文献类型：期刊文献

英文题名：Atomically dispersed Fe-N5 coordination structure anchored in defective g-C3 N4 as oversaturated asymmetric single-atom catalysts for accelerating redox kinetics in Li-S batteries

作者：Wang, Jun[1];Wang, Jinxin[1];Zhang, Yongzheng[1];Ma, Cheng[2];Wang, Jitong[1,3];Qiao, Wenming[1];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[3]Guangxi Univ, Sch Chem & Chem Engn, Guangxi Key Lab Petrochem Resource Proc & Proc Int, Sch Chem & Chem Engn, Nanning 530004, Peoples R China

年份：2025

卷号：209

起止页码：230

外文期刊名：JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY

收录：;EI(收录号：20242416228927);WOS:【SCI-EXPANDED(收录号:WOS:001263805000001)】；

基金：This work is partly supported by the National Natural Science Foundation of China (Nos. U21A2060 and 22178116) , the Natural Science Foundation of Shanghai (No. 22ZR141740 0) , the Fundamen- tal Research Funds for the Central Universities (Nos. 222201817001 , 50321041918013 , JKA01221601 , and JKD01241701) .

语种：英文

外文关键词：Defective; Oversaturated asymmetric; Single -atom Fe catalyst; Sulfur conversion kinetics; Lithium -sulfur batteries

摘要：Lithium-sulfur (Li-S) batteries are regarded as the most formidable competitor to lithium-ion batteries due to their superior theoretical capacity. However, the negative impact of soluble lithium polysulfide (LiPSs) and slow redox reaction kinetics seriously hamper the commercialization of Li-S batteries. In this study, a defect-rich single-atom catalyst with an oversaturated asymmetric Fe-N5 coordination structure anchored in defective g-C3 N4 (C3 N4 -Fe@rGO) is designed via an absorption-pyrolysis strategy. The twodimensional (2D) conducting C3 N4 @graphene structure with abundant defect sites accelerates the transfer and transportation of lithium ions and electrons. The oversaturated asymmetric Fe-N5 coordination structure effectively improves the adsorbility of LiPSs and accelerates the redox kinetics of sulfur species. Hence, the Li-S cell with a C3 N4 -Fe@rGO modified separator reveals a high initial capacity (1197.1 mAh g-1 at 0.2 C) and a low capacity decay rate (0.037 % per cycle after 900 cycles at 1 C). Even at high sulfur loading and extreme temperatures of 0 degrees C, it also shows good cycling performance. This work creates ideas for synthesizing oversaturated single-atom coordination environments and an efficient route to the practical realization of the Li-S batteries. (c) 2024 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.