Chem. J. Chinese Universities ›› 2024, Vol. 45 ›› Issue (8): 20240186.doi: 10.7503/cjcu20240186

• Physical Chemistry • Previous Articles     Next Articles

Theoretical Study of the Aggregation and Dissociation of Water Molecules on the ZrCo(110) Surface

TANG Ru1,2, DAN Qi1, YE Rongxing2, LAN Yuejing2, WANG Jinchuan2, CHEN Xiaohong1(), SONG Jiangfeng2, ZHOU Linsen2()   

  1. 1.School of Science,Xihua University,Chengdu 610039,China
    2.Institute of Materials,China Academy of Engineering Physics,Mianyang 621907,China
  • Received:2024-04-12 Online:2024-08-10 Published:2024-05-22
  • Contact: CHEN Xiaohong, ZHOU Linsen E-mail:shengxiaohongb@163.com;zhoulinsen173@aliyun.com
  • Supported by:
    the National Natural Science Foundation of China(52371242);the Project of Sichuan Provincial Department of Science and Technology, China(2023YFSY0021)

Abstract:

The oxidation reaction between zirconium cobalt alloy(ZrCo), as a tritium storage material, and gas water molecules usually leads to the poisoning and deactivation of the material surface, which greatly affects the safe operation of fusion reactors. In this article, first-principles calculation methods based on density functional theory(DFT) was employed to study the adsorption and dissociation behavior of various water molecule clusters on the ZrCo(110) surface. The result shows that 6H2O cluster forms a cyclic adsorption configuration on the surface through hydrogen bonding. As the cluster size increases, the adsorption energy of newly added molecule gradually decreases, and water clusters gradually evolve into complex double-layer water molecule adsorption configurations due to surface spatial effects. Moreover, protons can rapidly transfer between different water molecules by the hydrogen bonding in water clusters. On the other hand, water molecules are prone to chemical bond cleavage at the active sites on the ZrCo(110) surface, where the product OH mainly interacts with surface Zr atoms, while the product H adsorbs on Zr2Co threefold hollow sites. Therefore, hydrogen bonding plays a very important role in the oxidation and corrosion behavior of ZrCo(110) surface by water molecules.

Key words: Water cluster, ZrCo alloy, Adsorption and dissociation, First-principles calculation

CLC Number: 

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