三维石墨烯复合普鲁士蓝材料的简易水热法合成及储钠性能

利用石墨烯包覆修饰提高普鲁士蓝(PB)的导电性是一种有效的改善其较差的储钠性能的方法。然而，由于普鲁士蓝的热稳定性极差，此方法一直无法得到很好的应用。因此，一种创新的低温水热合成法被提出，用于合成一种新型、具有三维导电网络的普鲁士蓝/石墨烯复合材料（PB rGO）。在低温水热过程中，抗坏血酸作为还原剂可以有效还原氧化石墨烯，同时，普鲁士蓝与石墨烯通过自组装形成复合材料；扫描电显微镜测试显示，该种复合材料具有独特的三维石墨烯导电网络结构。当作为钠离子电池正极材料时，该种普鲁士蓝/石墨烯复合材料表现出了优异的电化学性能。在电流密度为50C时比容量仍可达到61 mAh/g；在电流密度为5C时循环1000圈后容量保持率仍达到851%，因此具有很好的应用前景。

Prussian Blue Three-Dimensional Graphene Network Prepared by a Simplified Hydrothermal Method and Its Performance as Superior Sodium-Ion Battery Cathode

Enhancing the electronic conductivity of Prussian blue (PB) by graphene decoration is an effective method to improve its  sodium storage performance. However, this method  suffers from the extremely poor thermal stability of PB nanocubes. For this purpose, Prussian blue embedded in three dimensional graphene network (PB rGO) has been synthesized via a facile, low temperature hydrothermal method. The ascorbic acid was used as reducing agent in the low temperature hydrothermal synthesis process and the reduced graphene associated with Prussian blue nanocubes were self assembled into a black hydrogel. After freeze drying treatment, the graphene aerogel with Prussian blue nanocubes wrapped displays unique 3D  structure SEM results, which  provide a continuous electron conductive network. When it utilized as the cathode of sodium ion battery (SIB), the PB rGO exhibits enhanced  performance with a high specific capacity of 61 mAh/g at the current density of 50 C. It even shows excellent cyclability with 851% capacity retention over 1000 cycles at the current density of 5 C.