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Two-Dimensional Polymer Synthesized via Solid-State Polymerization for High-Performance Supercapacitors.

Wei Liu^1,2,3, Mani Ulaganathan⁴, Ibrahim Abdelwahab^1,3

¹Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543 Singapore.

|December 16, 2017

Summary

This summary is machine-generated.

Researchers developed novel two-dimensional conjugated aromatic polymers (CAPs) for energy storage. These polymers exhibit excellent performance in asymmetric supercapacitors, demonstrating high specific capacitance and outstanding cycle stability.

Keywords:

2-D materials C−C coupling conjugated porous polymers solid-state polymerization supercapacitors

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Area of Science:

Materials Science
Polymer Chemistry
Energy Storage

Background:

Two-dimensional (2-D) polymers offer unique properties for energy storage due to heteroatoms, porosity, and layered structures.
These features facilitate redox chemistry and ion diffusion, crucial for electrochemical applications.

Purpose of the Study:

To synthesize conjugated aromatic polymers (CAPs) with potential for advanced energy storage.
To investigate the structural and electrochemical properties of CAPs derived from phenazine-based precursors.

Main Methods:

Solid-state polymerization of phenazine-based precursor crystals (2-TBTBP and 3-TBQP) via thermal debromination.
Mechanical exfoliation of polymerized material (CAP-2) into ultrathin sheets.
Characterization using Raman spectroscopy and pore size analysis.
Fabrication and testing of asymmetric supercapacitors using CAP-2.

Main Results:

Conjugated aromatic polymers (CAPs) synthesized in quantitative yield.
CAP-2, polymerized from pre-layered monomers, exfoliated into ordered ultrathin sheets.
CAP-2 exhibits a dominant pore size of approximately 0.8 nm.
Asymmetric supercapacitors made with CAP-2 achieved a specific capacitance of 233 F g⁻¹ at 1.0 A g⁻¹.
Outstanding cycle performance was observed for the supercapacitors.

Conclusions:

The synthesized 2-D CAPs possess desirable characteristics for energy storage applications.
The layered structure and controlled porosity of CAP-2 contribute to its high electrochemical performance.
CAP-2 represents a promising material for high-performance asymmetric supercapacitors.