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Self-supporting, hierarchically hollow structured NiFe-PBA electrocatalyst for efficient alkaline seawater oxidation
Kaiyan Zhang1, Mingze Xu1, Jianying Wang1
1Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China. wang_jianying@tongji.edu.cn.
Nanoscale
|October 23, 2023
Summary
A new self-supporting nickel-iron Prussian-blue-analogue (NiFe-PBA) electrocatalyst enables efficient and stable hydrogen generation from seawater. This breakthrough advances sustainable energy solutions by improving seawater electrolysis performance.
Area of Science:
- Electrochemistry
- Materials Science
- Sustainable Energy
Background:
- Seawater electrolysis offers a sustainable route for hydrogen production, leveraging abundant ocean resources.
- Challenges in seawater electrolysis include corrosive electrolytes and competing side reactions, demanding advanced electrocatalysts.
- Developing highly efficient and stable electrocatalysts is crucial for practical seawater electrolysis.
Purpose of the Study:
- To introduce a novel self-supporting, hierarchically hollow NiFe-PBA electrocatalyst for oxygen evolution in alkaline seawater.
- To investigate the synergistic effects of Ni and Fe in the NiFe-PBA structure for enhanced performance.
- To demonstrate the potential of PBA-based materials in robust and efficient seawater electrolysis systems.
Main Methods:
- Fabrication of a self-supporting, porous NiFe-PBA electrocatalyst with a hierarchically hollow nanostructure.
- Electrochemical characterization of the NiFe-PBA catalyst in alkaline seawater electrolyte for oxygen evolution reaction (OER).
- Assembly and testing of a two-electrode electrolyzer using NiFe-PBA as the anode and NiMoN as the cathode for overall seawater electrolysis.
Main Results:
- The NiFe-PBA electrocatalyst demonstrated impressive catalytic performance for oxygen evolution in alkaline seawater.
- Synergistic Ni-Fe interactions in NiFe-PBA improved conductivity, stability, and catalytic activity.
- The constructed electrolyzer achieved a high current density (500 mA cm⁻²) at a low cell voltage (1.782 V) with 100 hours of durability.
Conclusions:
- The developed self-supporting NiFe-PBA electrocatalyst offers a promising solution for efficient and durable seawater electrolysis.
- Direct utilization of NiFe-PBA avoids energy-intensive preparation steps, highlighting the benefits of PBA-based materials.
- This research contributes to advancing the hydrogen economy through robust electrocatalyst development for sustainable energy.
