在双金属三硫化物中调节旋转状态,以促进硫逆氧运动
Hong Li1,2,3, Mingyan Chuai4, Xiao Xiao1
1Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute & Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Journal of the American Chemical Society
|October 3, 2023
概括
本研究介绍FeCoPS3/NCs作为硫电池的新型催化剂,通过调节电子结构和自旋状态来提高性能. 这导致Li-S细胞的稳定性和容量保留显著改善.
科学领域:
- 材料科学
- 电化学
- 催化剂
背景情况:
- -硫 (Li-S) 电池面临着缓慢反应动力学和多硫化物运输的挑战.
- 现有的Li-S催化剂研究主要涉及聚硫化物吸附和转化,忽视了电子结构调制.
研究的目的:
- 研究催化剂电子结构,特别是旋转状态配置对Li-S电池性能的影响.
- 通过定制的旋转和轨道相互作用增强硫氧化还原催化剂的新型催化剂的开发.
主要方法:
- 嵌入添加的空心碳纳米立方体 (FeCoPS3/NCs) 中的双金属三硫化物合成.
- 分析FeCoPS3的旋转状态配置与其催化活性之间的关系.
- 使用FeCoPS3/NC主体对Li-S电池的电化学性能进行评估.
主要成果:
- FeCoPS3表现出轨道旋转分裂,过渡到高旋转状态,具有更多不配对的3d电子和上升的能量水平.
- 量身定制的电子结构增强了电荷传输,修改了d频段中心,并优化了多硫化物吸附.
- 具有FeCoPS3/NC宿主的Li-S细胞表现出异常稳定性,在1000个周期内每周期仅有0. 037%的容量衰减.
结论:
- 催化剂电子结构,特别是旋转和轨道拓,对于先进的Li-S电池性能至关重要.
- 对于高性能Li-S电池来说,FeCoPS3/NC是一种有前途的宿主材料.
- 该研究通过调节旋转和轨道拓控制的几何配置来设计催化剂的一般策略.
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