Phase Engineering of MXene Derivatives Via Molecular Design for High‐Rate Sodium‐Ion Batteries
Phase Engineering of MXene Derivatives Via Molecular Design for High‐Rate Sodium‐Ion Batteries
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DOI：
10.1002/eem2.12692
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发表时间：
2024-01
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影响因子：
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通讯作者：
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
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作者：
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
自2019年以来，对MXene衍生物的研究急剧上升；进一步的发展需要对特定功能进行合理的设计。在此，通过在MXene涂层中选择合适的官能团进行分子设计，我们实现了衍生物的双N掺杂，氮掺杂TiO2@nitrogen掺杂碳纳米片（N‐TiO2@NC），以达到低温下活性锐钛矿TiO2和高温下碳活化之间的平衡。现场热解SVUV - PIMS过程证明，400°C下产生的NH3还原环境对同步相工程至关重要。由于具有导电性和表面Na+可用性，N‐TiO2@NC具有长期稳定性，实现了更高的界面电容式钠存储。经过5000次循环后，在2a g−1下可实现超过100mah g−1。提出的设计可以扩展到其他MXene，并巩固不断增长的MXene衍生产品家族用于储能。
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.