to its developed mesoporous structure and good electrical conductivity.…”

Section: Resultsmentioning

confidence: 99%

One-Step Green Hydrothermal Synthesis of Few-Layer Graphene Oxide from Humic Acid

et al. 2018

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The conventional synthesis route of graphene oxide (GOG), based on Hummers method, suffers from explosion risk, environmental concerns and a tedious synthesis process, which increases production costs and hinders its practical applications. Herein, we report a novel strategy for preparing few-layer graphene oxide (GOH) from humic acid via simple hydrothermal treatment. The formation of GOH is mainly attributed to the hydrolysis, oxidation and aromatization of humic acid under hydrothermal conditions. The as-prepared few-layer GOH has typical morphology (thin and crumpled sheets with the thickness of ~3.2 nm), crystal structure (a Raman ID/IG ratio of 1.09) and chemical composition (an X-ray Photoelectron Spectroscopy (XPS) O/C atomic ratio of 0.36) of few-layer GOG. The thermally reduced GOH (r-GOH) delivers considerable area capacitance of 28 µF·cm−2, high rate capability and low electrochemical resistance as supercapacitor electrodes. The described hydrothermal process shows great promise for the cheap, green and efficient synthesis of few-layer graphene oxide for advanced applications.

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Section: Resultsmentioning

confidence: 99%

One-Step Green Hydrothermal Synthesis of Few-Layer Graphene Oxide from Humic Acid

et al. 2018

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“…Therefore, great efforts have been devoted to improving the capacitive performance of ACs by functionalization via heteroatom doping, such as nitrogen, sulphur and oxygen. [8][9][10][11][12][13][14][15][16][17][18] Heteroatom-containing functional groups have been considered to be capable of inducing pseudocapacitance, enhanced wettability of pore walls and increased conductivity in ACs. Thus, several strategies have been proposed to introduce heteroatoms into ACs, including in situ doping and postprocessing procedures.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen self-doped activated carbonsviathe direct activation ofSamanea samanleaves for high energy density supercapacitors

et al. 2019

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“…Major structural changes during pre-oxidation for anthracite mainly occurred around 1,000 and 1,300 cm −1 region. The intensity of 1,150-1,250 cm −1 assigned to saturated aliphatic skeletal C-C vibration was found to be weaker and there was a group of peaks in the region 1,150-950 cm −1 due to stretching vibration of C-O (C-O-C or phenolic) for oxidized coal (Okolo et al, 2015;Xing et al, 2017;Qiu et al, 2020), suggesting that a large number of oxygen-containing functional groups were formed and a part of aliphatic carbon atoms were consumed during the pre-oxidation process.…”

Section: Characterization Of Oxidized Coal and Preparation Principle mentioning

confidence: 97%

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

et al. 2020

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Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K 2 FeO 4 pre-oxidation and H 2 O 2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K 2 FeO 4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H 2 O 2 oxidation by simply adjusting the concentration of H 2 O 2 . All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence.

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Facile synthesis of graphene nanosheets from humic acid for supercapacitors

Cited by 94 publications

References 48 publications

One-Step Green Hydrothermal Synthesis of Few-Layer Graphene Oxide from Humic Acid

One-Step Green Hydrothermal Synthesis of Few-Layer Graphene Oxide from Humic Acid

Nitrogen self-doped activated carbonsviathe direct activation ofSamanea samanleaves for high energy density supercapacitors

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

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