高硫兴奋剂增强Mn-N4旋转状态并提高氧降低反应在酸性和性介质中的性能
Yuan Li1, Hao-Ran Wu1, Yue Yu1
1College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|February 10, 2025
概括
这项研究引入了一种新型的--碳-硫 (Mn-N-C-S) 催化剂,可显著提高氧降解反应 (ORR) 的活性和稳定性. 这一突破为可持续能源转换技术提供了一个有希望的替代方案.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 金组无金属催化剂对于可持续的能源转化至关重要.
- 基于的催化剂具有较低的毒性和更好的耐用性,但其活性低于Fe-N-C催化剂.
- 提高基催化剂的活性和稳定性对于推进燃料电池和电池技术至关重要.
研究的目的:
- 开发一种高效且稳定的基于的催化剂,用于氧降解反应 (ORR).
- 为了研究硫兴奋剂对--碳 (Mn-N-C) 催化剂性能的影响.
- 探索新催化剂在燃料电池和金属空气电池中的潜力.
主要方法:
- 设计了一个Mn-N-C-S催化剂,使用硫介导的高协调兴奋剂策略.
- 在性和酸性介质中评估ORR活性的催化剂性能.
- 在H2-O2燃料电池和Zn-空气电池中测试了催化剂性能.
- 利用理论计算来理解硫 doping 的机制.
主要成果:
- 在性介质中达到0.94V,在酸性介质中达到0.80V的半波潜力.
- 在H2-O2燃料电池中,已证明高峰功率密度为0.82 W cm-2;在Zn-空气电池中,高峰功率密度为0.264 W cm-2.
- 实验和理论结果表明,硫 doping 增强了 Mn-N 键强度和 Mn-N4 站点耐用性.
结论:
- 与以前的Mn基催化剂相比,开发的Mn-N-C-S催化剂表现出更高的ORR活性和稳定性.
- 硫是提高基于Mn的ORR催化剂性能的一种有效策略.
- 这种催化剂显示出在燃料电池和金属空气电池中应用的巨大潜力,推动了可持续能源技术的发展.
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