Static and dynamic evolution of CO adsorption on γ-U (1 0 0) surface with different levels of Mo doping using DFT and AIMD calculations

Jun-Wei Li; Wei-Min Jia; Chong Liu; Sha-Sha Lv; Jin-Tao Wang; Zheng-Cao Li

doi:10.1007/s41365-023-01287-z

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Static and dynamic evolution of CO adsorption on γ-U (1 0 0) surface with different levels of Mo doping using DFT and AIMD calculations

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2023-10-13

- Static and dynamic evolution of CO adsorption on γ-U (1 0 0) surface with different levels of Mo doping using DFT and AIMD calculations
- Nuclear Science and Techniques Vol. 34, Issue 9, Article number: 143(2023)
- Affiliations：
  
  1.Key Lab of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  2.Xi’an Research Institute of High-Technology, Xi’an 710025, China
  3.Key Laboratory of Beam Technology (MOE), College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
- Author bio：
  
  zcli@tsinghua.edu.cn
- Funds：
- DOI：10.1007/s41365-023-01287-z
  CLC：
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Jun-Wei Li, Wei-Min Jia, Chong Liu, et al. Static and dynamic evolution of CO adsorption on γ-U (1 0 0) surface with different levels of Mo doping using DFT and AIMD calculations. [J]. Nuclear Science and Techniques 34(9):143(2023)
DOI：

Jun-Wei Li, Wei-Min Jia, Chong Liu, et al. Static and dynamic evolution of CO adsorption on γ-U (1 0 0) surface with different levels of Mo doping using DFT and AIMD calculations. [J]. Nuclear Science and Techniques 34(9):143(2023) DOI： 10.1007/s41365-023-01287-z.

摘要

Abstract

Alloys of uranium and molybdenum are considered as the future of nuclear fuel and defense materials. However, surface corrosion is a fundamental problem in practical applications and storage. In this study, the static and dynamic evolution of carbon monoxide (CO) adsorption and dissociation on γ-U (1 0 0) surface with different Mo doping levels was investigated based on density functional theory and ,ab initio, molecular dynamics. During the static calculation phase, parameters, such as adsorption energy, configuration, and Bader charge, were evaluated at all adsorption sites. Furthermore, the time-dependent behavior of CO molecule adsorption were investigated at the most favorable sites. The minimum energy paths for CO molecular dissociation and atom migration were investigated using the transition state search method. The results demonstrated that the CO on the uranium surface mainly manifests as chemical adsorption before dissociation of the CO molecule. The CO molecule exhibited a tendency to rotate and tilt upright adsorption. However, it is difficult for CO adsorption on the surface in one of the configurations with CO molecule in vertical direction but oxygen (O) is closer to the surface. Bader charge illustrates that the charge transfers from slab atoms to the 2π* antibonding orbital of CO molecule and particularly occurs in carbon (C) atoms. The time is less than 100 fs for the adsorptions that forms embryos with tilt upright in dynamics evolution. The density of states elucidates that the overlapping hybridization of C and O 2,p, orbitals is mainly formed via the ,d, orbitals of uranium and molybdenum (Mo) atoms in the dissociation and re-adsorption of CO molecule. In conclusion, Mo-doping of the surface can decelerate the adsorption and dissociation of CO molecules. A Mo-doped surface, created through ion injection, enhanced the resistance to uranium-induced surface corrosion.

关键词

Keywords

Adsorption and dissociationUraniumCO moleculeDensity functional theoryab-initio molecular dynamics

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