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要旨

Electrochemical CO₂ reduction has attracted much attention, because of its advantageous ability to convert CO₂ gas to useful chemicals and fuels. Herein, we have developed prism-shaped Cu catalysts for efficient and stable CO₂ electroreduction by using an electrodeposition method. These Cu prism electrodes were characterized by scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. Electrochemical CO₂ reduction measurements show improved activities for C₂H₄ production with a high partial current density of −11.8 mA/cm², which is over four times higher than that of the planar Cu sample (−2.8 mA/cm²). We have demonstrated that the enhanced C₂H₄ production is partially attributed to the higher density of defect sites available on the roughened Cu prism surface. Furthermore, stability tests show a drastic improvement in maintaining C₂H₄ production over 12 h. The enhanced performance and durability of prism Cu catalysts hold promise for future industrial applications.