Efficient CO2 Electroreduction to Multi-Carbon Products by Nanoconfinement Strategy over Cu Catalyst at Industrial Current Density

• • Cu@ADA-m achieves a maximum Faradaic efficiency for C2+ products of 86.8% at industrial current density, demonstrating high selectivity for valuable multi-carbon chemicals. • • The catalyst maintains over 80% of its initial FE C2+ after 42 hours of continuous operation at 200 mA cm−2, indicating exceptional durability for long-term industrial application. • • An energy efficiency of 38.5% for C2+ products is attained, underscoring the potential for energy-efficient CO2 conversion. • • In-situ Raman and DFT analyses confirm that the nanoconfinement strategy stabilizes Cu species and lowers C–C coupling barriers, providing mechanistic insights for rational catalyst design.