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Al-Doped CoP nanoarray: a durable water-splitting electrocatalyst with superhigh activity.

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Researchers developed an aluminum-doped cobalt phosphide nanoarray (Al-CoP/CC) as a highly active and durable electrocatalyst for efficient hydrogen fuel production via water splitting. This Earth-abundant catalyst outperforms precious metals in both acidic and alkaline conditions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Efficient electrocatalysts are crucial for scalable hydrogen fuel production via water splitting.
  • Earth-abundant catalysts are needed to reduce costs and improve energy efficiency.

Purpose of the Study:

  • To develop a highly active and durable electrocatalyst for hydrogen evolution reaction (HER).
  • To investigate the performance of aluminum-doped cobalt phosphide nanoarrays (Al-CoP/CC) for water splitting.

Main Methods:

  • Fabrication of Al-CoP/CC electrocatalyst on carbon cloth.
  • Electrochemical testing in acidic (0.5 M H2SO4) and alkaline (1.0 M KOH) electrolytes.
  • Density functional theory (DFT) calculations to understand catalytic mechanisms.

Main Results:

  • Al-CoP/CC exhibited superhigh activity for HER, requiring only 23 mV overpotential for 10 mA cm⁻² current density in acid.
  • The catalyst demonstrated superior bifunctional activity and durability for alkaline water electrolysis.
  • A two-electrode water electrolyzer with Al-CoP/CC achieved 10 mA cm⁻² at 1.56 V in 1.0 M KOH.

Conclusions:

  • Al-CoP/CC is a cost-effective and high-performance electrocatalyst for large-scale hydrogen fuel production.
  • Aluminum doping enhances the catalytic activity by optimizing hydrogen adsorption free energy.
  • This work presents a promising alternative to precious metal catalysts in water-splitting devices.