Fig. 2: Structural models of selected materials.
From: Copper-zirconia interfaces in UiO-66 enable selective catalytic hydrogenation of CO2 to methanol
Cu K-edge k3-weighted EXAFS and Fourier-transform spectra with fitting lines of Cu/UiO-66-a, Cu/UiO-66-b, Cu/UiO-66-a-low, and Cu/UiO-66-a-high for which the Cu–Zr path is highlighted with red arrows. The figures on the right side of each row are schematic structural models deduced from the EXAFS analyses. They show the interface bonding of sub-nanometer Cu clusters with Zr6O8 nodes for Cu/UiO-66-a (a), the non-proximity of Cu clusters with Zr6 nodes for Cu/UiO-66-b (b), the bonding of isolated Cu with Zr6 nodes for Cu/UiO-66-a-low (c) and the higher fraction of metallic Cu species for Cu/UiO-66-a-high (d, where the Cu–O and Cu–Zr paths are negligible for the EXAFS fitting).
