Science Advances

Supplementary Materials

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  • Supplementary Materials and Methods
  • fig. S1. SEM characterizations of as-synthesized and anion-exchanged LDHs.
  • fig. S2. XRD characterizations of as-synthesized and anion-exchanged LDHs.
  • fig. S3. AFM characterizations of LDH nanosheets with different sizes.
  • fig. S4. Schematic drawings for nanosheets on comb electrodes.
  • fig. S5. Impedance spectra of bare comb electrodes acquired at 30°C and 80% RH.
  • fig. S6. SEM characterizations of LDH nanosheet multilayers.
  • fig. S7. Hydroxyl ion conduction of LDH nanosheet multilayers.
  • fig. S8. Hydroxyl ion conduction of multilayer assemblies composed of micro- and nano-sized LDH nanosheets.
  • fig. S9. Temperature dependences of in-plane ionic conductivity for a representative sample of micro–Mg-Al LDH nanosheet multilayers deposited on comb electrodes during a large time interval of over half a year to show the long-term stability of exfoliated LDH nanosheets in terms of hydroxyl ion conduction.
  • fig. S10. SEM characterizations of LDH nanosheet membranes.
  • fig. S11. Cross-plane hydroxyl ion conduction of LDH nanosheets acquired with lamellar membranes.
  • fig. S12. Isotope effect experiments.
  • fig. S13. XRD patterns of Mg-Al and Co-Al LDH nanosheet multilayers.
  • fig. S14. Representative Nyquist plots of impedance for pellets containing Co-Al-CO32− LDH platelets.
  • fig. S15. Hydroxyl ion conduction of LDH platelet-based pellets.

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