Adsorption of H on Cs/W(110): Impact of H on the Stability of Cs on the Surface

• Abraham B. Padama Allan

  Institute of Mathematical Sciences and Physics, College of Arts and Sciences, University of the Philippines Los Baños

• Agerico Diño Wilson

  Department of Applied Physics, Osaka University

• Wada Motoi

  Graduate School of Science and Engineering, Doshisha University

• Tsumori Katsuyoshi

  National Institute for Fusion Science

• Kisaki Masashi

  National Institute for Fusion Science

• Kasai Hideaki

  National Institute of Technology

• Nakanishi Hiroshi

  National Institute of Technology

• Sasao Mamiko

  Organization for Research Initiatives and Development, Doshisha University

• Tanaka Nozomi

  Institute of Laser Engineering, Osaka University

Abstract

We studied the adsorption of H on Cs/W(110) by performing density functional theory (DFT) based total energy calculations to determine the influence of H on Cs stability on the surface. For reference, we also independently examined the adsorption of H and Cs on clean W(110). We found that the adsorption energies of both H and Cs decrease in the presence of the other. H adsorbs more strongly in H/W(110) as compared to the coadsorbed system H/Cs/W(110). We observe the same trend for Cs adsorption in Cs/W(110) and H/Cs/W(110) systems. Due to the greater electronegativity of H as compared to Cs, increasing the H coverage further weakens Cs adsorption on the W surface. The results suggest that the presence of H could lead to the desorption of Cs from the surface and thus, it is necessary to reevaluate the designs of Cs/W systems used in negative hydrogen production applications. [DOI: 10.1380/ejssnt.2018.391]

Journal

• e-Journal of Surface Science and Nanotechnology

  e-Journal of Surface Science and Nanotechnology 16 (0), 391-395, 2018-09-20

  The Japan Society of Vacuum and Surface Science

Keywords

• Cesiated tungsten
• Hydrogen adsorption
• Density functional theory

Details

• CRID: 1390282763049206784
• NII Article ID: 130007485392
• DOI: 10.1380/ejssnt.2018.391
• ISSN: 13480391
• Web Site: https://www.jstage.jst.go.jp/article/ejssnt/16/0/16_391/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed