Two-Dimensional Polymer Synthesized via Solid-State Polymerization for High-Performance Supercapacitors.
basic_science · Level V
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- Record sourced from PubMed, PMID 29244482.
- Also identified by DOI 10.1021/acsnano.7b08354.
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Abstract
Two-dimensional (2-D) polymer has properties that are attractive for energy storage applications because of its combination of heteroatoms, porosities and layered structure, which provides redox chemistry and ion diffusion routes through the 2-D planes and 1-D channels. Here, conjugated aromatic polymers (CAPs) were synthesized in quantitative yield via solid-state polymerization of phenazine-based precursor crystals. By choosing flat molecules (2-TBTBP and 3-TBQP) with different positions of bromine substituents on a phenazine-derived scaffold, C-C cross coupling was induced following thermal debromination. CAP-2 is polymerized from monomers that have been prepacked into layered structure (3-TBQP). It can be mechanically exfoliated into micrometer-sized ultrathin sheets that show sharp Raman peaks which reflect conformational ordering. CAP-2 has a dominant pore size of ∼0.8 nm; when applied as an asymmetric supercapacitor, it delivers a specific capacitance of 233 F g<sup>-1</sup> at a current density of 1.0 A g<sup>-1</sup>, and shows outstanding cycle performance.