Sub-grain Boundaries by Cold-Rolling Copper Nanoparticles for Boosting Alkaline HER

Key Points

• This research aims to explore how a cold-rolling technique can enhance the performance of copper nanoparticles in alkaline hydrogen evolution reactions by increasing sub-grain boundaries.
• Cold-rolling strategy applied to copper nanoparticles to increase sub-grain boundaries.
• Both experimental and theoretical analyses conducted to assess the impact on hydrogen evolution efficiency.
• High density of sub-grain boundaries observed at particle interfaces.
• Enhanced alkaline hydrogen evolution reaction performance with increased sub-grain boundaries.