Department of Chemistry, Technische Universität Dresden, 01062, Dresden, Germany.
School of Physics & Astronomy and National Graphene Institute, University of Manchester, Manchester, M13 9PL, UK.
Adv Mater. 2017 Oct;29(37). doi: 10.1002/adma.201702829. Epub 2017 Aug 7.
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 at low relative pressure of P/P = 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.
具有可控孔结构和亲水表面的 2D 纳米碳材料在包括锂硫（Li-S）电池在内的电化学储能系统中具有巨大的应用潜力。本文报道了一种通过热剥离具有内在 2D 结构的金属有机骨架晶体来制备多层石墨烯堆叠体的方法。这种纳米碳堆叠体由高度保留的 2D 片层组成，具有高度可及的层间大孔、狭窄分布的 7Å 微孔和极性最强的孔壁。通过其在相对压力 P/P = 0.4 下极低时的超高水蒸气吸附量 14.3 mmol g-1 和不到 10.0 s 的超快润湿能力来定量其表面极性。基于结构优点，该系列亲水性多层石墨烯堆叠体被用作合适的模型阴极主体，以揭示 Li-S 电池中具有挑战性的表面化学问题。
