文献类型：期刊文献

英文题名：Ultra-fine Co nanoparticles in-situ anchored on porous conductive nanosheets as efficient electrocatalysts for promoting sulfur redox reaction kinetics

作者：Wu, Siyu[1];Li, Xiang[1];Guan, Qinghua[2,3];Zhang, Xin[1];Zhang, Yongzheng[1,4];Wang, Jian[2,3,5];Shen, Chunyin[1];Lin, Hongzhen[2,3];Wang, Yanli[1];Zhan, Liang[1]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Suzhou Inst Nanotech & Nanob, I Lab, Suzhou 215123, Peoples R China;[3]Chinese Acad Sci, Suzhou Inst Nanotech & Nanob, CAS Key Lab Nanophoton Mat & Devices, Suzhou 215123, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, 130 Meilong Rd, Shanghai 200237, Peoples R China;[5]Helmholtz Inst Ulm HIU, D-89081 Ulm, Germany

年份：2023

卷号：337

外文期刊名：MATERIALS LETTERS

收录：;EI(收录号：20230613541542);WOS:【SCI-EXPANDED(收录号:WOS:000968047200001)】；

基金：Acknowledgements S. W. and X. L contributed equally to this work. This work was financially supported by the National Key R & D Program of China (2021YFA1201503) , National Natural Science Foundation of China (Nos. 22075081, 21972164, 22279161) , the Fundamental Research Funds for the Central Universities (JKD01231701) , and the Natural Science Foundation of Jiangsu Province (BK 20210130) . Dr. J. Wang thanks the fellowship awarded by the Alexander von Humboldt Foundation.

语种：英文

外文关键词：Lithium sulfur battery; Electrocatalysts; Sulfur redox reaction; Co; N co -doping; Mesoporous carbon nanosheet

摘要：Lithium-sulfur (Li-S) batteries are considered as one of the most promising energy storage devices due to their high theoretical energy density. However, the sluggish conversion kinetics and the polysulfides shuttling cause terrible capacity attenuation, impeding the practical developments. Herein, the Co/N co-doped mesoporous carbon nanosheet is developed after the pyrolysis of metal organic framework on graphene oxide layer, which is further explored as kinetics promotor towards advanced Li-S batteries. In this structure, the mesoporous carbon nanosheets with large specific surface area serve as the polysulfide trappers by physical constraint and the ultra -fine Co nanoparticles provide chemical adsorption and electrocatalytic capability for polysulfides, thus effec-tively suppressing the shuttle effect and accelerating the reaction kinetics. As a result, the Li-S batteries with modified kinetic modulation separators exhibit a high capacity of 585.3 mAh g-1 after 500 cycles at 1.0 C and excellent rate capability (511.2 mAh g- 1 at 3 C).