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Updated: May 20, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Published on: April 27, 2018

Phase-engineered metal boride nanobeads for highly efficient oxygen evolution.

Meijia Liu1, Lin Wu1, Yafeng Li1

  • 1Key Laboratory of Energy Materials and Electrochemistry Research Liaoning Province, School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, China.

Journal of Colloid and Interface Science
|March 27, 2025
PubMed
Summary

Amorphous cobalt boride (CoB) nanoparticles show excellent oxygen evolution reaction (OER) performance. Electrochemical activation unveils bulk active sites, enhancing OER catalysis and stability in water oxidation.

Keywords:
AmorphousControlled phaseMagnetic field-assistedNanobead structureSelf-reconstruction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Non-precious metal catalysts with tailored phase structures are promising for oxygen evolution reaction (OER).
  • Understanding the mechanisms of phase structure enhancement in OER catalysis is crucial.
  • Amorphous materials offer unique properties due to their short-range order.

Purpose of the Study:

  • To synthesize and characterize amorphous cobalt boride (CoB) as an OER catalyst.
  • To investigate the role of amorphous vs. crystalline phases in OER performance.
  • To elucidate the mechanism of catalyst activation and performance enhancement.

Main Methods:

  • Magnetic field-assisted synthesis of amorphous CoB nanoparticles.
  • Heat treatment to induce phase transition from amorphous to crystalline.
  • Electrochemical characterization (OER activity, stability testing).
  • In situ Raman spectroscopy for mechanistic studies.

Main Results:

  • Amorphous CoB nanoparticles self-assembled into a nanobead structure.
  • The catalyst exhibited excellent OER activity (350 mV overpotential at 10 mA cm⁻²) and stability (100 h).
  • Electrochemical activation revealed bulk active sites in the amorphous structure.
  • In situ Raman spectroscopy showed rapid self-reconstruction to an active metal (oxy)hydroxide layer.

Conclusions:

  • Amorphous CoB is a highly efficient and durable catalyst for the oxygen evolution reaction.
  • Electrochemical activation significantly enhances OER performance by leveraging amorphous structure properties.
  • This work provides insights into designing advanced OER catalysts based on amorphous materials.