Graphene Oxide-Based Solid Electrolytes with 3D Prepercolating Pathways for Efficient Proton Transport
Graphene Oxide-Based Solid Electrolytes with 3D Prepercolating Pathways for Efficient Proton Transport
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基于氧化石墨烯的固体电解质与三维预渗透途径的有效质子传输
DOI：
10.1002/adfm.201804944
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发表时间：
2018-12-12
影响因子：
19
通讯作者：
Jiang, Zhongyi
中科院分区：
文献类型：
--
作者：
Cao, Li;Wu, Hong;Jiang, Zhongyi
氧化石墨烯(GO)具有前所未有的快速离子传输能力，已成为固体电解质的新兴构件。然而，复合电解液中较差的穿透平面传输性能，以及CO纳米片层的团聚和不连续是有效质子传导的主要障碍。本文采用冷冻浇注的方法设计了3D预渗流磺化GO(3D SGO)网络，并将聚合物电解质注入到3D SGO网络中制备了复合电解质。SGO层压板被很好地集成到渗流纳米结构中，这使得3D SGO网络具有高质子传导能力(比最先进的固体电解质Nafion膜高五倍)和各向同性传输特性。预渗策略避免了SGO纳米片的团聚，并提供了贯穿整个电解液的连续质子传导路径。因此，复合电解质在平面内和穿过平面的质子导电性方面都表现出显著的同时改善，这是现有的2D纳米填料-聚合物电解质所不能达到的。特别是，最高的穿透平面质子电导率达到0.29 S厘米(-1)，性能优于目前的2D纳米填料基复合电解质。这种预渗策略可能会开辟一条新的途径，充分利用2D材料固有的快速传导来有效地传输不同的离子/分子。
Graphene oxide (GO) with unprecedentedly fast ion transport ability has become emerging building blocks for solid electrolytes. However, the inferior through plane transport properties, along with the agglomeration and discontinuity of CO nanosheets in composite electrolytes represent a major obstacle for efficient proton conduction. Herein, a 3D prepercolating sulfonated GO (3D sGO) network is designed by a freeze-casting method, and further fabricated composite electrolytes by infusing polymer electrolytes into the 3D sGO networks. The sGO laminates are well integrated into percolative nanoarchitectures, which enables the 3D sGO networks a high proton conduction capability (five times higher than Nafion membrane, a state-of-art solid electrolyte) and isotropic transport feature. The prepercolating strategy avoids sGO nanosheets agglomeration and provides continuously proton-conductive pathways that percolate throughout the whole electrolytes. Consequently, the composite electrolytes exhibit a remarkable and simultaneous improvement in both in-plane and through-plane proton conductivity, which is unattainable for the existing 2D nanofiller-polymer electrolytes. Particularly, the highest through-plane proton conductivity reaches 0.29 S cm(-1), outperforming the current 2D nanofiller-based composite electrolytes. This prepercolating strategy may open a new avenue to fully utilizing the inherently rapid conduction of 2D materials for efficient transport of diverse ions/molecules.