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MOF-Based Solid-State Proton Conductors Obtained by Intertwining Protic Ionic Liquid Polymers with MIL-101.

Shunlin Zhang1,2, Yuxin Xie1, Rosie J Somerville2

  • 1College of Chemical Engineering, State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing, 211816, China.

Small (Weinheim an Der Bergstrasse, Germany)
|June 15, 2023
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Summary

Researchers developed new solid-state proton conductors using metal-organic framework (MOF) MIL-101 and protic ionic liquid polymers (PILPs). The PILP@MIL-101 composite with HSO4- anions exhibits excellent proton conductivity, offering a promising alternative for fuel cells.

Keywords:
metal-organic frameworks (MOFs)polymersprotic ionic liquidsproton conductivitysuperprotonic conductors

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) are explored for proton exchange membranes.
  • Current proton conductors face limitations in performance and stability.
  • Developing advanced solid-state proton conductors is crucial for energy technologies.

Purpose of the Study:

  • To synthesize and characterize novel proton conductors based on MIL-101 and protic ionic liquid polymers (PILPs).
  • To investigate the proton transport properties and mechanism in the new composite materials.
  • To evaluate the potential of these materials as alternatives to existing proton exchange membranes.

Main Methods:

  • In situ polymerization of protic ionic liquid (PIL) monomers within the MIL-101 MOF structure.
  • Synthesis of PILP@MIL-101 composites with varying anions.
  • Characterization of proton conductivity using electrochemical impedance spectroscopy.
  • Structural analysis of PIL monomers via single crystal X-ray diffraction.

Main Results:

  • PILP@MIL-101 composites retained the structural integrity and water stability of MIL-101.
  • The composite with HSO4- anions demonstrated superprotonic conductivity of 6.3 × 10^-2 S cm^-1 at 85°C and 98% relative humidity.
  • Strong hydrogen bonding interactions within PIL monomers were observed, facilitating proton transport.

Conclusions:

  • PILP@MIL-101 composites represent a new class of highly efficient solid-state proton conductors.
  • The enhanced proton transport is attributed to the intertwined PILPs within the MOF structure.
  • These materials show significant promise for applications in fuel cells and other electrochemical devices.