铁集群调节Fe-N4位点的局部电荷分布,以促进氧气电还原
Jirong Bai1, Yiming Tang1, Cheng Lin1
1Research Center of secondary Resources and Environment, School of Chemical Engineering and Materials, Changzhou Institute of Technology, Changzhou, 213022, China.
Journal of colloid and interface science
|June 11, 2023
概括
原子分散的铁--碳催化剂显示出替代贵金属的前景. 引入铁纳米集群优化了电子结构,显著提高了氧降解反应活性.
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:
- 原子分散铁协调 (FeNC) 催化剂是贵金属电催化剂的潜在非贵金属替代品.
- 在FeNC催化剂中,对称的电荷分布往往限制了它们的活动.
- 氧降解反应 (ORR) 对能量转换技术至关重要.
研究的目的:
- 通过调节其电子结构来增强原子分散FeNC催化剂的活性.
- 研究引入同类金属集群和增加含量对催化剂性能的影响.
主要方法:
- 在N-doped多孔碳 (FeNCs/FeSAs-NC-Z8@34) 上制造原子分散的Fe-N4和Fe纳米集群.
- 电化学评估催化剂的氧降解反应 (ORR) 活性.
- 理论计算 (例如,DFT) 以了解电子结构和反应机制.
主要成果:
- 制造的FeNCs/FeSAs-NC-Z8@34催化剂实现了0.918V的高半波潜力,超过了商业Pt/C.
- 理论计算证实,Fe纳米集团打破了Fe-N4位点的对称电子结构.
- 优化的电子结构促进了电荷再分配,并加速了ORR中决定速度的OO键断裂.
结论:
- 引入Fe纳米集群有效调节单原子站点的电子结构.
- 开发的催化剂显著改善了氧降解反应活性.
- 这种方法提供了一个可行的策略,用于优化单原子催化剂性能,用于能源应用.
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