AuCu bimetallic nanourchins with low-coordinated sites for highly efficient electroreduction of CO 2 to acetate at low potential

An AuCu bimetallic nanourchin electrocatalyst, rich in low-coordinated Au/Cu atoms, achieves an impressive ∼100% faradaic efficiency (FE) for reduction of CO2 to multicarbon (C2+) products, including 63.8% acetate and 36.2% ethanol at an ultralow potential of -0.4 V versus RHE. This work establishes a novel paradigm for the precise nanostructure engineering of AuCu bimetallic electrocatalysts toward efficient synthesis of high-value C2+ products.