A highly conductive and robust anion conductor obtained via synergistic manipulation in intra- and inter-laminate of layered double hydroxide nanosheets

作者：He, Xueyi; Cao, Li; He, Guangwei; Zhao, Anqi; Mao, Xunli; Huang, Tong; Li, Yan; Wu, Hong; Sun, Jie; Jiang, Zhongyi^*

来源：Journal of Materials Chemistry A, 2018, 6(22): 10277-10285.

DOI：10.1039/c8ta02193g

• METAL-ORGANIC FRAMEWORKS
• POSITIVELY CHARGED NANOSHEETS
• ALKALINE FUEL-CELL
• ION CONDUCTION
• EXCHANGE MEMBRANES
• QUATERNIZED POLYSULFONE
• NANOCOMPOSITE MEMBRANES
• MOLECULAR INTERACTION
• TRANSPORT
• HYDROTALCITE

Layered double hydroxides (LDH), bearing trivalent cationic charge centers and hydroxyl slabs, hold great promise for use in efficient solid-state ion conductors. In this study, a composite membrane with ionconducting 2D channels was prepared based on exfoliated LDH nanosheets and quaternized polyvinyl alcohol via a filtration process. The LDH laminates, which were formed by the stacking of exfoliated LDH nanosheets, primarily afforded the conductive performance of the membranes. Within the intra-laminate galleries of LDH, charge-balancing anions determined the channel size, water absorption capacity and electrostatic interactions inside the 2D channels. As a result, hydroxide ion transport was greatly affected by the anionic species present. The organic moieties inside the inter-laminate galleries of LDH conferred hydrogen bonds and covalent linkages at the organic-inorganic interfaces, resulting in a nacre-mimetic structure, leading to the improved mechanical properties of the composite membranes. The synergistic manipulation of composition and interactions within the intra- and inter-laminate galleries endowed the novel anion conductors with both high conductivity (156.3 mS cm(-1) at 80 degrees C) and good mechanical performance (a tensile strength of 48.4 MPa and toughness of 2.09 MJ m(-3)).

• 出版日期2018-6-14
• 单位天津大学