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首页> 外文期刊>Advanced functional materials >Hydroquinone versus Pyrocatechol Pendants Twisted Conjugated Polymer Cathodes for High-Performance and Robust Aqueous Zinc-Ion Batteries
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Hydroquinone versus Pyrocatechol Pendants Twisted Conjugated Polymer Cathodes for High-Performance and Robust Aqueous Zinc-Ion Batteries

机译：Hydroquinone versus Pyrocatechol Pendants Twisted Conjugated Polymer Cathodes for High-Performance and Robust Aqueous Zinc-Ion Batteries

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摘要

Aqueous zinc-ion batteries (ZIBs) have emerged as a cost-effective and safe energy storage technology but have remained a challenge in developing efficient Zn2+ hosting materials for large-scale applications. The authors have herein designed a ladder-type dithieno[3,2-b:2 ',3 '-d]pyrrole core twisting hydroquinone or pyrocatechol redox pendants as redox conducting polymer cathodes for highly-efficient and robust aqueous ZIBs. The impact of pendant configuration on the energy level, Zn2+ hosting behavior, and battery performance of these polymer electrodes are systematically investigated. Experimental and theoretical studies clearly reveal the outstanding molecular planarity and highly reversible redox reaction for hydroquinone-derived PDpBQ cathode, which can effectively tackle the bottleneck problems for ZIBs on aspects of structural stability and Zn2+ insertion/extraction dynamics. Steady capacity output upon 120 mAh g(-1) is achieved with considerable rate performance (52.5% of capacity retention at 5 A g(-1)), while pyrocatechol-derived polymer PDoBQ exhibits a sharply fading redox responsiveness (over 45%) due to restricted charge transfer and unselective zinc-ion capturing nature. This molecular design of highly conductive backbone twisting redox pendants with planar molecular plane and specific Zn2+ hosting as polymer cathodes demonstrates an effective strategy for high-performance and robust ZIBs.

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