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Related Experiment Video

Updated: May 23, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods

Published on: February 11, 2016

Finding hydrogen-storage capability in iridium induced by the nanosize effect.

Hirokazu Kobayashi1, Miho Yamauchi, Hiroshi Kitagawa

  • 1Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan. hkobayashi@icems.kyoto-u.ac.jp

Journal of the American Chemical Society
|April 10, 2012
PubMed
Summary

Nanosize iridium (Ir) nanoparticles exhibit hydrogen storage capabilities, a property absent in bulk iridium. This breakthrough was confirmed using advanced spectroscopic and pressure-composition isotherm techniques.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Bulk iridium (Ir) is known for its inertness and does not typically absorb hydrogen.
  • Hydrogen storage is a critical area for energy applications, including fuel cells and batteries.
  • Nanomaterials often exhibit unique properties distinct from their bulk counterparts.

Purpose of the Study:

  • To investigate the potential for hydrogen storage in iridium nanoparticles.
  • To characterize the size and properties of iridium nanoparticles.
  • To confirm hydrogen absorption in nanosize iridium.

Main Methods:

  • Transmission electron microscopy (TEM) was used to determine the mean diameter of iridium nanoparticles.
  • Solid-state deuterium (2H) Nuclear Magnetic Resonance (NMR) spectroscopy was employed to detect hydrogen storage.

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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Last Updated: May 23, 2026

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Published on: February 11, 2016

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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

  • Hydrogen pressure-composition isotherm measurements were conducted to quantify hydrogen uptake.

    • Main Results:

    • Iridium nanoparticles with a mean diameter of 1.5 ± 0.5 nm were successfully synthesized.
    • Nanosize iridium demonstrated significant hydrogen storage capacity, unlike bulk iridium.
    • Solid-state (2)H NMR and isotherm measurements confirmed the hydrogen absorption in the nanoparticles.

    Conclusions:

    • The study demonstrates that reducing iridium to the nanoscale induces hydrogen storage capabilities.
    • Nanosize iridium is a potential candidate material for hydrogen storage applications.
    • This finding opens new avenues for exploring hydrogen storage in other non-absorbent bulk metals through nanosizing.