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High-density/efficient surface active sites on modified separators to boost Li-S batteries via atomic Co^(3+)-Se termination 被引量:3

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摘要 Various and critical electrocatalytic processes are involved during the redox reactions in the Li-S batteries,which extremely depend on the surface structure and chemical state.Recently,single-atom concept unlocks a route to maximize the use of surface-active atoms,however,further increasing the density of active site is still strictly limited by the inherent structure that single-atoms are only highly-dispersed on substrate.Herein,we provide a viewpoint that an elaborate facet design with singlecrystalline structure engineering can harvest high-density surface active sites,which can significantly boost the electrocatalyst performance for excellent Li-S batteries.Specifically,the single-crystal CoSe_(2)(scCS)exhibits three-types of terminated(011)facet,efficiently obtaining the surface with a high-rich Co^(3+)–Se bond termination,in contrast with lots of surface grain boundaries and dangling bonds in polycrystalline CoSe_(2).Surprisingly,the surface active sites concentration can reach more than 69%.As anticipated,it can provide high-density and high-efficient active sites,enormously suppressing the shuttle effect and improving the reaction kinetics via accelerating the conversion and deposition of polysulfides and Li2S.This surface lattice strategy with element terminated mode is a promising approach for designing electrocatalyst effect-based energy system,not merely for Li-S batteries.
出处 《Nano Research》 SCIE EI CSCD 2022年第8期7199-7208,共10页 纳米研究(英文版)
基金 National Natural Science Foundation of China(Nos.52070194,52073309,51902347,51932003,51872115,and 22109135) Science and Technology Development Project of Jilin Province(Nos.YDZJ202101ZYTS165,20210506034ZP,and 20210509051RQ).
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