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Sub-grain boundaries by cold-rolling copper nanoparticles for boosting alkaline HER.
Le Shuai1, Chuanqi Cheng1,2, Wenxuan Lv1
1Institute of New-Energy Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China. tjuccq@tju.edu.cn.
Chemical Communications (Cambridge, England)
|June 16, 2026
Summary
Cold-rolling copper nanoparticles creates sub-grain boundaries that boost alkaline hydrogen evolution reactions. These boundaries facilitate water splitting, improving catalytic efficiency for clean energy applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- The hydrogen evolution reaction (HER) is crucial for clean energy production.
- Developing efficient electrocatalysts for alkaline HER remains a challenge.
- Nanostructured materials offer unique properties for catalysis.
Purpose of the Study:
- To investigate a novel cold-rolling strategy for modifying copper (Cu) nanoparticles.
- To understand the role of engineered sub-grain boundaries in enhancing catalytic activity.
- To improve the performance of Cu nanoparticles in alkaline hydrogen evolution reactions.
Main Methods:
- Employing a cold-rolling technique to introduce defects in Cu nanoparticles.
- Utilizing experimental characterization to analyze the generated microstructure.
- Performing theoretical calculations to elucidate the catalytic mechanism at the sub-grain boundaries.
Main Results:
- Successfully generated a high density of sub-grain boundaries within Cu nanoparticles, primarily at interfaces.
- Identified sub-grain boundaries as key sites for interfacial water dissociation.
- Demonstrated a significant enhancement in alkaline HER performance due to the presence of these boundaries.
- Lowered the energy barrier for the hydrogen evolution reaction.
Conclusions:
- Cold-rolling is an effective strategy for engineering sub-grain boundaries in Cu nanoparticles.
- Sub-grain boundaries play a critical role in facilitating water dissociation and improving alkaline HER.
- This approach offers a promising pathway for developing advanced electrocatalysts for hydrogen production.
