Lattice strain and electron donation by La in Cu2O promote asymmetric active sites for efficient CO2-to-ethanol conversion
Lattice strain and electron donation by La in Cu2O promote asymmetric active sites for efficient CO2-to-ethanol conversion
研究概述
在Cu2O中掺La，利用电子给体作用和晶格应变形成不对称Cu(La)–Cu位点，稳定*OCCHO中间体并保留C–O键，促进CO2向乙醇转化。乙醇法拉第效率43.2%、C2+产物效率67.38%、C2/C1比超过10；抑制Cu+还原有助于提高运行稳定性。
谱图与表征信息
Fig. 1. (a) Synthesis diagram of La-Cu2O-x; SEM images of Cu2O (b) and La-Cu2O-3 (c). Inserted images are their TEM images; (d) XRD patterns for La-Cu2O-x and Cu2O; (e) Enlarged view of the XRD patterns in the regions of Cu2O (1 1 1) facet; (f) Raman spectra of Cu2O and La-Cu2O-x; (g) XANES spectra at the Cu K-edge for different samples; Inserted spectra are XANES spectra at the Cu K-edge from 8975 eV to 8987 eV; (h) Cu K-edge Fourier transform of the EXAFS spectra of different samples; (i) Cu–O coordination shell of Cu2O and La-Cu2O-3; The wavelet transforms (j) of Cu K-edge EXAFS data for La-Cu2O-3.