磁场增强的化合金催化剂用于酸氧演化反应
Lamei Li1, Yue Wang1, Renat R Nazmutdinov2
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China.
Nano letters
|May 10, 2024
概括
磁场增强的- (CoIr) 纳米集群在酸性介质中显著增强氧演化反应 (OER). 这一突破为高效的电催化剂提供了有希望的途径,克服了在恶劣环境中以前的局限性.
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:
- 氧进化反应 (OER) 对于能量转化至关重要,但其动力学较慢,特别是在酸性介质中.
- 现有的磁催化剂在恶劣的酸性OER条件下保持有序的磁域面临挑战.
- 为高效的酸性OER开发强大的催化剂仍然是一个重要的科学障碍.
研究的目的:
- 在酸性环境中设计具有增强活性和稳定性的磁催化剂,用于氧气演化反应.
- 调查诱导局部磁矩和旋转极化在提高OER性能方面的作用.
- 探索添加的 (CoIr) 纳米集群在磁场增强电催化中的潜力.
主要方法:
- 通过将补充剂引入金属催化剂,合成- (CoIr) 纳米集群 (NCs).
- 使用显著的3d-5d杂交来诱导CoIrNCs内部的局部磁矩.
- 使用密度函数理论 (DFT) 计算来分析电子结构和旋转极化.
主要成果:
- CoIr NCs显示显著增强磁场辅助的酸性OER活性,在10 mA cm-2时达到220 mV的低超电位.
- 催化剂表现出了显著的长期稳定性,在恒定磁场下运行120小时,而在没有磁场的情况下运行20小时.
- 随着磁化,旋转频率增加了3.0倍 (在1.5V和RHE时为7.4秒-1),这归因于明显的旋转极化.
结论:
- 通过Ir催化剂中的Co doping诱导的局部磁矩有效地提高了酸性OER的性能.
- CoIr NCs在磁场中表现出卓越的活性和稳定性,克服了酸性介质中的限制.
- 在CoIr NC中明显的旋转偏振被确定为改善OER动力学的关键因素.
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