2020
DOI: 10.1039/c9ta11451c
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In situ engineered ZnS–FeS heterostructures in N-doped carbon nanocages accelerating polysulfide redox kinetics for lithium sulfur batteries

Abstract: Building heterostructures containing dissimilar coupling components with different bandgaps can promote interfacial reaction kinetics and accelerate charge carrier transport for Li–S batteries.

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Cited by 130 publications
(75 citation statements)
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“…It can be observed that the MCN/S electrode exhibits the lowest R ct of 46.8 Ω and R s of 3.6 Ω, smaller than those of BMC/S (163.4 and 3.9 Ω) and CNT/S (210.2 and 3.8 Ω) electrodes, which can be attributed to the enhanced interfacial reaction kinetics and fast Li + /e − transfer in MCN/S electrode. [50][51][52] Moreover, the ex situ EIS spectra of the CNT/S, BMC/S, and MCN/S electrodes during discharge process are shown in new Figure S9b,c in the Supporting Information, the R ct value decreases with the conversion between S 8 and Li 2 S. It is noted that there is an obvious decrease in the interface resistance of the BMC/S electrode compared with CNT/S during the discharge process, which demonstrates that the Mo 2 C optimized conversion kinetics. Moreover, the R ct of MCN/S electrode is much less than BMC/S and CNT/S electrodes in the whole discharge process, indicating the superior reaction interphase of MCN.…”
Section: Resultsmentioning
confidence: 99%
“…It can be observed that the MCN/S electrode exhibits the lowest R ct of 46.8 Ω and R s of 3.6 Ω, smaller than those of BMC/S (163.4 and 3.9 Ω) and CNT/S (210.2 and 3.8 Ω) electrodes, which can be attributed to the enhanced interfacial reaction kinetics and fast Li + /e − transfer in MCN/S electrode. [50][51][52] Moreover, the ex situ EIS spectra of the CNT/S, BMC/S, and MCN/S electrodes during discharge process are shown in new Figure S9b,c in the Supporting Information, the R ct value decreases with the conversion between S 8 and Li 2 S. It is noted that there is an obvious decrease in the interface resistance of the BMC/S electrode compared with CNT/S during the discharge process, which demonstrates that the Mo 2 C optimized conversion kinetics. Moreover, the R ct of MCN/S electrode is much less than BMC/S and CNT/S electrodes in the whole discharge process, indicating the superior reaction interphase of MCN.…”
Section: Resultsmentioning
confidence: 99%
“…Along this way, Li and co‐workers proposed a ZnS–FeS heterostructure wrapped in N‐doped carbon (ZnS–FeS/NC) nanocage as a multifunctional sulfur host. [ 173 ] As indicated from DFT calculations, the ZnS–FeS heterostructures with distinctly different intrinsic energy bandgaps of ≈0.8 eV for FeS and ≈4.9 eV for ZnS generated a strong built‐in electric field at the heterointerface and therefore accelerated the redox reaction of LiPSs in this respect (Figure 17c). Furthermore, the hollow structures provided a large space for anchoring of soluble LiPSs to eventually combine the merits of adsorption and catalysis.…”
Section: Design and Regulation Strategies Of Catalytic Materialsmentioning
confidence: 97%
“…Thus far, key efforts have been devoted to designing reasonable heterostructure system to realize the synergy of catalysis and adsorption, such as TiO 2 –TiN, VO 2 –VN, MoN–VN, VTe 2 @MgO, WS 2 –WO 3 , TiO 2 –TiN, V 2 O 3 /V 8 C 7 , NiO–NiCo 2 O 4 , SnS 2 /SnO 2 , and ZnS–FeS, etc. [ 29,62,168–174 ] In this section, we focus on the effective construction strategies for heterostructure with respect to simultaneously improved adsorption and catalysis throughout catalytic materials design.…”
Section: Design and Regulation Strategies Of Catalytic Materialsmentioning
confidence: 99%
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“…Zhang and co‐workers proposed ZnS–FeS heterostructures incorporated into N‐doped carbon with various inherent energy bandgaps involving 0.8 eV for FeS, while 4.9 eV for ZnS (Figure 18g). [ 278 ] Therefore, a powerful E‐field in the heterointerface was generated due to the prominent energy bandgaps between the two components, which could efficiently facilitate polysulfide conversion. Moreover, the dynamics analyses and DFT computation also verified that the heterostructure‐rich cathodes could promote charge transfer, enhance the polysulfides confinement, and accelerate the surface redox dynamics, thus resulting in an outstanding rate capacity and favorable cycling stability (Figure 18h,i).…”
Section: Catalytic Conversion Of Polysulfides By Mofs‐derived Nanostructuresmentioning
confidence: 99%