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In-Situ Formation of High-Performance β-NiOOH OER Electrocatalysts Using Boron and Phosphorus-Enriched Ni Core-Shell

Patrick Guggenberger1,2, Prathamesh Patil3,4, Bernhard Fickl5

  • 1Department of Functional Materials and Catalysis, Faculty of Chemistry, University of Vienna, Währinger Straße 42, 1090 Vienna, Austria.

ACS Applied Materials & Interfaces
|May 16, 2025
PubMed
Summary

Researchers developed new nickel-boron-phosphorus (Ni-B-P) electrocatalysts for clean energy production. These core-shell nanoparticles exhibit enhanced activity for the oxygen evolution reaction (OER) through in situ activation.

Keywords:
core−shell nanoparticleselectrochemical activationnickel-based electrocatalystsoxygen evolution reaction (OER)water electrolysis

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Sustainable Energy

Background:

  • Electrocatalytic water splitting is crucial for clean energy, aligning with UN SDG 7.
  • Existing nickel-boron-phosphorus (Ni-B-P) catalysts have limitations in active surface area and elemental concentration.
  • Improved electrocatalysts are needed for efficient oxygen evolution reaction (OER).

Purpose of the Study:

  • To develop tailored Ni-B-P electrocatalysts with enhanced activity and conductivity.
  • To investigate the effect of annealing temperature on catalyst surface chemistry and performance.
  • To understand the in situ activation mechanism for the oxygen evolution reaction.

Main Methods:

  • Facile and scalable chemical reduction synthesis of Ni-B-P core-shell nanoparticles.
  • Surface characterization using X-ray photoelectron spectroscopy (XPS) and low-energy ion scattering (LEIS).
  • Electrochemical evaluation via cyclic voltammetry (CV) and operando electrochemical impedance spectroscopy (EIS).

Main Results:

  • Core-shell Ni-B-P nanoparticles with a porous borate-phosphate shell and metallic core were successfully synthesized.
  • Annealing temperature significantly influenced surface chemistry and OER activity.
  • Leaching of P and B during operation promoted the formation of highly active β-NiOOH species, boosting OER performance.

Conclusions:

  • The developed Ni-B-P electrocatalysts demonstrate excellent OER activity due to in situ activation.
  • The synthesis method is facile, scalable, and offers tailored mesoporous structures.
  • This work provides insights for designing next-generation in situ-activated electrocatalysts for water splitting.