High‐Quality Graphene Using Boudouard Reaction

Grebenko, Artem K.; Krasnikov, Dmitry V.; Bubis, Anton V.; Stolyarov, V. S.; Vyalikh, D. V.; Макарова, Анна A.; Fedorov, Alexander; Aitkulova, A.; Alekseeva, Alena; Gilshtein, Evgeniia; Bedran, Z. V.; Shmakov, Alexander N.; Alyabyeva, Liudmila; Mozhchil, Rais N.; Ионов, А.М.; Gorshunov, B. P.; Laasonen, Kari; Podzorov, Vitaly; Nasibulin, Albert G.

doi:10.1002/advs.202200217

Cited by 16 publications

(12 citation statements)

References 72 publications

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“…The longer activation of GFA in CO 2 (70 min) resulted in a relatively higher amount of impurities. This can be related to the Boudouard reaction occurring on the GFA surface during the activation and leading to a decrease in C content [ 39 , 40 ]. Moreover, the presence of O, Na, and K was observed only in the case of GFA-70 ( Figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

Electrochemical and Catalytic Properties of Carbon Dioxide-Activated Graphite Felt

et al. 2022

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The commercial graphite felt GFA 10 was subjected to an activation process with the use of CO2 at 900 °C for 35 and 70 min. Pristine and heat-treated materials were characterized using various methods: low-temperature N2 adsorption, SEM, and EDS. Voltammetric measurements of GFA samples (before and after activation) as the working electrode were carried out. Voltammograms were recorded in aqueous solutions of 4-chlorophenol and sodium sulfate as supporting electrolyte. The catalytic activity of GFA samples in the process of 4-chlorophenol oxidation with the use of H2O2 was also investigated. The influence of graphite felt thermal activation in the CO2 atmosphere on its electrochemical and catalytic behavior was analyzed and discussed. Results of the investigation indicate that GFA activated in CO2 can be applied as an electrode material or catalytic material in the removal of organic compounds from industrial wastewater. However, the corrosion resistance of GFA, which is decreasing during the activation, needs to be refined.

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Section: Resultsmentioning

confidence: 99%

Electrochemical and Catalytic Properties of Carbon Dioxide-Activated Graphite Felt

et al. 2022

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“…It is easy to oxidize the defects at the carbon edge and form graphene carbon with high order. [ 18 ] These carbon nanoribbons consist of 10–30 sublayers with thicknesses between 4 and 25 nm and lengths up to 50–200 nm (Figure 2d–f). Compared with amorphous free carbon, crystalline carbon nanoribbons can provide more excellent electrical conductivity, and fewer defects also avoid the ICE disadvantage caused by amorphous carbon materials.…”

Section: Resultsmentioning

confidence: 99%

SiOC Phase Control and Carbon Nanoribbon Growth by Introducing Oxygen at Atom Level for Lithium‐Ion Batteries

Zheng

Shi

et al. 2022

Small Methods

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Poor intrinsic conductivity and the presence of irreversible lithiation phase affect the electrochemical performance of silicon oxycarbide anode materials. Even though it can be improved by increasing free carbon content or composition, scarification of reversible capacity and initial Coulombic efficiency (ICE) remain as challenge. Here, polycarbosilane (PCS) with alternating distribution of silicon and carbon atoms is employed as precursor of SiOC ceramics. Air oxidation cross‐linking is used to regulate the content of oxygen and carbon elements in PCS at atom level, so as to explore a solution to improve the intrinsic conductivity and reversible lithium phase content of SiOC ceramics. This strategy provides extremely excellent rate capability, areal/volumetric capacity, and ICE. This is also the first concept for feasible precursor structure design to control the SiOC glass phase and regulate the growth of C nanoribbon that can improve the intrinsic conductivity and reversible capacity of SiOC ceramic anode materials.

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“…While in some papers [ 30 , 43 ] the desorption of a carbon monomer is taken into consideration, we evaluate its binding energy as 4.98 eV (PBE-D3) and its lifetime by orders of magnitude higher than the considered timeline. Thus, the process of re-evaporation is considered as insignificant.…”

Section: Theory and Computational Detailsmentioning

confidence: 99%

Analytical Model of CVD Growth of Graphene on Cu(111) Surface

et al. 2022

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Although the CVD synthesis of graphene on Cu(111) is an industrial process of outstanding importance, its theoretical description and modeling are hampered by its multiscale nature and the large number of elementary reactions involved. In this work, we propose an analytical model of graphene nucleation and growth on Cu(111) surfaces based on the combination of kinetic nucleation theory and the DFT simulations of elementary steps. In the framework of the proposed model, the mechanism of graphene nucleation is analyzed with particular emphasis on the roles played by the two main feeding species, C and C2. Our analysis reveals unexpected patterns of graphene growth, not typical for classical nucleation theories. In addition, we show that the proposed theory allows for the reproduction of the experimentally observed characteristics of polycrystalline graphene samples in the most computationally efficient way.

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High‐Quality Graphene Using Boudouard Reaction

Cited by 16 publications

References 72 publications

Electrochemical and Catalytic Properties of Carbon Dioxide-Activated Graphite Felt

Electrochemical and Catalytic Properties of Carbon Dioxide-Activated Graphite Felt

SiOC Phase Control and Carbon Nanoribbon Growth by Introducing Oxygen at Atom Level for Lithium‐Ion Batteries

Analytical Model of CVD Growth of Graphene on Cu(111) Surface

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