Okra-Like Fe7S8/C@ZnS/N-C@C with Core-Double-Shelled Structures as Robust and High-Rate Sodium Anode
- 1 September 2020
- Vol. 16 (35), e1907641
- https://doi.org/10.1002/smll.201907641
Abstract
Core-multishelled structures with controlled chemical composition have attracted great interest due to their fascinating electrochemical performance. Herein, a metal-organic framework (MOF)-on-MOF self-templated strategy is used to fabricate okra-like bimetal sulfide (Fe7S8/C@ZnS/N-C@C) with core-double-shelled structure, in which Fe7S8/C is distributed in the cores, and ZnS is embedded in one of the layers. The MOF-on-MOF precursor with an MIL-53 core, a ZIF-8 shell, and a resorcinol-formaldehyde (RF) layer (MIL-53@ZIF-8@RF) is prepared through a layer-by-layer assembly method. After calcination with sulfur powder, the resultant structure has a hierarchical carbon matrix, abundant internal interface, and tiered active material distribution. It provides fast sodium-ion reaction kinetics, a superior pseudocapacitance contribution, good resistance of volume changes, and stepwise sodiation/desodiation reaction mechanism. As an anode material for sodium-ion batteries, the electrochemical performance of Fe7S8/C@ZnS/N-C@C is superior to that of Fe7S8/C@ZnS/N-C, Fe7S8/C, or ZnS/N-C. It delivers a high and stable capacity of 364.7 mAh g(-1)at current density of 5.0 A g(-1)with 10 000 cycles, and registers only 0.00135% capacity decay per cycle. This MOF-on-MOF self-templated strategy may provide a method to construct core-multishelled structures with controlled component distributions for the energy conversion and storage.Keywords
Funding Information
- National Natural Science Foundation of China (51702366, 21875285)
- Taishan Scholar Foundation of Shandong Province (ts201511019)
- Fundamental Research Funds for the Central Universities (17CX02037A)
- Key Technology Research and Development Program of Shandong (2019JZZY010331)
This publication has 54 references indexed in Scilit:
- Raman spectroscopy as a versatile tool for studying the properties of grapheneNature Nanotechnology, 2013
- Recent Advances in Metal Oxide‐based Electrode Architecture Design for Electrochemical Energy StorageAdvanced Materials, 2012
- Tuning upconversion through energy migration in core–shell nanoparticlesNature Materials, 2011
- Recent developments in nanostructured anode materials for rechargeable lithium-ion batteriesEnergy & Environmental Science, 2011
- MOF@MOF: microporous core–shell architecturesChemical Communications, 2009
- Crystalline-Amorphous Core−Shell Silicon Nanowires for High Capacity and High Current Battery ElectrodesNano Letters, 2009
- Multifunctional Uniform Nanoparticles Composed of a Magnetite Nanocrystal Core and a Mesoporous Silica Shell for Magnetic Resonance and Fluorescence Imaging and for Drug DeliveryAngewandte Chemie-International Edition, 2008
- The Design of a LiFePO4/Carbon Nanocomposite With a Core–Shell Structure and Its Synthesis by an In Situ Polymerization Restriction MethodAngewandte Chemie-International Edition, 2008
- Raman spectroscopy of graphene and graphite: Disorder, electron–phonon coupling, doping and nonadiabatic effectsSolid State Communications, 2007
- Characterization of amorphous and nanocrystalline carbon filmsMaterials Chemistry and Physics, 2006