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Enhancing proton conduction in 2D Co-La coordination frameworks by solid-state phase transition.

Song-Song Bao1, Kazuya Otsubo, Jared M Taylor

  • 1State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, P. R. China.

Journal of the American Chemical Society
|June 20, 2014
PubMed
Summary
This summary is machine-generated.

A novel 2D 3d-4f phosphonate material (CoLa-II) transitions to a new phase (CoLa-III) above 45°C and 93% relative humidity. This phase transition significantly enhances proton conductivity by one order of magnitude.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Crystallography

Background:

  • Two-dimensional (2D) metal-organic frameworks (MOFs) are actively researched for energy applications.
  • Proton conductivity in MOFs is crucial for developing advanced proton exchange membranes.
  • Understanding phase transitions in MOFs can unlock new functionalities.

Purpose of the Study:

  • To synthesize and characterize a novel 2D 3d-4f phosphonate material.
  • To investigate the phase transition behavior of the synthesized material under varying temperature and humidity.
  • To evaluate the impact of the phase transition on the material's proton conductivity.

Main Methods:

  • Single-crystal X-ray diffraction for structural determination.
  • Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) for thermal stability.
  • Variable-temperature and variable-humidity powder X-ray diffraction (PXRD).
  • Electrochemical impedance spectroscopy (EIS) for proton conductivity measurements.

Main Results:

  • A new 2D 3d-4f phosphonate, [Co(III)La(III)(notpH)(H2O)6]ClO4·5H2O (CoLa-II), was successfully synthesized.
  • CoLa-II undergoes a reversible phase transition to [H3O][CoLa(notp)(H2O)4]ClO4·3H2O (CoLa-III) above 45 °C and 93% relative humidity.
  • The phase transition involves proton migration from intralayer to interlayer, leading to a one-order-of-magnitude increase in proton conductivity.

Conclusions:

  • The synthesized 2D 3d-4f phosphonate exhibits a humidity- and temperature-dependent phase transition.
  • This transition facilitates enhanced proton transport pathways within the material.
  • The material shows potential for applications in proton-conducting devices and membranes.