Two-dimensional graphene has become one of the most intensively explored carbon allotropes in materials science owing to its attractive features, such as its outstanding physicochemical properties. To advance its practical application, the fabrication of self-assembled 2D graphene sheets into 3D nitrogen-doped graphene aerogels (NGA) with novel functions is becoming essential. Herein, the first attempts to modify graphene with Plectranthus amboinicus (PA), to introduce double nitrogen doping, and to prepare NGA by a natural drying (ND) method are reported. Natural drying was achieved by increasing the pore structure of NDPA-NGA using PA to simultaneously cross-link the graphene sheets and increase the stiffness of the sample. Meanwhile, we used ammonia and urea as double nitrogen sources to achieve an N-doping amount as high as 12.06 atom %. In addition, NDPA-NGA exhibited superelastic properties (with 95% maximal strain and almost no loss after 60 replicates), a high oil absorption capacity, and an excellent electrochemical performance (371 and 204 F g^–1 at current densities of 1 and 50 A g^–1, respectively, corresponding to a retention of 54.987%). In addition, NDPA-NGA also demonstrated predominant refractoriness, low density, hydrophobicity, and physicochemical stability, which make this material an excellent candidate for use in energy storage, catalysis, and other applications.

中文翻译：

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由植物提取物改性的天然干燥，双氮掺杂3D石墨烯气凝胶，可用于多功能应用

二维石墨烯因其引人注目的特性（例如出色的理化特性）而成为材料科学中研究最广泛的碳同素异形体之一。为了提高其实际应用，将自组装的2D石墨烯片材制造成具有新颖功能的3D氮掺杂石墨烯气凝胶（NGA）变得至关重要。在这里，首次尝试用竹节兰（Plectranthus amboinicus）修饰石墨烯（PA），引入双氮掺杂，并通过自然干燥（ND）方法制备NGA。通过使用PA增加NDPA-NGA的孔结构同时交联石墨烯片并增加样品的硬度，可以实现自然干燥。同时，我们使用氨和尿素作为双氮源，使N掺杂量高达12.06％（原子）。此外，NDPA-NGA具有超弹性（最大应变为95％，重复60次后几乎没有损失），高吸油量和出色的电化学性能（电流密度为1和50时为371和204 F g ^–1）克^–1分别对应保留率54.987％）。此外，NDPA-NGA还显示出主要的耐火性，低密度，疏水性和物理化学稳定性，这使该材料成为用于能量存储，催化和其他应用的极佳候选材料。