Thermal Exfoliation of Layered Metal-Organic Frameworks into Ultrahydrophilic Graphene Stacks and Their Applications in Li-S Batteries

Guang Ping Hao, Cheng Tang, En Xia Zhang, Peiyan Zhai, Jun Yin, Wancheng Zhu, Qiang Zhang, Stefan Kaskel

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    Abstract

    2D nanocarbon-based materials with controllable pore structures and hydrophilic surface show great potential in electrochemical energy storage systems including lithium sulfur (Li-S) batteries. This paper reports a thermal exfoliation of metal-organic framework crystals with intrinsic 2D structure into multilayer graphene stacks. This family of nanocarbon stacks is composed of well-preserved 2D sheets with highly accessible interlayer macropores, narrowly distributed 7 Å micropores, and ever most polar pore walls. The surface polarity is quantified both by its ultrahigh water vapor uptake of 14.3 mmol g-1 at low relative pressure of P/P 0 = 0.4 and ultrafast water wetting capability in less than 10.0 s. Based on the structural merits, this series hydrophilic multilayer graphene stack is showcased as suitable model cathode host for unveiling the challenging surface chemistry issue in Li-S batteries.

    Original languageEnglish
    JournalAdvanced Materials
    Early online date7 Aug 2017
    DOIs
    Publication statusPublished - 2017

    Keywords

    • Hydrophilic carbon
    • Li-S batteries
    • Metal-organic frameworks
    • Polar graphene stacks
    • Thermal exfoliation

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