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Interface engineering of a CeO2-Cu3P nanoarray for efficient alkaline hydrogen evolution.

Zao Wang1, Huitong Du, Zhiang Liu

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Developing a novel CeO2-Cu3P nanoarray catalyst on nickel foam significantly enhances the alkaline hydrogen evolution reaction (HER). This advanced electrocatalyst demonstrates high activity and durability for efficient green hydrogen production.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient electrocatalysts are crucial for the hydrogen evolution reaction (HER) in alkaline media.
  • Developing cost-effective and highly active catalysts remains a significant challenge.

Purpose of the Study:

  • To design and develop a novel nanoarray electrocatalyst for enhanced HER performance in alkaline conditions.
  • To investigate the catalytic properties and durability of the CeO2-Cu3P/NF hybrid material.

Main Methods:

  • Synthesis of a CeO2-Cu3P nanoarray supported on nickel foam (CeO2-Cu3P/NF).
  • Electrochemical characterization of the catalyst for HER activity and durability.
  • Density functional theory (DFT) calculations to understand the catalytic mechanism.

Main Results:

  • The CeO2-Cu3P/NF catalyst achieved a low overpotential of 148 mV for a current density of 20 mA cm-2 in 1.0 M KOH.
  • The catalyst exhibited excellent long-term stability for over 100 hours with nearly 100% Faradaic efficiency.
  • DFT calculations indicated lower water dissociation energy and a more favorable hydrogen adsorption free energy for the hybrid catalyst.

Conclusions:

  • The CeO2-Cu3P/NF nanoarray is a highly active and durable electrocatalyst for the alkaline hydrogen evolution reaction.
  • The synergistic effects between CeO2 and Cu3P contribute to the improved catalytic performance.
  • This work provides insights into designing efficient electrocatalysts for sustainable hydrogen production.