在基于铁的双金属表面上直接去氧化,使用飞行中的替代模型
Isaac Onyango1,2, Qiang Zhu1,2
1Department of Mechanical Engineering and Engineering Science, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.
The journal of physical chemistry. C, Nanomaterials and interfaces
|October 29, 2025
概括
我们开发了一种更快的计算方法,用于研究铁基催化剂上的直接脱氧 (DDO). 地下和提高了催化性能,而顶层的添加物阻碍了脱氧过程.
科学领域:
- 表面科学是一门科学.
- 计算化学是一种计算化学.
- 催化剂是一种催化剂.
背景情况:
- 直接脱氧 (DDO) 对于去除含氧化合物至关重要.
- 为DDO开发高效的催化剂需要了解金属表面的反应机制.
- 计算方法对于探索复杂的表面反应至关重要.
研究的目的:
- 研究在基于Fe的双金属表面上的直接脱氧 (DDO) 机制.
- 为了评估表面反应研究的新高斯过程回归 (GPR) 加速计算器的性能.
- 为设计有效的双金属催化剂提供洞察力,用于选择性去氧化.
主要方法:
- 使用高斯过程回归 (GPR) 计算器进行加速推推弹性带 (NEB) 计算.
- 对纯Fe{110) 和用Co和Ni修饰的表面 (表面和地下) 进行DDO的系统检查.
- 将GPR-NEB准确度和速度与传统密度函数理论 (DFT) 计算进行比较.
主要成果:
- GPR计算器实现了高达3倍的加速度,能量屏障误差低于0.015 eV.
- 地表Co和Ni的替代维持了DDO的有利热力学和动力学.
- 顶层的Co和Ni替代增加了C-O键裂变障碍,使反应不利.
结论:
- 用GPR加速的过渡状态搜索对于复杂的表面反应是有效的.
- 用Co和Ni进行地表合金显示出增强DDO的Fe基催化剂的前景.
- 在这些基于Fe的表面上,顶层合金对DDO工艺有害.
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