Figure 1.

Structural and chemical characterization as well as CO₂RR performance of Cu₂O nanocubes. TEM images of Cu₂O nanocubes in their as-prepared state (a) and after 1 h CO₂RR at −1.0 V_RHE (b). (c) Quasi-in situ Cu LMM XAES spectra of Cu₂O nanocubes in the as-prepared state and after 1 h of CO₂RR at −1.0 V_RHE without air exposure. Potential-dependent F.E. of (d) ethylene, (e) ethanol (EtOH) and 1-propanol (PrOH), (f) the sum of all C₂₊ products, and (g) H₂ and CO obtained after 1 h of CO₂RR. Solid lines are guides for the eye. All electrochemical experiments were conducted in 0.1 M KHCO₃, and the electrode potentials are given vs the RHE.