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Constructing interface engineering and tailoring a nanoflower-like FeP/CoP heterostructure for enhanced oxygen

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Researchers developed a cost-effective cobalt-iron phosphide catalyst for efficient oxygen evolution reaction (OER) in water splitting. This advanced electrocatalyst offers a promising solution to the energy crisis.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Developing efficient electrocatalysts is crucial for water splitting electrolysis to address the energy crisis.
  • Oxygen evolution reaction (OER) is a key bottleneck in water splitting, requiring low-cost and highly active catalysts.

Purpose of the Study:

  • To synthesize a high-yield, structurally regulated bimetallic cobalt-iron phosphide electrocatalyst for efficient OER.
  • To investigate the effect of nanoscale morphology on OER performance.

Main Methods:

  • A facile one-pot hydrothermal reaction followed by low-temperature phosphating treatment.
  • Tailoring nanoscale morphology by adjusting input ratios and phosphating temperatures.
  • Characterization of the optimized FeP/CoP-1-350 sample with ultra-thin nanosheets assembled into a nanoflower-like structure.

Main Results:

  • The optimized FeP/CoP-1-350 heterostructure exhibited remarkable OER activity.
  • Achieved a low overpotential of 276 mV at 10 mA cm⁻² and a low Tafel slope of 37.71 mV dec⁻¹.
  • Demonstrated long-lasting durability and stability during the OER process.

Conclusions:

  • The enhanced OER activity is attributed to abundant active sites, the CoP/FeP interface, and synergistic Fe-Co effects.
  • This study presents a viable strategy for fabricating efficient and cost-effective bimetallic phosphide electrocatalysts.
  • The developed catalyst shows significant potential for practical applications in water splitting electrolysis.