Imaging electrochemically synthesized Cu₂O cubes and their morphological evolution under conditions relevant to CO₂...

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Copper catalysts are vital for electrochemical carbon dioxide conversion.
• Copper nanostructures with {100} facets show high selectivity for ethylene production.
• The stability of these nanostructures under reaction conditions is not well understood.

Purpose of the Study:

• To investigate the morphological evolution of copper oxide nanostructures under electrochemical carbon dioxide reduction conditions.
• To understand the stability of shape-selected copper nanostructures during catalysis.
• To explore methods for synthesizing stable copper oxide cubes.

Main Methods:

• Liquid cell transmission electron microscopy (LCTEM) was used to observe dynamic changes.
• Electrochemical synthesis was employed to form copper oxide particles.
• Controlled potential cycling was used to achieve shape-selective synthesis of copper oxide cubes.

Main Results:

• Cubic copper oxide particles formed from copper sulfate solutions.
• These cubes underwent rapid morphological evolution under carbon dioxide electroreduction conditions.
• A shape-selective synthesis method was developed using chloride ions and potential cycling.
• The observed restructuring significantly altered the electrode surface.

Conclusions:

• Copper oxide cubes are unstable under carbon dioxide electroreduction conditions, leading to significant surface restructuring.
• The stability of {100}-faceted copper nanostructures is a critical factor for selective ethylene production.
• Understanding and controlling morphological evolution is crucial for designing stable and efficient copper electrocatalysts.