当地原子结构描述器和晶体场确定了Ru1-xIrxO2作为氧进化催化剂,统一稳定性和活性
Guang-Qiang Yu1, Meng-Die Wang1, Jun-Zhe Li1
1Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.
The Journal of chemical physics
|December 22, 2025
概括
- (Ru/Ir) 氧化物提供了增强的氧化演化反应 (OER) 性能. 一个关键的Ru-O-Ir配置通过优化电子结构来统一OER活动和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 计算化学计算化学
背景情况:
- 和氧化物是氧化演化反应 (OER) 的关键催化剂.
- 实现最佳性能需要平衡活动和稳定性,这是Ru/Ir氧化物系统中已知的挑战.
- 了解这些混合氧化物中OER的基本机制对于催化剂设计至关重要.
研究的目的:
- 阐明OER的Ru1-xIrxO2催化剂的活性和稳定机制.
- 开发准确和计算高效的方法来预测催化剂性能.
- 确定负责Ru/Ir氧化物增强性能的关键结构特征.
主要方法:
- 利用局部原子结构描述符来预测OER中间吸附和溶解效应.
- 应用了集群扩张 (CE) 方法来确定不同度的基态结构.
- 进行了晶体场分析,以了解电子结构对催化物的贡献.
主要成果:
- 确定了Ru-O-Ir局部配置作为统一OER活动和Ru1-xIrxO2.2稳定的关键因素.
- 证明Ru原子向上移动Ir的dz2带中心,为高活性提供弱*OOH吸附.
- 表明Ir原子降低了Ru的t2g轨道,增强了结构稳定性.
结论:
- 该研究成功地解决了Ru/Ir氧化物OER催化剂的活性稳定性权衡问题.
- 为催化剂开发提供了基于描述符和集群扩展模型的基本见解.
- 强调特定的局部原子配置和电子结构对于高效的OER催化的重要性.
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