文献类型：期刊文献

英文题名：Atomic-level Nb-doped mesoporous TiO2 as multifunctional catalyst for efficient and stable Lithium-sulfur batteries

作者：Pang, Xinlu[1];Zhang, Xixian[1];Li, Xinyuan[1];Ma, Cheng[2];Wang, Jun[1];Zhang, Yongzheng[4];Qiao, Wenming[1];Wang, Jitong[1,3];Ling, Licheng[1]

机构：[1]East China Univ Sci & Technol, Sch 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, Univ Engn Res Ctr Green Chem New Mat, Sch Chem & Chem Engn, Nanning 530004, Guangxi, Peoples R China;[4]Nantong Univ, Sch Text & Clothing, Nantong 226019, Peoples R China

年份：2026

卷号：717

外文期刊名：JOURNAL OF COLLOID AND INTERFACE SCIENCE

收录：;EI(收录号：20261320381026);WOS:【SCI-EXPANDED(收录号:WOS:001733960100001)】；

基金：This work is financially supported by the National Natural Science Foundation of China (Nos. U21A2060 and 22178116) and the Funda-mental Research Funds for the Central Universities (No. JKD01261701) .

语种：英文

外文关键词：Lithium-sulfur battery; Mesoporous TiO 2; Atomic-level Nb-doping; Lithium polysulfides conversion

摘要：Due to their exceptional electrochemical properties, lithium-sulfur batteries are regarded as one of the most promising candidates for energy storage systems. Yet, their commercialization is significantly hindered by severe shuttle effects and sluggish redox kinetics. Herein, a highly ordered mesoporous TiO2 (OMT) material with atomic-level Nb doping (Nb-OMT) was innovatively constructed as a bifunctional electrocatalyst, enabling superior performance in lithium-sulfur (Li-S) batteries. Density functional theory (DFT) calculations confirm that Nb doping could effectively enhance the electrical conductivity of the mesoporous TiO2, facilitating simultaneous adsorption and catalytic conversion of lithium polysulfides (LiPSs) on the material surface, thereby accelerating sulfur redox kinetics. Therefore, the Li-S cell with Nb-OMT-20 modified separator demonstrates an exceptional specific capacity of 1348.9 mAh g- 1 in Li-S batteries at 0.2C, meanwhile exhibiting an ultralow capacity decay rate of merely 0.036% per cycle over 900 cycles at 1C. Notably, even under challenging conditions, including a high sulfur loading of 5.12 mg cm- 2 and a low temperature of 273 K, the Li-S battery still delivers a considerable capacity of 1146.1 mAh g- 1 at 0.1C with a capacity retention of 83.4% of its capacity over 100 cycles at 0.2C, suggesting promising potential for practical applications. This work presents a novel approach to developing bifunctional electrocatalysts through atomic-scale structural modulation, thereby advancing the industrial application of Li-S batteries.