介孔材料
阳极
复合数
兴奋剂
电化学
纳米结构
材料科学
异质结
储能
纳米颗粒
纳米复合材料
电极
化学工程
纳米技术
光电子学
复合材料
化学
物理
工程类
物理化学
生物化学
催化作用
功率(物理)
量子力学
作者
Fengyi He,Cheng Tang,Guanjia Zhu,Yadong Liu,Aijun Du,Qiaobao Zhang,Minghong Wu,Haijiao Zhang
标识
DOI:10.1007/s11426-020-9942-9
摘要
Owing to excellent conductivity and abundant surface terminals, MXene-based heterostructures have been intensively investigated as energy storage materials. However, elaborate design of the structure and composition of MXene-based hybrids towards superior electrochemical performance is still challenging. Herein, we present an ingenious leaf-inspired design for preparing a unique Sb2S3/nitrogen-doped Ti3C2Tx MXene (L-Sb2S3/Ti3C2) hybrid. In-situ TEM observations reveal that the leaflike Sb2S3 nanoparticles with numerous mesopores can well relieve the large volume changes via an inward pore filling mechanism with only 20% outward expansion, whereas highly conductive N-doped Ti3C2Tx nanosheets can serve as the robust mechanical support to reinforce the structural integrity of the hybrid. Benefiting from the structural and constituent merits, the L-Sb2S3/Ti3C2 anode fabricated exhibits a fast sodium storage behavior in terms of outstanding rate capability (339.5 mA h g−1 at 2,000 mA g−1) and high reversible capacity at high current density (358.2 mA h g−1 at 1,000 mA g−1 after 100 cycles). Electrochemical kinetic tests and theoretical simulation further manifest that the boosted electrochemical performance mainly arises from such a unique leaf-like Sb2S3 mesoporous nanostructure with abundant active sites, and enhanced Na+ adsorption energy on the heterojunction formed between Sb2S3 nanoparticles and Ti3C2 matrix.
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