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Related Experiment Video

Updated: Jul 16, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

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Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution.

Daekyu Kim1, Sumin Park2, Juhyung Choi3

  • 1Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR.

Small (Weinheim an Der Bergstrasse, Germany)
|September 19, 2023
PubMed
Summary

Ruthenium doping in NiFe2O4/NiMoO4 electrocatalysts promotes dynamic surface reconstruction, creating highly active NiFeOOH/NiOOH. This optimized catalyst shows excellent performance in the oxygen evolution reaction.

Keywords:
electronic structure modulationheterostructuresoxygen evolution reactionruthenium dopingsurface reconstruction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Dynamic surface reconstruction is key to enhancing electrocatalyst activity.
  • Limited research exists on reconstruction's impact on intrinsic catalyst properties.

Purpose of the Study:

  • Investigate Ru doping's effect on NiFe2O4/NiMoO4 surface reconstruction.
  • Understand how reconstruction influences electrocatalyst performance for the oxygen evolution reaction.

Main Methods:

  • Electrochemical characterization
  • Material characterization
  • Density functional theory (DFT) calculations

Main Results:

  • Ru doping induced high-valence Ni (Ni3.6+δ) and surface reconstruction to NiFeOOH/NiOOH.
  • Optimized catalyst achieved a low overpotential (229 mV at 10 mA cm-2) for oxygen evolution.
  • DFT calculations revealed Ru doping optimizes electronic structure and intermediate adsorption.

Conclusions:

  • Surface reconstruction is a viable strategy for designing active electrocatalysts.
  • Ru-doped NiFeOOH/NiOOH demonstrates significant potential for oxygen evolution reactions.