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Related Experiment Video

Updated: Jun 15, 2025

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
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Enriched Oxygen Coverage Localized within Ir Atomic Grids for Enhanced Oxygen Evolution Electrocatalysis.

Hao Yang Lin1, Qian Qian Yang1, Miao Yu Lin1

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai, 200237, China.

Advanced Materials (Deerfield Beach, Fla.)
|August 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel atomic grid catalyst for oxygen evolution reaction (OER) in proton exchange membrane (PEM) water electrolysis, significantly boosting energy efficiency and stability.

Keywords:
Ir atomic gridsoxygen coverageoxygen evolution reactionreactive support

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Inefficient active site utilization in oxygen evolution reaction (OER) catalysts limits proton exchange membrane (PEM) water electrolysis energy efficiency.
  • Developing advanced catalysts is crucial for improving water splitting performance.

Purpose of the Study:

  • To design and demonstrate a high-density iridium (Ir) atomic grid catalyst on a manganese dioxide (MnO2-x) support.
  • To enhance OER kinetics and energy efficiency in PEM water electrolysis through metal-support cooperation.

Main Methods:

  • Fabrication of an atomic grid structure with high-density Ir sites on a reactive MnO2-x support.
  • Experimental characterization to elucidate the role of MnO2-x in mediating oxygen coverage.
  • Electrochemical testing to evaluate OER performance, including overpotentials and mass activity.

Main Results:

  • The Ir atomic grid on MnO2-x exhibits enhanced oxygen coverage due to low-valent Mn species.
  • Achieved ultra-low overpotentials of 166 mV at 10 mA cm⁻² and 283 mV at 500 mA cm⁻².
  • Demonstrated a mass activity 380 times higher than commercial IrO2 and superior long-term stability in PEM electrolyzers.

Conclusions:

  • The developed metal-support cooperation strategy effectively enhances OER performance.
  • This catalyst design offers a promising pathway for efficient and stable PEM water electrolysis.
  • The findings highlight the importance of atomic-level catalyst design for energy conversion applications.