一个具有强大的化学吸收和快速转换效应的Mott-Schottky异质连接,用于室温Na-S电池
Ting Wang1, Wenqi Li1, Yujun Fu1
1School of Materials and Energy, LONGi Institute of Future Technology, Lanzhou University, Lanzhou, 730000, China.
Small (Weinheim an der Bergstrasse, Germany)
|January 4, 2024
概括
研究人员开发了一种新的铁/铁二硫化物异质连接,用于室温硫 (RT Na-S) 电池的多孔碳. 这种设计增强了多硫化的捕获和催化,大大提高了电池的容量和稳定性.
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:
- 室温-硫 (RT Na-S) 电池面临的挑战包括容量低和衰变由于缓慢的动力学和聚硫化物穿.
- 有效的聚硫化物 (NaPSs) 管理需要具有化学吸收和催化作用的集成电催化剂的硫宿主.
研究的目的:
- 为RT Na-S电池设计和合成一个Mott-Schottky异质连接 (Fe/FeS2-PC) 作为硫主体.
- 研究铁 (Fe),铁二硫化物 (FeS2) 和多孔碳 (PC) 对电化学性能的协同作用.
- 为了增强NaPSs的化学吸收,催化和电荷转移,以提高电池的稳定性和容量.
主要方法:
- 理论计算指导了Fe/FeS2异质连接的设计.
- 在一个多孔的碳基质 (Fe/FeS2-PC) 上固定的Fe/FeS2元件的合成.
- 在RT Na-S电池中Fe/FeS2-PC@S阴极的电化学表征.
主要成果:
- 铁/FeS2-PC阴极显示了增强的NaPSs化学吸收 (Fe),催化 (FeS2) 和电荷转移 (内置电场).
- 在0.2 A g-1的150个循环后,达到815 mAh g-1的高可逆容量.
- 在600个周期以5 A g-1 (每周期0.07%的衰变) 后,表现出极好的稳定性,516 mAh g-1).
结论:
- Fe/FeS2异质连接有效地减轻了穿效应,并提高了RT Na-S电池的电化学性能.
- 这种综合电催化剂设计为开发高度稳定和高效的RT Na-S电池提供了有前途的战略.
- 该研究强调了Mott-Schottky异质连接在先进的储能应用中的潜力.
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