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Download fileOne-Pot Synthesis of an FeS@GQDs Composite for Lithium Storage with Coal Tar Pitch as ″Natural GQDs″
journal contribution
posted on 2022-01-28, 19:34 authored by Feng Shi, Quanrun Liu, Jingjie Zhang, Baolin Xing, Guangxu Huang, Jianbo Jia, Chuanxiang ZhangGraphene
quantum dots (GQDs), a newly emerging zero-dimensional
material, have achieved widespread interest in energy storage applications.
However, the complicated preparation processes of GQDs involving harsh
reagents/conditions, cumbersome purification procedures, or costly
precursors hinder their practical use. Herein, we reveal a low-cost
and eco-friendly solvothermal method to obtain an FeS@GQDs composite,
with coal tar pitch (CTP) as ″natural GQDs″. When evaluated
as an anode material in lithium-ion batteries (LIBs), this composite
delivers an outstanding reversible capacity of 718.7 mAh g–1 over 200 cycles at 100 mA g–1; as comparison,
the reversible capacity of pure FeS is only 16.3 mAh g–1 in the same situation. Furthermore, the FeS@GQDs composite shows
much better rate performance and higher initial Coulombic efficiency
than pure FeS. These prominent electrochemical properties of the FeS@GQDs
composite profit from the successful coupling between FeS and GQDs
by forming C–S–C, which provides a large specific surface
area and well-developed porosity, leading to improved electrical conductivity
and enhanced structure stability. In terms of energy storage, this
approach is a potential way to prepare GQDs-based composites on a
large scale without the expensive precursors, harsh reagents, as well
as complex preparation conditions.
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prominent electrochemical propertiesnewly emerging zerolarge scale withoutimproved electrical conductivityfriendly solvothermal methodenhanced structure stabilitycumbersome purification procedurescomplicated preparation processescoal tar pitchachieved widespread interestcostly precursors hinder7 mah g3 mah goutstanding reversible capacityforming c –complex preparation conditionsenergy storage applicationsgqds composite profit– creversible capacityenergy storageexpensive precursorsgqds compositecomposite deliverssuccessful couplingprepare gqdspractical usepotential waypot synthesislibs ),ion batteriesharsh reagentsgqds ),dimensional materialdeveloped porositybased compositesanode material200 cycles