Conventional three‐dimensional graphene cellular materials (GCMs) from chemically derived graphene oxide undergo low mechanical strength, severe plastic deformation and poor electrical conductivity. Herein, ultralight, ultraelastic, excellent mechanical and electrically conductive GCMs have been successfully prepared by the self‐assembly of graphene nanosheets by extensive hydrogen bonds generated from a glycolic acid crosslinker. Meanwhile, ethanol‐water solution is used to dramatically restrict the volume expansion of water converting into ice crystal during the freeze process. Eventually, the GCMs exhibit ultralow densities of about 4.3 mg cm⁻³, and can be fabricated on a large scale (volume of ∼350 cm³). The GCMs have a maximum reversible strain of ca. 90% in the whole density range from 4.3 mg cm⁻³ to 25.3 mg cm⁻³. Young's moduli (E) are from 13.7 kPa (ρ=4.3 mg cm⁻³) to 125.1 kPa (ρ=25.3 mg cm⁻³), with the scale of E∼ρ^2.1, and the exponent n is less than the GCMs previously reported. The GCMs also have high electrical conductivities of about 98.1 S/m (ρ=25.3 mg cm⁻³). Our work provides a facile method for the fabrication of ultralight, highly compressible and conductive GCMs, paving the way towards future potential applications in energy storage and conversions, adsorbents for the environment, etc.

中文翻译：

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具有增强的机械和电气性能的超轻，高压缩石墨烯蜂窝材料

由化学衍生的氧化石墨烯制成的传统三维石墨烯蜂窝材料（GCM）的机械强度低，塑性变形严重且导电性差。在此，通过乙醇酸交联剂产生的广泛氢键对石墨烯纳米片的自组装，成功地制备了超轻，超弹性，优异的机械和导电GCM。同时，乙醇水溶液被用来显着限制冷冻过程中转化为冰晶的水的体积膨胀。最终，GCM表现出约4.3 mg cm ^-3的超低密度，并且可以大规模制造（体积约350 cm ³）。GCM的最大可逆应变约为。整个密度的90％在4.3mg cm ^-3至25.3mg cm ^{-3的范围内}。杨氏模量（ë）是从13.7千帕（ρ = 4.3毫克厘米^-3）至125.1千帕（ρ = 25.3毫克厘米^-3），与规模ë〜ρ ^2.1，且指数n低于大气环流模型先前报告。GCM还具有约98.1 S / m的高电导率（ρ = 25.3 mg cm ^-3）。我们的工作为制造超轻，高度可压缩和导电的GCM提供了一种简便的方法，为将来在储能和转化，环境吸附剂等方面的潜在应用铺平了道路。