通过引入新的活性碳站点,推动MXenes的理论储存极限
Xin Cao1, Yuchun Liu2, Huan Xia1
1School of Materials Science and Engineering, Southeast University, Nanjing, Jiangsu, 211189, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|September 11, 2024
概括
在碳化物MXenes (Ti3C2Tx) 的缺陷周围优化当地的环境显著提高了储能能力和电池性能. 这种方法解锁了新的活跃站点,以更快地充电和更持久的电池.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 表面科学是一门学科.
背景情况:
- 表面驱动电容存储是高功率电极和快速充电电池的关键.
- 缺陷工程通常专注于缺陷本身,忽视周围当地环境对表面性能的影响.
- 需要一个合适的材料平台来探索当地的缺陷环境的作用.
研究的目的:
- 调查局部原子环境周围缺陷对Ti3C2Tx MXenes电容储存的影响.
- 通过调节缺陷附近来提高电极性能,展示一种新的策略.
- 为了在MXenes.中实现创纪录的理论储能.
主要方法:
- 利用密度函数理论 (DFT) 计算来预测MXene在调制局部原子环境中的性能.
- 通过化学剪刀在子层内采用原子裁剪,以暴露新的活性部位.
- 制造并测试了修改后的MXene电极,以提高速度性能和循环稳定性.
主要成果:
- 在孔附近确定了新的碳部位,这些部位激活电化学惰性表面,导致理论上的储能量为291 mAh g-1.
- 在修改后的MXenes中实现了前所未有的速度性能和循环稳定性.
- 碳暴露较高的MXenes显示超过200mAh的g-1容量,20个月后>80%的保留率.
结论:
- 调节故障周围的局部环境是设计高性能电极材料的有效策略.
- 暴露sp3混合碳活性位点显著增强容量储存.
- 这项工作为开发具有卓越速度能力和寿命的先进电池开辟了新的途径.
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