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A hierarchical NiPOx@NiFe LDH nanoarray for durable seawater oxidation
Yuchun Ren1, Jiayun Song2, Shengjun Sun2
1College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014 Shandong, China; School of Environmental Science and Engineering, Southwest Jiaotong University, Chengdu 611756 Sichuan, China.
Journal of Colloid and Interface Science
|February 21, 2025
Summary
This study introduces a novel catalyst for seawater electrolysis, significantly improving hydrogen production efficiency and durability. The new material demonstrates superior anti-corrosion properties, overcoming limitations of current anode catalysts.
Area of Science:
- Electrochemistry
- Materials Science
- Sustainable Energy
Background:
- Seawater electrolysis is a promising route for hydrogen (H2) production.
- Anode catalyst corrosion by chloride ions limits the efficiency and lifespan of seawater electrolysis.
- Conventional anode catalysts suffer from high energy consumption and degradation.
Purpose of the Study:
- To develop a novel hierarchical catalyst for alkaline seawater oxidation (ASO).
- To enhance the electrochemical performance and anti-corrosion stability of anode catalysts.
- To enable efficient and durable hydrogen production from seawater.
Main Methods:
- Fabrication of a hierarchical Ni phosphate@NiFe layered double hydroxide on Ni foam (NiPOx@NiFe LDH/NF) catalyst.
- Electrochemical experiments, including overpotential measurements and long-term stability tests at industrial current densities.
- In situ characterizations to investigate the catalyst's mechanism and protective properties.
Main Results:
- The NiPOx@NiFe LDH/NF catalyst achieved an industrial current density of 1 A cm-2 with a low overpotential of 352 mV.
- Phosphate ions (PO43-) acted as a protective barrier against chloride corrosion, extending catalyst lifespan to 600 hours (compared to 75 hours for NiFe LDH/NF).
- The honeycomb-like structure facilitated efficient oxygen (O2) bubble release, enhancing electrode stability.
Conclusions:
- The developed NiPOx@NiFe LDH/NF catalyst exhibits excellent electrochemical performance and superior anti-corrosion resistance for ASO.
- This hierarchical structure offers a promising strategy for designing advanced anode electrodes for efficient hydrogen production from seawater.
- The findings provide valuable insights into overcoming chloride-induced degradation in electrocatalysis.
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