In situ liquid cell electron microscopy with simultaneous control of heating, biasing and flow
Copper-based catalysts are among the most promising materials for electrochemical CO₂ reduction because of their ability to generate value-added hydrocarbons and oxygenates. In this study, liquid-phase TEM was used to directly visualize the formation and evolution of Cu₂O nanocubes under electrochemical conditions relevant to CO₂ reduction. The work revealed how catalyst morphology continuously changes during operation, providing important insights into catalyst stability, restructuring, and performance during electrocatalytic reactions.