在双原子嵌入式西洛中轨道杂交加速-硫电池的硫逆氧反应
Ning Gong1, Yuanzhi Zhu2, Xuewen Hu3
1School of Carbon Neutrality Science and Engineering, Anhui University of Science and Technology, Hefei, 231131, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 27, 2025
概括
在氧基的双原子催化剂 (DAC) 通过优化硫还原反应 (SRR) 来提高硫 (Li-S) 电池的效率. FeNi-DA显示出优越的催化活性,为先进的Li-S电池阴极铺平了道路.
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
- 计算化学计算化学
背景情况:
- 硫 (Li-S) 电池具有高的理论能量密度,但受到缓慢的硫还原反应 (SRR) 的限制.
- 单原子催化剂 (SAC) 是有前途的,但双原子催化剂 (DAC) 由于更灵活的活性位点,提供了增强的催化性能.
- 西洛是一种极性二维材料,正在探索其在Li-S电池催化剂中稳定双金属原子的潜力.
研究的目的:
- 设计和选新型过渡金属双原子嵌入式素 (TM1TM2-DA) 作为Li-S电池的高效阴极材料.
- 为了研究硫还原反应 (SRR) 和硫化 (Li2S) 氧化背后的催化机制.
- 确定用于预测催化剂性能和指导未来催化剂设计的关键描述符.
主要方法:
- 采用第一原则计算,构建和分析了一系列过渡金属双原子嵌入式锡洛 (TM1TM2-DA).
- 计算选确定了FeNi-DA作为最佳催化剂,基于其在SRR和Li2S氧化中的性能.
- 电子结构分析,包括d电子密度再分配和轨道杂交,用于理解催化增强.
主要成果:
- 在SRR和Li2S氧化中,FeNi-DA表现出卓越的催化活性,以及优良的电子导电性和有利的聚硫化吸附.
- FeNi-DA的增强的催化性能归因于Fe和Ni原子之间的协同轨道杂交,从而优化了d电子密度.
- 该研究确定了易于获得的描述符 (Dc和Ls),以有效选具有较低SRR障碍的TM1TM2-DA催化剂.
结论:
- 嵌入于氧烯的过渡金属双原子催化剂代表了提高Li-S电池阴极性能的有希望的策略.
- 尼-DA成为一种高效的催化剂,由特定的电子结构修改驱动.
- 开发的描述符为加速为Li-S电池开发新的高性能催化剂提供了有价值的工具.
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