文献类型：期刊文献

英文题名：Tailored ZnO-ZnS heterostructure enables a rational balancing of strong adsorption and high catalytic activity of polysulfides for Li-S batteries

作者：Zhang, Wanyu[1];Hong, Donghui[1];Su, Zhe[1];Yi, Shan[1];Tian, Liying[1];Niu, Bo[1];Zhang, Yayun[1,2];Long, Donghui[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：53

起止页码：404

外文期刊名：ENERGY STORAGE MATERIALS

收录：;EI(收录号：20223912793799);WOS:【SCI-EXPANDED(收录号:WOS:000868947800001)】；

基金：Acknowledgments This work was supported by National Natural Science Foundation of China (No. 22078100, No. 21878091 and No. 22008073) , and Funda-mental Research Funds for the Central Universities.

语种：英文

外文关键词：Li -S battery; ZnO-ZnS; rGO heterostructure; High catalytic activity; Strong adsorption; Functional coatings

摘要：Electrocatalytic conversion of polysulfides is an effective strategy to alleviate shuttle effects for Li-S batteries, but achieving the synergistic effects between strong adsorption and high catalytic activity with a single catalyst is still challenging. Herein, we report the rational balancing of strong adsorption and high catalytic activity on the tailored ZnO-ZnS/reduced graphene oxide (rGO) heterostructure to achieve significantly enhanced conversion of polysulfides. By integrating the merits of adsorptive ZnO, catalytic ZnS and conductive rGO, the ZnO-ZnS/rGO heterostructures could enable an unrestricted adsorption-diffusion-conversion of polysulfides. Moreover, by controlling the sulfurization degree, the ZnO-ZnS/rGO heterostructure with ZnO/ZnS ratio of 7:3 performs the optimized overall performance, indicative of a trade-off between adsorption and catalytic activity. When served as functional coatings onto the separators, the ZnO-ZnS/rGO heterostructures could greatly promote the redox kinetics and retrain the polysulfides shuttling. The pure sulfur cathode with the 7ZnO-3ZnS/rGO modified separator delivers a high initial specific capacity of 1186 mAh g-1 at 0.5 degrees C and a low capacity fading of 0.06% per cycle over 500 cycles at 1 degrees C. Even with high sulfur loading of 7.6 mg cm-2, a high reversible specific capacity of 671 mAh g-1 at 1 degrees C can still be retained. This work presents a rational method to tailor the heterostructure catalysts for boosting electrocatalytic conversion of polysulfides towards high-performance Li-S batteries.