Detection of hydrogen distribution in pure iron using WO3 thin film

Yu Sugawara, Yuto Sakaizawa, Akihiro Shibata, Izumi Muto, Nobuyoshi Hara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The usefulness of a new approach to detecting the distribution of hydrogen absorbed into pure iron utilizing a WO3 thin film was demonstrated in this study. A WO3 film with an electrochromic property was formed on the hydrogen detection side of iron sheet by reactive magnetron sputtering. After hydrogen was absorbed into the iron sheet by cathodic polarization on the hydrogen absorption side, the color of the WO3 film corresponding to the electrode area changed from light blue to dark blue. The WO3 film was found to reflect the distribution of hydrogen absorbed into the pure iron sheet. No color change occurred on the hydrogen detection side unless a Pd film was inserted between the WO3 film and the iron specimen. The reflectance of the WO3 film in the visible region was reduced by hydrogen charging, with a marked reduction in the RGB color values after the start of hydrogen charging. The results of an XPS analysis suggested that the phase transition from WO3 to HxWO3 resulted in the color change of the WO3 film during hydrogen charging. Because of the simplicity of this approach to detecting hydrogen compared to other hydrogen detection methods, it is expected to have various applications.

Original languageEnglish
Pages (from-to)1860-1867
Number of pages8
JournalIsij International
Issue number10
Publication statusPublished - 2018 Oct


  • Electrochromic reaction
  • Hydrogen detection
  • Hydrogen mapping
  • Pure iron
  • Reactive magnetron sputtering
  • WO3 thin film

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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