用S装饰的Mo2C作为LiO电池系统的有效催化剂.
Yanhong Ding1, Zhichao Gao1, Rongpeng Lin1
1College of Materials and Advanced Manufacturing, Hunan University of Technology Zhuzhou 412007 People's Republic of China zhuyirong2004@163.com.
RSC advances
|July 9, 2025
概括
对Mo2C的硫注射通过提高动力学和稳定性来提高氧电池的性能. 这种新的S@Mo2C阴极材料为先进的能量存储提供了更高的容量和更长的循环寿命.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧 (Li-O2) 电池在理论上具有很高的能量密度,但其动力学不佳,超电位高,不稳定.
- 目前的阴极材料限制了Li-O2电池的实际应用.
研究的目的:
- 为了提高Mo2C阴极材料的电化学性能,用于-O2电池.
- 研究硫对Mo2C电子结构和催化活性的影响.
主要方法:
- 水热合成被用来制备用硫修饰的Mo2C (S@Mo2C) 阴极材料.
- 描述技术包括X射线衍射 (XRD),传输电子显微镜 (TEM) 和X射线光电子谱学 (XPS).
- 电化学性能通过特定容量,超电位和循环稳定性测试来评估.
主要成果:
- S@Mo2C的特定容量为3955 mA hg-1,明显高于商业的Mo2C (508 mA hg-1).
- 充电和放电过量的潜力减少了53.6%至0.26 V.
- 在250个周期后,容量保留率保持在77.8%,表明稳定性有所改善.
- 硫剂形成了MoS2/MoS3异构,增强了导电性和氧降低/沉 (ORR/OER) 活性.
- 硫兴奋剂促进了无形Li2O2的形成,并抑制了绝缘Li2O2的积累.
结论:
- 硫化是一种有效的策略,可以提高Li-O2电池的Mo2C基阴极材料的性能.
- 该S@Mo2C材料表现出卓越的电化学性能,包括高容量,低超电位和优异的循环稳定性.
- 这项研究为设计用于先进能源存储系统的高效催化剂提供了新的途径.
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