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An efficient bifunctional electrocatalyst for water splitting based on cobalt phosphide.

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Cobalt phosphide nanowire arrays on titanium mesh act as efficient bifunctional electrocatalysts for water splitting. This material shows promising performance for both hydrogen and oxygen evolution reactions in alkaline conditions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Efficient electrocatalysts are crucial for water splitting, a key technology for renewable energy storage.
  • Developing bifunctional catalysts that facilitate both hydrogen and oxygen evolution reactions is a significant challenge.

Purpose of the Study:

  • To demonstrate a novel cobalt phosphide nanowire array on a titanium mesh (CoP/TM) as a bifunctional electrocatalyst.
  • To evaluate the electrocatalytic activity of CoP/TM for water splitting in an alkaline medium.

Main Methods:

  • Fabrication of cobalt phosphide nanowire arrays on a titanium mesh substrate.
  • Electrochemical characterization using techniques like linear sweep voltammetry in 1.0 M KOH.
  • Testing the performance in a two-electrode alkaline electrolyzer setup.

Main Results:

  • The CoP/TM electrode achieved a current density of 10 mA cm(-2) with low overpotentials for both hydrogen evolution reaction (HER) at 72 mV and oxygen evolution reaction (OER) at 310 mV.
  • The integrated two-electrode electrolyzer using CoP/TM reached 10 mA cm(-2) at a cell voltage of 1.64 V.

Conclusions:

  • Cobalt phosphide nanowire arrays on titanium mesh are effective bifunctional electrocatalysts for overall water splitting.
  • The demonstrated CoP/TM catalyst offers a promising pathway for efficient and cost-effective hydrogen production via water electrolysis.