Precisely regulating of the surface structure of crystal-line materials to improve their catalytic activity for lithium polysulfides is urgently needed for high-performance lithium-sulfur (Li-S) batteries.Herein,high-index faceted iron oxide (Fe2O3) nanocrystals anchored on reduced graphene oxide are developed as highly efficient bifunctional electrocatalysts,effectively improving the electrochemical performance of Li-S batteries.The theoretical and experimental results all indicate that high-index Fe2O3 crystal facets with abundant unsaturated coordinated Fe sites not only have strong adsorption capacity to anchor polysulfides but also have high catalytic activity to facilitate the redox transformation of polysulfides and reduce the decomposition energy barrier of Li2S.The Li-S batteries with these bifunctional electrocatalysts exhibit high initial capacity of 1521 mAh g-1 at 0.1 C and excellent cycling performance with a low capacity fading of 0.025％ per cycle during 1600 cycles at 2 C.Even with a high sulfur loading of 9.41 mg cm-2,a remarkable areal capacity of 7.61 mAh cm-2 was maintained after 85 cycles.This work provides a new strategy to improve the catalytic activity of nanocrystals through the crystal facet engineering,deepening the comprehend-ing of facet-dependent activity of catalysts in Li-S chemistry,affording a novel perspective for the design of advanced sulfur electrodes.

Bo Jiang;Da Tian;Yue Qiu;Xueqin Song;Yu Zhang;Xun Sun;Huihuang Huang;Chenghao Zhao;Zhikun Guo;Lishuang Fan;Naiqing Zhang

State Key Laboratory of Urban Water Resource and Environment,School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,People's Republic of China;School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,People's Republic of China;Academy of Fundamental and Interdisciplinary Sciences,Harbin Institute of Technology,Harbin 150001,People's Republic of China

纳微快报（英文）

[1]Bo Jiang;Da Tian;Yue Qiu;Xueqin Song;Yu Zhang;Xun Sun;Huihuang Huang;Chenghao Zhao;Zhikun Guo;Lishuang Fan;Naiqing Zhang-.High-Index Faceted Nanocrystals as Highly Efficient Bifunctional Electrocatalysts for High-Performance Lithium-Sulfur Batteries)[J].纳微快报（英文）,2022(02):324-338

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