文献类型：期刊文献

英文题名：Mediated by Polymer Intercalation Differential: Molecule Steric Hindrance Triggers 1T-2H MoS2 Heterostructures for Ultrafast and Ultrastable Li+/Na+ Storage

作者：Huang, Chen[1]; Xu, Tian[2]; Yu, Xuebin[2]; Zhang, Junye[1]; Wang, Qiuya[1]; Xu, Le[3]; Zhang, Lili[3]; Yang, Jie[1]; Wang, Linlin[4]; Chen, Luyang[1]

机构：[1] Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Department of Materials Science, Fudan University, Shanghai, 200433, China; [3] Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry & Chemical Engineering, Huaiyin Normal University, Huaian, 223300, China; [4] Institute for Sustainable Energy/College of Science, Shanghai University, Shanghai, 200444, China

年份：2025

卷号：21

期号：52

外文期刊名：Small

收录：EI(收录号：20254619512988)

语种：英文

外文关键词：Density functional theory - Doping (additives) - Intercalation - Ions - Lithium compounds - Lithium-ion batteries - Molecules - Molybdenum compounds - Nanosheets - Sodium-ion batteries - Sulfur compounds

摘要：The organic molecule of phytic acid is innovatively utilized to block the edges of partial MoS2 with steric effect to achieve differential intercalation of polypyrrole. After annealing, the intercalated MoS2 nanosheet retains the 1T phase with a large spacing of 0.98nm, while the unintercalated regions transform into the 2H phase with a small spacing (0.62nm), thus forming a 1T-2H MoS2 heterostructure. This structure integrates the high electrochemical activity of the 1T phase with the excellent stability of the 2H phase. Furthermore, MoS2 nanosheets are anchored by nitrogen-doped carbon (NC) nanotubes and coated with a N/P co-doped carbon (NPC) protective layer, forming a unique sandwich hierarchical structure (NC@T/H–MoS2@NPC). The synergistic effect of the 1T-2H MoS2 heterostructure and the unique hierarchical structure enhances ion diffusion kinetics and structural integrity. This electrode demonstrates remarkable cycling life, with 8 000 cycles at 10 A g?1 in Li-ion batteries and 15 000 cycles at 5 A g?1 in Na-ion batteries. The 1T and 2H phases exhibit different storage Na+/Li+ behaviors under ex situ X-ray diffraction tests. The density functional theory results reveal the heterostructure and NC layer modulate the Fermi level, reducing Li+/Na+ migration energy barrier and optimizing energy storage. ? 2025 Wiley-VCH GmbH.