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Updated: May 6, 2026

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Iridium Single-Atom-Modulated Nickel Hydroxide for Boosting Overall Water Splitting.

Rui Wan1,2, Yuguang Wang1,2, Xiaoxiao Wu1,2

  • 1Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.

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|October 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new bifunctional electrocatalyst made of single iridium atoms on nickel hydroxide nanosheets. This catalyst shows high efficiency and stability for both hydrogen and oxygen evolution reactions in water electrolysis.

Keywords:
bifunctional electrocatalystscocatalysisiridium single atomsoverall water splittingstructurally integrated electrode

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for industrial water electrolysis.
  • Existing catalysts often struggle with activity and stability at high current densities.

Purpose of the Study:

  • To create a facile one-step hydrothermal method for fabricating a novel bifunctional electrocatalyst.
  • To investigate the structural and electronic properties of single iridium atom-modulated nickel hydroxide nanosheets for water electrolysis.

Main Methods:

  • A one-step hydrothermal synthesis strategy was employed to prepare Ir single-atom (SA)-modulated ultrathin nickel hydroxide nanosheets on nickel foam (Ir-Ni(OH)2/NF).
  • Density functional theory (DFT) calculations were used to understand the catalytic mechanisms and electronic structure.
  • Electrochemical performance was evaluated for HER and OER in alkaline media.
  • An anion exchange membrane water electrolysis (AEMWE) cell was assembled using the developed electrode.

Main Results:

  • The Ir-Ni(OH)2/NF electrode exhibited low overpotentials of 23 mV for HER and 217 mV for OER at 10 mA cm-2.
  • The incorporation of Ir atoms modulated the electronic properties of Ni(OH)2, creating oxygen vacancies and optimizing active sites.
  • An AEMWE electrolyzer using Ir-Ni(OH)2/NF achieved an ultrasmall cell voltage of 1.54 V at 500 mA cm-2 with over 225 hours of stability.

Conclusions:

  • The Ir-Ni(OH)2/NF electrode demonstrates excellent bifunctional activity and robust stability for water electrolysis.
  • The study provides a promising pathway for designing advanced bifunctional electrocatalysts through single-atom modulation.
  • This work contributes to the advancement of efficient and durable water splitting technologies.