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Ionic Covalent Organic Frameworks with Spiroborate Linkage.

Ya Du1, Haishen Yang1, Justin Michael Whiteley2

  • 1Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, 80309, USA.

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|December 24, 2015
PubMed
Summary
This summary is machine-generated.

Novel ionic covalent organic frameworks (ICOFs) demonstrate high surface areas for H2 and CH4 adsorption. These stable materials also exhibit promising lithium-ion conductivity for next-generation batteries.

Keywords:
covalent organic frameworksgas adsorptionionic polymerslithium-ion conductivityspiroborates

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Area of Science:

  • Materials Science
  • Chemistry
  • Chemical Engineering

Background:

  • Covalent organic frameworks (COFs) are crystalline porous polymers with tunable properties.
  • Developing stable COFs with enhanced functionalities for energy storage and gas adsorption remains a challenge.

Purpose of the Study:

  • To construct a novel class of ionic covalent organic frameworks (ICOFs) utilizing spiroborate linkages.
  • To investigate the gas adsorption properties (H2, CH4) and electrochemical performance of these ICOFs.

Main Methods:

  • Synthesis of ICOFs featuring sp(3)-hybridized boron anionic centers and tunable countercations via spiroborate linkages.
  • Characterization of ICOF properties including BET surface area, thermal stability, and hydrolysis resistance.
  • Evaluation of gas adsorption capacities at relevant temperatures and pressures.
  • Measurement of room-temperature lithium-ion conductivity and transference number.

Main Results:

  • Synthesized ICOFs exhibit high BET surface areas (up to 1259 m²/g).
  • Achieved significant H2 (3.11 wt%) and CH4 (4.62 wt%) adsorption capacities.
  • Demonstrated excellent thermal stability and resistance to hydrolysis.
  • Observed room-temperature lithium-ion conductivity (3.05 × 10⁻⁵ S/cm) with a high Li⁺ transference number (0.80 ± 0.02).

Conclusions:

  • The novel spiroborate linkage strategy provides a facile route to highly stable ICOFs.
  • These ICOFs show potential as efficient adsorbents for alternative energy sources (H2, CH4).
  • The ionic nature and stability make these ICOFs promising candidates for solid lithium battery electrolytes and separators.