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首页> 外文期刊>Chemistry: A European journal >K2Mn4O8/Reduced Graphene Oxide Nanocomposites for Excellent Lithium Storage and Adsorption of Lead Ions
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K2Mn4O8/Reduced Graphene Oxide Nanocomposites for Excellent Lithium Storage and Adsorption of Lead Ions

机译：K2Mn4O8 /还原的氧化石墨烯纳米复合材料具有出色的锂存储和铅离子吸附能力

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摘要

Ion diffusion efficiency at the solid-liquid interface is an important factor for energy storage and adsorption from aqueous solution. Although K2Mn4O8 (KMO) exhibits efficient ion diffusion and ion-exchange capacities, due to its high interlayer space of 0.70nm, how to enhance its mass transfer performance is still an issue. Herein, novel layered KMO/reduced graphene oxide (RGO) nanocomposites are fabricated through the anchoring of KMO nanoplates on RGO with a mild solution process. The face-to-face structure facilitates fast transfer of lithium and lead ions; thus leading to excellent lithium storage and lead ion adsorption. The anchoring of KMO on RGO not only increases electrical conductivity of the layered nanocomposites, but also effectively prevents aggregation of KMO nanoplates. The KMO/RGO nanocomposite with an optimal RGO content exhibits a first cycle charge capacity of 739mAhg(-1), which is much higher than that of KMO (326mAhg(-1)). After 100 charge-discharge cycles, it still retains a charge capacity of 664mAhg(-1). For the adsorption of lead ions, the KMO/RGO nanocomposite exhibits a capacity of 341mgg(-1), which is higher than those of KMO (305mgg(-1)) and RGO (63mgg(-1)) alone.
机译：固液界面处的离子扩散效率是能量存储和从水溶液中吸附的重要因素。尽管K2Mn4O8（KMO）表现出有效的离子扩散和离子交换能力，但由于其0.70nm的高层间距，如何提高其传质性能仍然是一个问题。本文中，通过用温和的固溶过程将KMO纳米板锚固在RGO上来制造新型的层状KMO /还原氧化石墨烯（RGO）纳米复合材料。面对面的结构有利于锂和铅离子的快速转移;从而导致出色的锂存储和铅离子吸附。 KMO在RGO上的锚固不仅增加了层状纳米复合材料的电导率，而且有效地防止了KMO纳米板的聚集。具有最佳RGO含量的KMO / RGO纳米复合材料展现出739mAhg（-1）的第一循环充电容量，该容量远高于KMO（326mAhg（-1））。经过100次充放电循环后，它仍然保持664mAhg（-1）的充电容量。对于铅离子的吸附，KMO / RGO纳米复合材料的吸附容量为341mgg（-1），高于单独的KMO（305mgg（-1））和RGO（63mgg（-1））。

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