Modulating the Asymmetric Atomic Interface of Copper Single Atoms for Efficient CO2 Electroreduction
Modulating the Asymmetric Atomic Interface of Copper Single Atoms for Efficient CO2 Electroreduction
研究概述
研究内容请参见论文原文。
谱图与表征信息
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.