RESEARCH / A0575
Modulating the Asymmetric Atomic Interface of Copper Single Atoms for Efficient CO2 Electroreduction
Read the original paper · 10.1021/acsnano.2c10701 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 2. (a) Cu 2p XPS spectra, (b) N 1s XPS spectra, (c) and O 1s XPS spectra of CuN3O/C. (d) Cu K-edge XANES spectra and inset in (d) is the near - edge absorption magnification. (e) Fourier-transform EXAFS spectra at Cu K-edge. (f) FT-EXAFS fitting curve for CuN3O/ C. The inset is the atomic structure model for the CuN3O/C catalyst. (g) Formation energies of different configurations. (h) WT for the k2- weighted Cu K-edge EXAFS signals in CuN3O/C, CuCO3/C, Cu2O, and CuPc. Schematic model: Cu (yellow), N (green), O (red), and C (gray).
Figure 3. (a) LSV curves, (b) CO Faradaic efficiencies, (c) charging current density differences plotted against scan rates, and (d) ECSA- normalized current densities for CO of CuN3O/C and CuCO3/C. (e) TOF values of CuNO3/C and CuCO3/C for CO production based on the loading amount of Cu atoms at different applied potentials. (f) CO Faradaic efficiencies of CuN3O/C compared with those of other typical catalysts for ECRR-to-CO. (g) High-resolution Cu 2p spectrum of CuNO3/C after an ECRR stability test at −0.6 V vs RHE for 15 h. (h) Cu K-edge XANES spectra. The inset is a magnification of the near-edge absorption. (i) Fourier-transform EXAFS spectra at the Cu K- edge. The inset is the HAADF-STEM image of CuN3O/C after a stability test at −0.6 V vs RHE for 15 h.