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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Iridium Oxide Shell Structure on Rutile Titanium Oxide for Efficient Supported Catalyst for the Oxygen Evolution

Elena Cazzulani1,2,3, Camille Roiron1,4, Lindsay Zhang1,4

  • 1Department of Chemical and Biomolecular Engineering, University of California, Irvine, CA, 92697, USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 27, 2025
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Summary
This summary is machine-generated.

Developing novel iridium oxide (IrO₂) catalysts on rutile titanium dioxide (TiO₂) spheres enhances hydrogen production efficiency in proton exchange membrane water electrolysis. This core-shell structure minimizes precious metal use and improves catalyst performance for large-scale applications.

Keywords:
catalystcore‐shell structureiridium loadingoxygen evolution reactionsupported iridium oxide

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton exchange membrane water electrolysis is key for green hydrogen production.
  • High iridium oxide loading limits cost-effectiveness and scalability.
  • Developing supported catalysts can reduce precious metal dependence.

Purpose of the Study:

  • To synthesize and characterize novel core-shell iridium oxide catalysts on rutile titanium dioxide supports.
  • To investigate the impact of structural compatibility on catalyst performance.
  • To evaluate the electrochemical activity for water electrolysis.

Main Methods:

  • Synthesis of IrO₂ on rutile TiO₂ spheres to create a core-shell structure.
  • Characterization using imaging, diffraction, and spectroscopy.
  • Electrochemical evaluation of catalytic performance.

Main Results:

  • A continuous IrO₂ shell formed on rutile TiO₂ due to structural compatibility.
  • Core-shell catalysts exhibited superior mass activity and pseudo-capacitance compared to decorated structures on anatase TiO₂.
  • Performance was comparable to commercial unsupported iridium oxide catalysts.

Conclusions:

  • The rutile IrO₂-rutile TiO₂ interaction significantly improves catalyst utilization.
  • Core-shell structures are promising for low-loading electrolysis systems.
  • This approach offers a pathway to reduce cost and reliance on precious metals in hydrogen production.