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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
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IrO2-Decorated Titania Nanotubes as Oxygen Evolution Anodes.

Aikaterini Touni1, Effrosyni Mitrousi1, Patricia Carvalho2

  • 1Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

Molecules (Basel, Switzerland)
|July 30, 2025
PubMed
Summary

Researchers developed advanced iridium oxide (IrO2) catalysts on black titania nanotubes (bTNTs) for the oxygen evolution reaction (OER). These catalysts, especially on open-structure bTNTs, show superior performance and stability in acidic conditions.

Keywords:
acid water electrolysisblack titanium dioxidedimensionally stable anodesgalvanic replacementiridium oxidetitanium dioxide nanotubes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Titania nanotubes (TNTs) and their reduced black analogues (bTNTs) are explored as catalyst supports.
  • Metallic conductivity in bTNTs is achieved via solid-state reaction with CaH2.
  • Oxygen evolution reaction (OER) is a critical process in various electrochemical applications.

Purpose of the Study:

  • To investigate the electrocatalytic activity of iridium oxide (IrO2) supported on TNTs and bTNTs for OER.
  • To evaluate the effect of nanotube structure (close-packed vs. open) on catalyst performance.
  • To compare the performance of novel catalysts with existing literature benchmarks.

Main Methods:

  • Preparation of TNTs and bTNTs with varying structural properties (close-packed vs. open).
  • Deposition of iridium (Ir) via galvanic replacement of nickel, followed by anodization to IrO2.
  • Electrocatalytic testing for OER, including overpotential, current density, and mass-specific current density measurements.

Main Results:

  • Open-structure bTNTs supported IrO2 catalysts exhibit superior OER activity compared to close-packed structures and plain TNTs.
  • IrO2 nanoparticles on open-structure bTNTs showed improved distribution and smaller particle sizes.
  • The optimized catalyst achieved an overpotential of 240 mV at 10 mA cm-2 and demonstrated 72-hour stability in acidic media.

Conclusions:

  • Open-structure bTNTs are highly effective supports for IrO2 catalysts in OER.
  • The developed IrO2/open-bTNTs electrode offers competitive or superior performance to existing OER catalysts.
  • The catalyst exhibits promising medium-term stability for applications in acidic environments.