Three-dimensional (3D) hierarchical reduced graphene oxide (rGO) aerogel with a finely tuned C/O ratio of 11.8 can be used for various applications because of its high specific surface area (925.27 m² g^–1), specific pore volume of 6.46 cm³ g^–1, and light weight as well as excellent electrical conductivity and electrochemical property. The permselectivity of the 3D rGO aerogels with different C/O ratios was investigated using neutral, positive, and negative redox mediators. The neutral and cationic redox mediators permselectively adsorb within the rGO aerogels via π–π and noncovalent electrostatic interactions, respectively. In contrast, the anionic redox mediator does not adsorb within the 3D rGO aerogels due to the repulsion force. The 3D rGO can be used as an absorbent for toxic dye removal such as methylene blue (MB). The in situ electrochemical spectroscopy suggests that the 3D rGO prefers to adsorb the reduced form of MB. For lithium-storage capability, the 3D rGO aerogel is ideal since it can be used as the high-energy anode of lithium batteries. It can provide a reversible specific capacity of over 600 mAh g^–1 at 0.5 A g^–1 and over 1000 mAh g^–1 at 0.1 A g^–1, which are much higher than a theoretical maximum value (372 mAh g^–1) of graphite.

中文翻译：

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具有超高孔容的石墨烯气凝胶，可吸附有机染料和高能锂电池

精细调整的C / O比为11.8的三维（3D）分层还原氧化石墨烯（rGO）气凝胶可用于各种应用，因为它具有较高的比表面积（925.27 m ² g ^–1）， 6.46厘米³ g ^–1，重量轻以及出色的导电性和电化学性能。使用中性，正性和负性氧化还原介体研究了具有不同C / O比的3D rGO气凝胶的渗透选择性。中性和阳离子氧化还原介体分别通过π–π和非共价静电相互作用选择性吸附在rGO气凝胶中。相反，由于排斥力，阴离子氧化还原介体不吸附在3D rGO气凝胶中。3D rGO可用作吸收剂，用于去除有毒染料，例如亚甲基蓝（MB）。在原位电化学光谱法表明3D rGO倾向于吸附还原形式的MB。对于锂的存储能力，3D rGO气凝胶是理想的，因为它可以用作锂电池的高能阳极。它在0.5 A g ^–1时可提供超过600 mAh g ^–1的可逆比容量，在0.1 A g ^–1时可提供超过1000 mAh g ^–1的可逆比容量，远高于理论最大值（372 mAh g ^–1）。石墨。