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Ternary self-assembly of ordered metal oxide-graphene nanocomposites for electrochemical energy storage

机译：有序金属氧化物-石墨烯纳米复合材料的三元自组装，用于电化学储能

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摘要

Surfactant or polymer directed self-assembly has been widely investigated to prepare nanostructured metal oxides, semiconductors, and polymers, but this approach is mostly limited to two-phase materials, organic/inorganic hybrids, and nanoparticle or polymer-based nanocomposites. Self-assembled nanostructures from more complex, multiscale, and multiphase building blocks have been investigated with limited success. Here, we demonstrate a ternary self-assembly approach using graphene as fundamental building blocks to construct ordered metal oxide-graphene nanocomposites. A new class of layered nanocomposites is formed containing stable, ordered alternating layers of nanocrystalline metal oxides with graphene or graphene stacks. Alternatively, the graphene or graphene stacks can be incorporated into liquid-crystal-templated nanoporous structures to form high surface area, conductive networks. The self-assembly method can also be used to fabricate free-standing, flexible metal oxide-graphene nanocomposite films and electrodes. We have investigated the Li-ion insertion properties of the self-assembled electrodes for energy storage and show that the SnO_2-graphene nanocomposite films can achieve near theoretical specific energy density without significant charge/discharge degradation.
机译：已经对表面活性剂或聚合物定向的自组装进行了广泛研究，以制备纳米结构的金属氧化物，半导体和聚合物，但是这种方法主要限于两相材料，有机/无机杂化物以及纳米颗粒或基于聚合物的纳米复合材料。已经研究了来自更复杂，多尺度和多相构建块的自组装纳米结构，但获得的成功有限。在这里，我们展示了使用石墨烯作为基本结构单元来构建有序金属氧化物-石墨烯纳米复合材料的三元自组装方法。形成一类新的层状纳米复合材料，其包含具有石墨烯或石墨烯堆叠的纳米晶金属氧化物的稳定，有序交替层。可替代地，可以将石墨烯或石墨烯堆叠体结合到液晶模板的纳米孔结构中以形成高表面积的导电网络。自组装方法还可以用于制造自立的，柔性的金属氧化物-石墨烯纳米复合膜和电极。我们已经研究了用于能量存储的自组装电极的锂离子插入特性，并显示SnO_2-石墨烯纳米复合膜可以实现接近理论的比能量密度，而不会出现明显的充电/放电降解。

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