Synthesis of γ-graphyne by mechanochemistry and its electronic structure

Li, Qiaodan; Li, Yong; Yang, Chen; Wu, Lulu; Yang, Chaofan; Cui, Xiaoli

doi:10.1016/j.carbon.2018.04.081

Cited by 230 publications

(139 citation statements)

References 43 publications

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“…More recently, we have first synthesized γ‐graphyne and hydrogen‐substituted graphyne by a mechanochemical route and applied it into photocatalytic hydrogen evolution . In fact, the synthesis mechanism was not verified in our preliminary studies.…”

Section: Introductionmentioning

confidence: 87%

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Yang

et al. 2019

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γ‐Graphyne is a new nanostructured carbon material with large theoretical Li+ storage due to its unique large conjugate rings, which makes it a potential anode for high‐capacity lithium‐ion batteries (LIBs). In this work, γ‐graphyne‐based high‐capacity LIBs are demonstrated experimentally. γ‐Graphyne is synthesized through mechanochemical and calcination processes by using CaC2 and C6Br6. Brunauer–Emmett–Teller, atomic force microscopy, X‐ray photoelectron spectroscopy, solid‐state 13C NMR and Raman spectra are conducted to confirm its morphology and chemical structure. The sample presents 2D mesoporous structure and is exactly composed of sp and sp2‐hybridized carbon atoms as the γ‐graphyne structure. The electrode shows high Li+ storage (1104.5 mAh g−1 at 100 mA g−1) and rate capability (435.1 mAh g−1 at 5 A g−1). The capacity retention can be up to 948.6 (200 mA g−1 for 350 cycles) and 730.4 mAh g−1 (1 A g−1 for 600 cycles), respectively. These excellent electrochemical performances are ascribed to the mesoporous architecture, large conjugate rings, enlarged interplanar distance, and high structural integrity for fast Li+ diffusion and improved cycling stability in γ‐graphyne. This work provides an environmentally benign and cost‐effective mechanochemical method to synthesize γ‐graphyne and demonstrates its superior Li+ storage experimentally.

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Section: Introductionmentioning

confidence: 87%

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Yang

et al. 2019

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“…Recently, the mechanochemical approach has been used to synthesize catalysts, magnets, γ‐graphyne, metal iodates, CuFeS 2 particles, nickel–vanadium carbide, and molybdenum–vanadium carbide nanocomposite powders …”

Section: Introductionmentioning

confidence: 82%

“…Recently,t he mechanochemicala pproachh as been used to synthesize catalysts, [35,36] magnets, [21,37,38] g-graphyne, [39] metal iodates, [40] CuFeS 2 particles, [41] nickel-vanadium carbide, [42] and molybdenum-vanadium carbiden anocomposite powders. [43] We report the synthesiso fF ea nd Co nanoparticles as well as their nanocomposites with CaO by mechanochemical processing.W eu sed commonly occurring, inexpensive metal oxidesa ss tarting materials rathert han the usual metal salts or metal acetylacetonate/carbonyl complexes.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

et al. 2018

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We report an environmentally benign and cost‐effective method to produce Fe and Co magnetic metal nanoparticles as well as the Fe/Cao and Co/CaO nanocomposites by using a novel, dry mechanochemical process. Mechanochemical milling of metal oxides with a suitable reducing agent resulted in the production of magnetic metal nanoparticles. The process involved grinding and consequent reduction of low‐costing oxide powders, unlike conventional processing techniques involving metal salts or metal complexes. Calcium granules were used as the reducing agent. Magnetometry measurements were performed over a large range of temperatures, from 10 to 1273 K, to evaluate the Curie temperature, blocking temperature, irreversibility temperature, saturation magnetization, and coercivity. The saturation magnetizations of the iron and cobalt nanoparticles were found to be 191 and 102 emu g−1, respectively. The heating abilities of these nanoparticles suspended in several liquids under alternating magnetic fields were measured and the specific loss power was determined. Our results suggest that the dry mechanochemical process is a robust method to produce metallic nanoparticles and nanocomposites.

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“…Recently, the 2D carbon allotropes γ‐graphyne, γ‐graphdiyne, and β‐graphdiyne, all of which contain acetylenic linkages, have been synthesized by different methods. Inspired by these developments, here we take the acetylenic linkages and the carbon skeletons of para ‐xylene as building blocks to design the needed 2D Dirac material.…”

Section: The Lattice Constants (A and B) And 2d Eos Fitting Parametermentioning

confidence: 99%

“…Particularly, the largest Fermi velocity is 8.89 × 10 5 m s −1 , very close to that of the prominent graphene. In view of the recent successes in synthesizing 2D carbon allotropes built by acetylenic linkages, it is reasonable to believe that the proposed palgraphyne would be an attractive synthesis target and its intriguing features should be promising in next‐generation carbon‐based nanoelectronic applications.…”

Section: The Lattice Constants (A and B) And 2d Eos Fitting Parametermentioning

confidence: 99%

Palgraphyne: A Promising 2D Carbon Dirac Semimetal with Strong Mechanical and Electronic Anisotropy

Zhao

Cui

Cai

et al. 2020

Physica Rapid Research Ltrs

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For next‐generation carbon‐based nanoelectronics, it is highly desirable to search for easily obtained 2D carbon allotropes with various appealing properties. Herein, based on first‐principles calculations, a new 2D carbon Dirac semimetal with orthorhombic symmetry is identified, which is composed of a carbon skeleton of para‐xylene and acetylenic linkages, and is thus termed palgraphyne [pæl'græfain]. The calculations of stability reveal not only that palgraphyne is dynamically, thermally (above 1000 K), and mechanically stable, but also that it is energetically more preferable to the recently synthesized β‐graphdiyne and γ‐graphdiyne. Due to the particular atomic‐framework, the calculations of Young's modulus and Poisson's ratio show that palgraphyne is mechanically anisotropic with a sizable ratio between the maximum and minimum value up to 3.29. Remarkably, unlike the case of graphene, the Dirac cones of palgraphyne are distorted. As a result, its electronic transport properties also exhibit anisotropy, with different Fermi velocities along diverse orientations. The highest Fermi velocity reaches up to 8.89 × 105 m s−1 in the kx + ky direction, which is very close to that of prominent graphene (9.0 × 105 m s−1). The findings highlight a distinct 2D anisotropic Dirac semimetal, which has great potential applications in nanodevices.

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Synthesis of γ-graphyne by mechanochemistry and its electronic structure

Cited by 230 publications

References 43 publications

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Mechanochemical Synthesis of γ‐Graphyne with Enhanced Lithium Storage Performance

Mechanochemical Synthesis of Iron and Cobalt Magnetic Metal Nanoparticles and Iron/Calcium Oxide and Cobalt/Calcium Oxide Nanocomposites

Palgraphyne: A Promising 2D Carbon Dirac Semimetal with Strong Mechanical and Electronic Anisotropy

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