Electrochemical CO 2 reduction (ECR) powered by renewable electricity is reckoned to provide an effective strategy to alleviate environmental issues and energy crisis, enabling a potential carbon neutral economy. To boost the ECR to fuels and value-added chemicals, the design of highly active and selective catalysts is important. In this study, we demonstrate facile ultrasonicationfacilitated synthesis of two-dimensional copper terephthalate for efficient ECR. High faradaic efficiencies (FEs) of up to 72.9% for hydrocarbons are achieved at a mild overpotential in an H-type cell. In particular, the FE for ethylene (C 2 H 4 ) formation approaches 50.0% at an applied potential of À1.1 V (vs. the reversible hydrogen electrode), outperforming commercial Cu, Cu 2 O, CuO, Cu(OH) 2 and many recently reported Cu-based materials. The C 2 H 4 partial geometric current density is as high as $6.0 mAÁcm À2 . This work offers a simple avenue to developing advanced electrocatalysts for converting CO 2 into high-value hydrocarbons.