Interface-coupling in FeOOH/MXene Heterojunction for Highly Reversible Lithium-ion Storage
Materials Today Energy(2020)
Abstract
ABSTRACT Recently, MXene coupling with active nanomaterials show considerable potential for energy storage applications. However, the complicated fabrication of MXene based composites and their low Li+ storage reversibility impede the further application for lithium-ion batteries. Herein, as a proof of concept, a novel architecture of β-FeOOH quantum dots grafted on Ti3C2 flakes has been realized via a one-step facile immersion method. The crumple Ti3C2 MXene in the synthetic hybrids functions as a favorable matrix to load FeOOH dots due to its open framework, superior electrical conductivity and low energy barrier of Li+ diffusion. In virtue of the strong interfacial interactions of the formed heterojunctions between alkali-Ti3C2 matrix and FeOOH, the hybrid enables the enhanced kinetics of charge transfer and stable interfacial structure. Consequently, the FeOOH@3D-MX electrode exhibits superior high-rate capability (286.1 mAh g-1 at 10 A g-1) and particularly durable lithium-ion storage with no capacity decay over 500 cycles (572.3 mAh g-1 after 500 cycles at 500 mA g-1). The enhanced Li+ storage mechanism of FeOOH/MXene heterostructures is also evidenced by density functional theory calculations and kinetics analyses. This work exploits a facile strategy to build high-performance anode composite and paves the way to exploring their energy storage mechanisms.
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Key words
MXene,Quantum dots,Heterojunction,DFT calculations,Electrochemical energy storage
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