空位增强的Sb-N4位置用于氧气减少反应和气电池
Ying Zhang1, Zhi-Wen Chen2, Xu Liu1
1Key Laboratory of Automobile Materials (Jilin University), Ministry of Education, and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
Nano letters
|March 29, 2024
概括
这项研究引入了一种新型的反单原子催化剂 (SAC),可显著提高氧降解反应 (ORR) 的性能. 催化剂在空气电池中表现出极高的效率和稳定性.
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
- 催化剂是一种催化剂.
背景情况:
- 基于P块金属的单原子催化剂 (SACs) 显示出氧降解反应 (ORR) 的前景,因为它们的芬顿无活性性质和独特的p电子.
- 一个主要的挑战是,由于封闭的d10电子配置,它们的内在活动有限.
研究的目的:
- 开发一种有效的基于的SAC,具有增强的ORR活性.
- 研究碳空缺在提高催化剂性能方面的作用.
- 为了评估催化剂的稳定性和空气电池中的应用.
主要方法:
- 用碳空位增强的Sb-N4活性中心制造一个反单原子催化剂 (Sb-SA).
- 使用高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 和X射线吸收细结构 (XAFS) 的表征.
- 在性介质中对ORR性能和稳定性的电化学评估.
- 密度函数理论 (DFT) 计算以阐明催化机制.
主要成果:
- 开发的Sb-SA-N-C催化剂表现出高正半波潜力为0.905V的ORR.
- 在性环境中观察到优异的结构稳定性.
- DFT的计算表明,碳空缺会削弱Sb-OH*吸附,从而促进ORR.
结论:
- 在Sb-SA-N-C中的碳空位增强的Sb-N4活性中心显著改善了ORR活动.
- 催化剂对实际应用具有很大的潜力,Zn-空气电池的高功率密度证明了这一点.
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