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Self-supported Ni/NiO heterostructures with a controlled reduction protocol for enhanced industrial alkaline hydrogen
Haiyang Wang1, Cong Chen1, Junxia Shen1
1School of Physical Science and Technology, Jiangsu Key Laboratory of Frontier Material Physics and Devices, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China. cchen96@suda.edu.cn.
This study presents self-supported nickel/nickel oxide heterostructures for alkaline water electrolysis (AWE). These materials achieve an ultralow voltage of 1.79 V, demonstrating efficient hydrogen production.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Industrial alkaline water electrolysis (AWE) requires efficient and stable electrocatalysts for hydrogen production.
- Existing catalysts often face challenges with voltage efficiency and long-term stability in industrial AWE systems.
Purpose of the Study:
- To develop self-supported Ni/NiO heterostructures with controllable ratios for enhanced performance in industrial AWE.
- To investigate the relationship between material composition and electrocatalytic activity for hydrogen evolution reaction (HER).
Main Methods:
- Fabrication of self-supported Ni/NiO heterostructures with varying Ni:NiO ratios.
- Electrochemical characterization of the heterostructures in alkaline media.
- Long-term stability testing under industrial alkaline water electrolysis conditions.
Main Results:
- Achieved an ultralow cell voltage of 1.79 V at a high current density of 400 mA cm⁻².
- Demonstrated excellent stability over a 2-week testing period in industrial alkaline water electrolysis.
- The performance is attributed to the synergistic effects of abundant active sites, rapid electron/mass transfer, and optimized HER kinetics.
Conclusions:
- Self-supported Ni/NiO heterostructures are highly effective electrocatalysts for industrial alkaline water electrolysis.
- Controllable ratios in Ni/NiO heterostructures enable optimization of catalytic performance and stability.
- This advancement offers a promising pathway for efficient and cost-effective hydrogen generation via AWE.
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