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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引用次数: 0
摘要
自 2019 年以来,对 MXene 衍生物的研究急剧增加;要取得进一步进展,需要对特定功能进行合理设计。在此,我们通过分子设计,在 MXene 涂层中选择合适的官能团,实现了衍生物--氮掺杂 TiO2@氮掺杂碳纳米片(N-TiO2@NC)的双 N 掺杂,从而在低温下的活性锐钛矿 TiO2 和高温下的碳活化之间取得平衡。原位热解 SVUV-PIMS 工艺证明,在 400 °C 温度下产生的 NH3 还原环境对于同时进行的相工程至关重要。N-TiO2@NC 同时具有导电性和表面 Na+ 可用性,可实现更高的界面电容式钠存储,并具有长期稳定性。经过 5000 次循环后,在 2 A g-1 的条件下可达到 100 mAh g-1。所提出的设计可扩展到其他二氧化二烯,并巩固不断壮大的二氧化二烯衍生物储能家族。
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.
期刊介绍:
Energy & Environmental Materials (EEM) is an international journal published by Zhengzhou University in collaboration with John Wiley & Sons, Inc. The journal aims to publish high quality research related to materials for energy harvesting, conversion, storage, and transport, as well as for creating a cleaner environment. EEM welcomes research work of significant general interest that has a high impact on society-relevant technological advances. The scope of the journal is intentionally broad, recognizing the complexity of issues and challenges related to energy and environmental materials. Therefore, interdisciplinary work across basic science and engineering disciplines is particularly encouraged. The areas covered by the journal include, but are not limited to, materials and composites for photovoltaics and photoelectrochemistry, bioprocessing, batteries, fuel cells, supercapacitors, clean air, and devices with multifunctionality. The readership of the journal includes chemical, physical, biological, materials, and environmental scientists and engineers from academia, industry, and policy-making.