Constructing Fast Transmembrane Pathways in a Layered Double Hydroxide Nanosheets/Nanoparticles Composite Film for an Inorganic Anion-Exchange Membrane

Fang Xian, Lulu Jia, Yoshiyuki Sugahara, Hairong Xue, Yusuke Yamauchi, Takayoshi Sasaki, Renzhi Ma*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Anion-exchange membranes (AEMs) with high conductivity are crucial for realizing next-generation energy storage and conversion systems in an alkaline environment, promising a huge advantage in cost reduction without using precious platinum group metal catalysts. Layered double hydroxide (LDH) nanosheets, exhibiting a remarkably high hydroxide ion (OH-) conductivity approaching 10-1 S cm-1 along the in-plane direction, may be regarded as an ideal candidate material for the fabrication of inorganic solid AEMs. However, two-dimensional anisotropy results in a substantially low conductivity of 10-6 S cm-1 along the cross-plane direction, which poses a hurdle to achieve fast ion conduction across the membrane comprising restacked nanosheets. In the present work, a composite membrane was prepared based on mixing/assembling micron-sized LDH nanosheets with nanosized LDH platelets (nanoparticles) via a facile vacuum filtration process. The hybridization with nanoparticles could alter the orientation of LDH nanosheets and reduce the restacking order, forming diversified fast ion-conducting pathways and networks in the composite membrane. As a result, the transmembrane conductivity significantly improved up to 1000-fold higher than that composed of restacked nanosheets only, achieving a high conductivity of 10-2 to 10-1 S cm-1 in both in-plane and cross-plane directions.

Original languageEnglish
Pages (from-to)51212-51221
Number of pages10
JournalACS Applied Materials and Interfaces
Volume14
Issue number45
DOIs
Publication statusPublished - 2022 Nov 16

Keywords

  • anion-exchange membrane
  • building block
  • layered double hydroxide
  • nanoparticles
  • nanosheets

ASJC Scopus subject areas

  • Materials Science(all)

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