Fully Conjugated Covalent Porous Polymers for Highly Efficient Solar-Thermal Conversion.
basic_science · Level V
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- Record sourced from PubMed, PMID 41591289.
- Also identified by DOI 10.1021/acs.nanolett.5c05861.
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Abstract
Solar-thermal water evaporation is a promising strategy for the clean water production. Developing photothermal conversion materials with high efficiency and stability is both urgent and challenging. Herein, we report two fully conjugated bipyranylidene-based microporous polymers (DP-CMP1 and DP-CMP2) for the first time, that feature broad light absorption, superior photothermal efficiency, and outstanding durability. Under the illumination of 660 nm laser with 100 mW cm<sup>-2</sup>, the temperature of DP-CMP1 drastically increased from 29.1 to 174.7 °C within 4 s. Furthermore, an interfacial heating evaporation system based on DP-CMP1 achieved high solar thermal water evaporation rates of 3.83 and 3.77 kg m<sup>-2</sup> h<sup>-1</sup> under 1 sun illumination for pure water and seawater, with excellent energy conversion efficiency of 97.5 and 96.6%, respectively. Multiple spectroscopic and theoretical investigations reveal DP-CMP1 is intrinsically an outstanding photothermal material owing to its small band gap, fast nonradiative combination rate, large nonadiabatic coupling value, and stronger electron-phonon coupling.