根结节启发的化与硫兴奋诱导的高性能硫电池的相位过渡
Wei Yan1, Jun Chen2, Abdul Mateen1
1Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China.
ACS applied materials & interfaces
|January 10, 2026
概括
灵感来自豆类根结节,一种新的化催化剂 (CoSe@C) 提高了硫电池的性能. 这种仿生设计增强了电子传输和催化转换,从而获得了特殊的稳定性和容量.
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:
- 豆类根结节共生为层次的质量运输和高效的生物固定提供了一个模型.
- 硫 (Li-S) 电池在理论上具有很高的能量密度,但存在多硫化物穿和循环稳定性差等问题.
- 开发先进的催化剂对于改善Li-S电池性能至关重要,通过促进聚硫化物转化和增强充电传输.
研究的目的:
- 设计和合成一个仿生催化剂,灵感来自豆类根结节,以提高硫电池的性能.
- 通过硫 doping 调查 selenide 的相变和电子结构调制.
- 阐明合成材料用于聚硫化物转换的催化机制及其对电池性能的影响.
主要方法:
- 在碳纳米纤维 (CoSe@C) 上支持化的合成,具有仿生层次结构.
- 控制的硫注射诱导从六边形 (h-CoSe) 到正角形 (o-CoSeS) 化的相变.
- 使用X射线衍射和X射线光电子谱等技术,对催化剂的结构,相位和电子性质进行表征.
- 密度函数理论 (DFT) 计算以了解电子结构和催化机制.
- 使用o-CoSeS@C的修改分离器制造和电化学测试Li-S电池.
主要成果:
- 成功合成了一种新的仿生催化剂CoSe@C,模仿了层次化质量运输的根节点架构.
- 硫注射诱导了向高旋转状态的正交形o-CoSeS的相位过渡,增强了催化活性.
- DFT的计算证实,o-CoSeS的电子配置增强了多硫化物 (LiPSs) 的吸附,并加速了氧化还原动力学.
- 带有o-CoSeS@C修改分离器的Li-S电池表现出高的初始放电容量 (1509 mAh g-1在0.1 C) 和显著的循环稳定性 (0.057%的衰变每周期超过1000个循环在1 C).
结论:
- 生物模拟层次结构和o-CoSeS优化的电子状态协同增强了Li-S电池中的催化活性和质量/电荷传输.
- 该研究展示了一种设计高性能催化剂的新策略,通过模仿自然系统和调整过渡金属电子结构来设计高性能催化剂.
- 这些发现为先进的储能应用,特别是Li-S电池的催化剂优化提供了有价值的原子层次见解.
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