Self-assembly of 3D reduced graphene oxide (rGO) sponges has received increasing attention in recent years. By far, chemical reduction, hydrothermal treatment, template-directed chemical vapor deposition, and electrodeposition are the typical methods. Herein, the utilization of zinc nanoparticles as a reducing agent to fabricate 3D rGO sponges is reported. The relative negative standard electrode potential of zinc to graphene oxide (GO) allowed the spontaneous formation of the rGO-Zn hydrogel. Zinc-free 3D rGO sponges were recovered by acid leaching of the zinc species and freeze-drying. This room-temperature electroless gelation is dependent on pH. The structure and electrochemical performance of the as-synthesized rGO sponges were determined by the mass ratio of Zn to GO. Comprehensive physical and chemical characterizations were utilized to understand the 3D structure evolution of the rGO sponges. The rGO sponge, with an optimized texture, showed high capacitance and good stability in 1 m H2 SO4 electrolyte.

中文翻译：

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纳米石墨在环境条件下介导的氧化石墨烯自凝结。

近年来，3D还原氧化石墨烯（rGO）海绵的自组装受到越来越多的关注。到目前为止，典型的方法是化学还原，水热处理，模板定向化学气相沉积和电沉积。在本文中，报道了利用锌纳米颗粒作为还原剂来制造3D rGO海绵。锌对氧化石墨烯（GO）的相对负标准电极电势允许rGO-Zn水凝胶自发形成。通过锌物质的酸浸和冷冻干燥回收了无锌的3D rGO海绵。这种室温化学凝胶取决于pH。合成的rGO海绵的结构和电化学性能由Zn与GO的质量比决定。利用综合的物理和化学特性来了解rGO海绵的3D结构演变。具有优化结构的rGO海绵在1 m H2 SO4电解质中显示出高电容和良好的稳定性。