Application of an iridium complex for detecting hydrogen permeation through pure iron

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9 Citations (Scopus)


Hydrogen embrittlement of high strength steel is seriously concerned and hydrogen visualization techniques in metals are strongly required to investigate the mechanism of hydrogen embrittlement. In this study, an in situ technique for hydrogen visualization in metals using aqua(2,2′-bipyridine-6,6′-dionato)(pentamethylcyclopentadienyl)iridium(III) (hereafter, Ir complex) has been developed. Hydrogen permeated through palladium-plated iron reacted with the Ir complex leading to the color change of the Ir complex. Furthermore, the flux of hydrogen could be quantitatively obtained from the changes in the RGB color values of the Ir complex. These results indicate that the Ir complex can be used for in-situ hydrogen visualization in metals.

Original languageEnglish
Pages (from-to)25580-25586
Number of pages7
JournalInternational Journal of Hydrogen Energy
Issue number46
Publication statusPublished - 2020 Sep 21


  • Hydrogen
  • In situ observation
  • Iridium complex
  • Pure iron

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology


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