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Updated: Feb 23, 2026
10:18
Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
Published on: February 21, 2017
8.9K
Redefining catalyst reconstruction and Cl--repulsion correlation to delineate a dynamic protective skeleton for
Yang Yu1, Wei Zhou2, Junshu Yuan1
1School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, PR China.
Nature Communications
|February 21, 2026
Summary
Researchers identified how NiFeS anodes selectively repel chloride ions, not hydroxide ions, during seawater electrolysis. This breakthrough enhances green hydrogen production by preventing anode corrosion and improving energy efficiency.
Area of Science:
- Electrochemistry
- Materials Science
- Sustainable Energy
Background:
- Seawater electrolysis for green hydrogen is hindered by chloride oxidation and anode corrosion.
- Existing protective mechanisms lack a clear understanding of anion selectivity.
Purpose of the Study:
- To elucidate the origin of selectivity in NiFeS anodes, specifically why they exclude chloride (Cl-) but not hydroxide (OH-).
- To redefine the link between surface reconstruction and interfacial protection in NiFeS anodes.
Main Methods:
- In-situ Raman spectroscopy
- In-situ X-ray absorption spectroscopy
- Molecular dynamic calculations
Main Results:
- Reconstructed sulfate (SO42-) forms a hydrogen-bond network that weakens chloride's interaction with water.
- This network enhances discrimination between OH- and Cl-, preventing chloride oxidation.
- NiFeS anodes show energy-saving performance (261.8 mV @ 100 mA·cm-2) and long-term durability (2000 h @ 1.0 A·cm-2).
Conclusions:
- The study clarifies the selectivity mechanism in NiFeS anodes for seawater electrolysis.
- NiFeS enables efficient and stable green hydrogen production from seawater.
- The material shows promise for industrial-scale electrolysis applications.
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