RESEARCH / A0193
Atomic-level dynamic spacing engineering in COF-based electrocatalysts for urea synthesis in ultra-low and wide potential ranges
Read the original paper · 10.1016/j.scib.2026.01.060 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Fig. 2. Structural characterization of dual-atom catalysts. (a) FTIR spectra of 2Cu-NiPc-DFP-COF, 2Cu-NiPc-DHDA-COF and their precursors. (b) PXRD of 2Cu- NiPc-DHDA-COF. (c) Simulated AB stacking model of 2Cu-NiPc-DHDA-COF. (d) Cu 2p XPS spectra of 2Cu-NiPc-DFP-COF and 2Cu-NiPc-DHDA-COF. (e) Normalized XANES spectra of the Cu K-edge for 2Cu-NiPc-DFP-COF and 2Cu-NiPc-DHDA-COF. Cu foil, Cu2O and CuO were used as standard samples. (f) The corresponding FT-EXAFS spectra and (g) WT contour plot of the catalysts.
Fig. 4. In-situ XAFS characterization and DFT calculation. (a-b) Cu K-edge of the in-situ XANES revealing the transformation of 2Cu-NiPc-DFP-COF and 2Cu-NiPc- DHDA-COF. The insets are the partial magnified spectra. (c-d) EXAFs of 2Cu-NiPc-DFP-COF and 2Cu-NiPc-DHDA-COF obtained from the in-situ XAFS data. Cu foil, Cu2O and CuO were used as standard samples. (e) The partial density of states (PDOS) for the Cu sites on the surface of 2Cu-NiPc-DFP-COF and 2Cu-NiPc- DHDA-COF. (f) *CONH adsorption on Cu sites of 2Cu-NiPc-DFP-COF and 2Cu-NiPc-DHDA-COF. (g) Schematic diagram of atomic-level dynamic spacing engineering for urea synthesis.