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Exploring P-(Fe,V)-Codoped Metastable-Phase β-NiMoO4 for Improving the Performance of Overall Water Splitting.

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Developing new nonprecious metal catalysts is key for hydrogen production. This study introduces P-(Fe,V)-codoped β-NiMoO4, achieving efficient oxygen and hydrogen evolution for overall water splitting.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing high-performance, low-cost nonprecious metal catalysts is crucial for large-scale hydrogen production.
  • Designing electrocatalysts with high overall water-splitting activity at the atomic level remains a significant challenge.

Purpose of the Study:

  • To develop novel nonprecious metal electrocatalysts for efficient hydrogen and oxygen evolution.
  • To investigate the role of phosphorus doping in stabilizing metastable phases and enhancing catalytic activity.

Main Methods:

  • Synthesis of P-(Fe,V)-codoped metastable-phase β-NiMoO4.
  • Electrochemical characterization for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) activity.
  • Fabrication and testing of an overall water-splitting cell using the developed catalyst.

Main Results:

  • The P-(Fe,V)-codoped β-NiMoO4 catalyst demonstrated low overpotentials for OER (163 mV) and HER (44 mV) at 10 mA cm⁻².
  • An overall water-splitting cell using this catalyst operated at an ultralow voltage of 1.48 V at 10 mA cm⁻².
  • The catalyst exhibited excellent stability, maintaining performance for over 100 hours.

Conclusions:

  • Phosphorus doping is critical for stabilizing the metastable β-NiMoO4 phase, optimizing electronic structure, and increasing active sites.
  • The synergistic effect of multimetal centers with different redox couples significantly enhances catalytic activity.
  • The developed catalyst shows great promise for efficient and low-cost hydrogen production via overall water splitting.