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Related Experiment Video

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A Universal AgP2 Nanowire Modification Method Enabling Durable Anodes for Alkaline Seawater Electrolysis.

Haocheng Chen1,2, Sixie Zhang2, Yingjie Wen2

  • 1College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.

ACS Applied Materials & Interfaces
|April 13, 2026
PubMed
Summary

Sustainable hydrogen production via alkaline seawater electrolysis is hindered by anode corrosion. This study introduces a novel silver nanowire and phosphating method to create durable anodes, enabling over 1000 hours of stable operation in corrosive electrolytes.

Keywords:
Alkaline seawater electrolysisAnodeCl− corrosion resistanceStabilityUniversal modification method

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Alkaline seawater electrolysis offers a sustainable hydrogen production pathway.
  • High chloride ion concentration in seawater leads to severe anode corrosion, limiting operational stability.

Purpose of the Study:

  • To develop a scalable and universal method for creating corrosion-resistant oxygen-evolution anodes for alkaline seawater electrolysis.
  • To enhance the long-term stability and efficiency of electrodes in highly saline alkaline environments.

Main Methods:

  • Loading silver nanowires onto various anode platforms (Ni mesh, NiFe-LDH/Ni mesh, NiCo-LDH/Ni mesh) followed by phosphating treatment.
  • In situ conversion of silver nanowires to a silver chloride network and phosphate adsorption to form a protective layer.
  • Electrochemical testing in high salinity alkaline electrolytes and performance evaluation in a scaled-up alkaline seawater electrolyzer.

Main Results:

  • The modified anodes, particularly NiFeP@AgP2 NWs, demonstrated remarkable stability, operating over 600 hours in highly saline alkaline electrolyte and over 1000 hours in 1 M NaOH + 0.5 M NaCl.
  • A protective layer formed by a silver chloride network and adsorbed phosphate ions effectively immobilized chloride ions and repelled free chloride, suppressing corrosion.
  • Scaled-up electrodes (approx. 100 cm²) exhibited stable operation in an alkaline seawater electrolyzer with low energy consumption.

Conclusions:

  • The proposed silver nanowire loading and phosphating method provides a robust strategy for fabricating highly corrosion-resistant oxygen-evolution anodes.
  • This advancement significantly improves the durability of electrodes for alkaline seawater electrolysis, paving the way for efficient and sustainable hydrogen production.
  • The developed technology demonstrates practical applicability for large-scale hydrogen generation using seawater as an electrolyte.