电子阴性诱导的Jahn-Teller扭曲增强了对不对称Cu单原子催化剂的Li-S转换
Hengyue Xu1,2
1Department of Chemistry, Tsinghua University, Beijing 100084, China.
The journal of physical chemistry. A
|September 10, 2025
概括
具有不对称协调的工程铜单原子催化剂加速硫电池化学反应. 这种新的Jahn-Teller扭曲策略增强了电子结构,以改善能量存储.
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
- 催化剂是一种催化剂.
背景情况:
- 硫 (Li-S) 电池在理论上具有很高的能量密度,但其动力学和多硫化物穿速度较慢.
- 单原子催化剂 (SAC) 通过与中间体相互作用来提高Li-S电池的性能.
- 控制活性站点的电子结构对于优化催化活性至关重要.
研究的目的:
- 设计和研究基于Cu的SAC,以非对称的协调来加速Li-S化学.
- 了解电子负性诱导的不对称性如何影响Cu中心的电子结构和催化活性.
- 建立一个定量指标,用于评估和设计触媒活性站点中的Jahn-Teller扭曲.
主要方法:
- 基于Cu的SAC的计算设计,具有不同的不对称协调环境.
- 密度函数理论 (DFT) 计算分析电子结构,电荷分布和反应路径.
- 计算Jahn-Teller扭曲指数 (Q_JT) 来量化电子不对称性.
- 机械分析Li-S中间体与催化剂活性部位的相互作用.
主要成果:
- 设计的基于Cu的SAC具有不对称的协调,诱导局部电子不对称,并放大Jahn-Teller扭曲.
- 确定CuN3F是一个高度活跃的部位,表现出强大的Cu(II) Jahn-Teller扭曲和低的自由能量屏障 (0.19 eV) 减少硫.
- 开发了一个定量Q_JT指数,有效地区分电子Jahn-Teller活动.
- 证明 CuN3F 的动态 Jahn-Teller 扭曲优化了 Cu d 轨道与 Li-S 中间 LUMO 的对齐,增强了动力学.
结论:
- 电子负性驱动的局部不对称性是调整SAC电子结构的可行策略.
- 雅恩-泰勒扭曲工程显著提高了Li-S化学中的催化活性.
- 开发的Q_JT指数为设计用于储能应用的下一代催化剂提供了有价值的工具.
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