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Lan Y, Tang R, Ye R, Su M, Lei Q, Li F, Tian X, Song J, Zhou L. Unraveling CO adsorption behaviors and its poisoning effects on ZrCo surface. Phys Chem Chem Phys 2024; 26:9617-9627. [PMID: 38466129 DOI: 10.1039/d3cp06251a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Theoretical calculations are performed to elucidate the adsorption behaviors and poisoning effects of CO gas on the ZrCo surface, which drastically limits its application in hydrogen isotopic storage. Specifically, the ionic Zr-Co bond on the surface leads to unique CO adsorption structures on different sites. The CO molecule tends to prefer a tilted adsorption configuration on the Co-Co bridge site. The electronic structures, charge distributions, and bonding characteristics are further explored to study the CO adsorption properties, which obey the electron density donation and back-donation mechanism. For different CO coverages, the stepwise adsorption energies of CO increase with the increasing of coverage, reaching the saturated coverage at nCO = 11. Then, the effects of temperature and partial pressure on CO coverage are evaluated using atomic thermodynamics. The computed phase diagram shows that the ZrCo(110) surface has a stable coverage of nCO = 6 at ambient temperature under ultrahigh vacuum conditions. The pre-adsorbed CO molecules lead to the charge redistribution and the d-band center downshift on the surface, which significantly affect hydrogen adsorption and dissociation. Our results provide insights into the poisoning mechanisms of the impurity gas on ZrCo alloys, which can be beneficial for designing high-performance ZrCo-based alloys with improved poisoning tolerance.
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Affiliation(s)
- Yuejing Lan
- College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China.
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Ru Tang
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Rongxing Ye
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Minan Su
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Qianghua Lei
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Fei Li
- College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China.
| | - Xiaofeng Tian
- College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu, 610059, China.
| | - Jiangfeng Song
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
| | - Linsen Zhou
- Institute of Materials, China Academy of Engineering Physics, Mianyang, 621907, China.
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Effect of Ti/Zr doping on the adsorption, dissociation and diffusion of hydrogen on VFe (110) surface. Chem Phys 2023. [DOI: 10.1016/j.chemphys.2023.111836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Mao GC, Kan XT, Xiao MX, Liu WL, Dong BX, Teng YL. Alkaline Earth Metal-Induced Hydrogenation of the CaO-Captured CO 2 to Methane at Room Temperature. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.2c01479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guo-Cui Mao
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Xiao-Tian Kan
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Ming-Xiu Xiao
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Wen-Long Liu
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Bao-Xia Dong
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
| | - Yun-Lei Teng
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, P. R. China
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Mebtouche F, Zergoug T, Abaidia SEH, Bertsch J, Seddik Kebaili A, Nedjar A. The effect of (Si, Cr, Fe, Ni, Nb, Sn) and monovacancy on hydrogen incorporation into Zr (0001): Ab initio insights. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112781] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Wang Q, Kong X, Yu Y, Han H, Sang G, Zhang G, Yi Y, Gao T. Effect of doping Ti on the vacancy trapping mechanism for helium in ZrCo from first principles. Phys Chem Chem Phys 2019; 21:20909-20918. [PMID: 31517356 DOI: 10.1039/c9cp04502c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interactions of dopants with point defects such as that between vacancies and helium can affect helium evolution and ultimately the macroscopic properties of materials. Herein, the microscopic vacancy trapping mechanism for He defects and the formation of small HemVacn (consisting of m He atoms and n vacancies) clusters in pure and Ti-doped ZrCo systems are investigated by carrying out an extensive set of first-principles calculations based on density functional theory. Our results uncover the following: the helium atom can segregate from the adjacent interstitial (tetrahedral and octahedral) sites towards the vacancy center spontaneously, and therefore, a single He atom is energetically favorable to occupy a vacancy whether in the pure or in the doped system. The dopant Ti can act as a trapping center for He impurities similar to a vacancy. Moreover, it can improve the trapping ability and increase the trapping radius of the vacancies for helium. As for the effect of the Ti atom on the trapping of multiple helium atoms by the vacancy, the higher barrier in the doped systems than in the pure one implies that doping inhibits the formation of large HemVac clusters. Furthermore, in order to evaluate the effect of dopant Ti on the stability of He atoms in multiple vacancies, the binding energies of a helium atom, a vacancy (Vac), and a self-interstitial atom (SIA) to a helium-vacancy cluster (HemVacn) were obtained and compared with that of the pure system. The results suggest that the cluster growth can be inhibited by the dopant Ti, and therefore, the formation of large helium bubbles is also hindered. All the binding energies do not depend much on the cluster size but primarily on the helium-to-vacancy ratio (m/n) of the clusters. The stability of the clusters is decided by the competitive processes among the emission of He atoms, vacancies, and SIAs, and also depends on the helium-to-vacancy ratio. The present results provide an in-depth explanation for the effect of the dopant on helium behavior and could aid future tritium storage material design.
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Affiliation(s)
- Qingqing Wang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610064, China.
| | - Xianggang Kong
- College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
| | - You Yu
- College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China
| | - Huilei Han
- College of Mathematics, Sichuan University, Chengdu, 610064, China
| | - Ge Sang
- Science and Technology on Surface Physics and Chemistry Laboratory, P. O. Box 9071-35, Jiangyou 621907, China.
| | - Guanghui Zhang
- Science and Technology on Surface Physics and Chemistry Laboratory, P. O. Box 9071-35, Jiangyou 621907, China.
| | - Yougen Yi
- Hunan Key Laboratory for Super-Microstructure and Ultrafast Process, College of Physics and Electronics, Central South University, Changsha 410083, China
| | - Tao Gao
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610064, China.
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