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Electrodeposition

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...

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Dual-function surface engineering for enhancing anode stability in alkaline seawater oxidation.

Yuchun Ren^1,2, Denian Wang³, Shengjun Sun¹

¹College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, Shandong, China.

Nature Communications

|April 14, 2026

Summary

A novel dual-protection anode using Osmium nanoparticles on Cobalt Phosphide nanowires (Os-CoP/NF) significantly extends the lifespan of electrolyzers for green hydrogen production from seawater. This anode resists corrosion and acid etching, enabling 4500 hours of stable operation.

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Area of Science:

Electrochemistry
Materials Science
Green Chemistry

Background:

Seawater electrolysis is crucial for green hydrogen production.
Chloride ions and acid etching severely limit anode lifespan in seawater electrolysis.
Developing durable anodes for seawater oxidation is a critical challenge.

Purpose of the Study:

To design a dual-protection anode that inhibits corrosion during seawater electrolysis.
To enhance the stability and longevity of anodes for green hydrogen production.
To investigate the protective mechanisms of Osmium nanoparticles and Cobalt Phosphide.

Main Methods:

Synthesized Osmium nanoparticles anchored on Cobalt Phosphide nanowires supported by Nickel foam (Os-CoP/NF).
Investigated proton-buffering and chloride-repelling capabilities of the anode.
Performed long-term (4500-hour) ampere-level real seawater electrolysis.
Evaluated anode performance during continuous and intermittent operation.

Main Results:

The Os-CoP/NF anode demonstrated dual-protection against chloride corrosion and acid etching.
Self-released phosphate ions repelled chloride ions and buffered local pH.
Osmium sites bound with chloride ions, inhibiting chlorine chemistry corrosion.
Achieved stable operation for up to 4500 hours in real seawater electrolysis.
The membrane electrode assembly showed a 500-hour lifespan under various operating conditions.

Conclusions:

The Os-CoP/NF anode offers a robust solution for stable and long-lasting seawater electrolysis.
The dual-protection strategy effectively safeguards active sites from corrosion.
This electrode design concept holds significant potential for industrial green hydrogen production.