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Seawater Splitting Using NiFeP-Embedded Porous Carbon Fibers.

Akshara Paras Parekh1, Ashish Kumar Yadav2, Brendan Whitfield1

  • 1Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24061, United States.

ACS Applied Engineering Materials
|December 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed novel nickel-iron-phosphide (NiFeP) electrocatalysts within porous carbon nanofibers for efficient seawater splitting. These durable catalysts show promising performance for oxygen evolution and hydrogen evolution reactions, crucial for clean energy.

Keywords:
electrocatalystselectrospinninghydrogen evolution reactionoxygen evolution reactiontransition metal phosphideswater/seawater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Efficient electrocatalysts are vital for clean energy conversion via water splitting.
  • Non-precious metal catalysts are sought after for cost-effectiveness.
  • Understanding the activity of NiFeP electrocatalysts, especially for oxygen evolution reaction (OER), is crucial.

Purpose of the Study:

  • To synthesize and characterize bimetallic NiFeP encapsulated in porous carbon nanofibers (PCFs).
  • To investigate the electrocatalytic performance of NiFeP-PCFs for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in various electrolytes, including seawater.
  • To understand the synergistic effects contributing to the enhanced catalytic activity.

Main Methods:

  • Utilized a flexible and controllable electrospinning technique to synthesize NiFeP-PCFs.
  • Evaluated electrocatalytic performance through overpotential measurements at specific current densities (100 mA cm⁻²).
  • Assessed durability by prolonged operation at 100 mA cm⁻² and stability during seawater splitting.

Main Results:

  • NiFeP-PCFs demonstrated improved OER and HER performance across alkaline, neutral, and alkaline seawater electrolytes.
  • Achieved low overpotentials: 320 mV for OER and 145 mV for HER in 1 M KOH at 100 mA cm⁻².
  • Showcased excellent durability (100 h at 100 mA cm⁻²) and stable seawater splitting (1.8 V at 100 mA cm⁻² for over 200 h).

Conclusions:

  • The synergistic effects of mesoporous structures and optimized binary metal components in NiFeP-PCFs enhance electrocatalytic activity.
  • NiFeP-PCFs are highly efficient and durable electrocatalysts for both water and seawater splitting.
  • This research paves the way for developing advanced non-noble metal bimetallic electrodes for electrolysis applications.