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Heteroatom-Doped Flash Graphene.

Weiyin Chen, Chang Ge, John Tianci Li

    ACS Nano
    |March 23, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Flash Joule heating enables catalyst-free, solvent-free synthesis of various heteroatom-doped graphene materials in bulk. This scalable method offers a low-cost route to high-quality doped graphene for applications in catalysis and energy storage.

    Keywords:
    catalyst-freedirect synthesisflash Joule heatingflash grapheneheteroatom-doping

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Chemistry

    Background:

    • Heteroatom doping modifies the properties of 2D materials like graphene.
    • Current methods for doped graphene synthesis often require harsh reagents and are challenging for large-scale production.
    • Direct bottom-up synthesis of high-purity, doped graphene remains a significant challenge.

    Purpose of the Study:

    • To develop a novel, scalable, and environmentally friendly method for synthesizing various heteroatom-doped graphene materials.
    • To investigate the synthesis of single, dual, and triple heteroatom-doped graphene using flash Joule heating.
    • To evaluate the performance of the synthesized doped graphene in electrochemical and energy storage applications.

    Main Methods:

    • Catalyst-free and solvent-free synthesis of heteroatom-doped graphene via flash Joule heating (FJH).
    • Utilized various low-cost dopants including elements, oxides, and organic compounds.
    • Synthesized seven types of doped graphene: single-element (B, N, O, P, S), two-element (B, N), and three-element (B, N, S) co-doped flash graphene (FG).

    Main Results:

    • Achieved bulk synthesis of high-quality heteroatom-doped FG with turbostratic structure, increased interlayer spacing, and superior dispersibility.
    • Sulfur-doped FG demonstrated superior performance in electrochemical oxygen reduction reactions.
    • Nitrogen-doped FG showed a smaller nucleation overpotential in lithium metal battery tests compared to undoped graphene.
    • Synthesis energy cost ranged from 1.2 to 10.7 kJ g⁻¹.

    Conclusions:

    • Flash Joule heating is a viable, low-cost, and scalable method for producing diverse heteroatom-doped graphene.
    • The synthesized doped graphene materials exhibit promising properties for electrochemical and energy storage applications.
    • This FJH approach offers a sustainable alternative for mass production of advanced graphene materials.