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Synergistically induced dual-interfacial interactions in iron-nickel sulfides heterojunction encapsulated by N, S-codoped carbon matrix heightened ion-transport kinetics for sodium-storage
Zhao, Wenxi1; Zhang, Chenke3; Li, Yadong1; Yu, Leyong4; Ma, Xiaoqing2,3
2023-07-15
摘要Exploring bimetallic sulfides of diverse metal species with well-defined nanoarchitectures and distinctive interfacial interactions is indispensable for advanced sodium-storage systems in achieving rapid electron/ion transfer kinetics, optimizing structural durability, and enhancing electrochemical energy storage. In this regard, the fabrication of a spindle-like hierarchical hollow nanocage with the dual heterointerfaces was reported uti-lizing N, S co-doped carbon support encapsulating hollow FeS2/NiS heterojunction (FeS2/NiS@N,S-C) through the critical steps of facile dopamine self-polymerization, followed by hydrolyzation, carbonization and further sulphuration. Benefiting from the great superiorities of superior conductivity, excellent structural robustness, abundant active reaction sites, efficient charge transport pathways, as well as fast ion-migration kinetics bestowed by creating an synergistically induced dual interfacial interaction in the ingenious nanoarchitecture, the FeS2/NiS@N,S-C composites render a significantly optimized comprehensive performance of Na+-storage, yielding a highly competitive capacity of 598.0 mAh g-1 after 600 cycles at 1.0 A g-1, and desirable cycle stability with supernormal rate capability (362.6 mAh g-1 after 1950 cycles at 20.0 A g-1), one of the best performances for FeS2- or NiS based heterojunctions. Meanwhile, the redox mechanism involving initial inter-calation reaction and following conversion stage was uncovered detailly by a set of ex-situ experimental char-acterizations. Theoretical evidences drawn from density functional theory calculations illustrate that the formation of dual heterointerfaces in FeS2/NiS@N,S-C composites enables good conductivity, optimizes Na+ adsorption energy, and reduces activation energy for Na+ migration, which facilitates ion/electron migration and enhances reaction kinetics of the electrode.
关键词Dual heterointerfaces Metal sulfides heterojunction FeS2 NiS@NS-C composites Sodium ion batteries Anode
DOI10.1016/j.cej.2023.143596
发表期刊CHEMICAL ENGINEERING JOURNAL
ISSN1385-8947
卷号468页码:12
通讯作者Yu, Leyong(lyyu@cigit.ac.cn) ; Ma, Xiaoqing(maxiaoqing1112@163.com)
收录类别SCI
WOS记录号WOS:001011447100001
语种英语