Phase Engineering of MXene Derivatives Via Molecular Design for High-Rate Sodium-Ion Batteries
Hui Zhang , Xingwu Zhai , Xin Cao , Zhihao Liu , Xinfeng Tang , Zhihong Hu , Hang Wang , Zhandong Wang , Yang Xu , Wei He , Wei Zheng , Min Zhou , ZhengMing Sun
Energy & Environmental Materials ›› 2024, Vol. 7 ›› Issue (5) : e12692
Phase Engineering of MXene Derivatives Via Molecular Design for High-Rate Sodium-Ion Batteries
Since 2019, research into MXene derivatives has seen a dramatic rise; further progress requires a rational design for specific functionality. Herein, through a molecular design by selecting suitable functional groups in the MXene coating, we have implemented the dual N doping of the derivatives, nitrogen-doped TiO2@nitrogen-doped carbon nanosheets (N-TiO2@NC), to strike a balance between the active anatase TiO2 at low temperatures, and carbon activation at high temperatures. The NH3 reduction environment generated at 400 °C as evidenced by the in situ pyrolysis SVUV-PIMS process is crucial for concurrent phase engineering. With both electrical conductivity and surface Na+ availability, the N-TiO2@NC achieves higher interface capacitive-like sodium storage with long-term stability. More than 100 mAh g-1 is achieved at 2 A g-1 after 5000 cycles. The proposed design may be extended to other MXenes and solidify the growing family of MXene derivatives for energy storage.
high-rate sodium-ion batteries / molecular design / MXene derivative / phase engineering
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2024 The Authors. Energy & Environmental Materials published by John Wiley & Sons Australia, Ltd on behalf of Zhengzhou University.
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