RESEARCH / A0350
Ligand-rich oxygen evolution electrocatalysts reconstructed from metal-organic frameworks for anion-exchange membrane water electrolysis
Read the original paper · 10.1016/j.scib.2025.04.037 ↗
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. Coordination environment analysis of TM-ANs(I) and TM-ANs(II). (a) Fe 2p XPS spectra of MIL-53(Fe), TM-ANs(I), and TM-ANs(II). (b) Fe, Co, and Ni K-edge XANES spectra. (c) Fe R-space EXAFS spectra for TM-ANs(I), TM-ANs(II), MIL-53(Fe), and Fe-foil. (d) Co R-space EXAFS spectra for TM-ANs(I), TM-ANs(II), and Co-foil. (e) Ni R-space EXAFS spectra for TM-ANs(I), TM-ANs(II), and Ni-foil. (f) Wavelet transforms for the k3-weighted EXAFS signals of TM-ANs(I) and TM-ANs(II). (g) EPR spectra of TM-ANs(I) and TM-ANs(II).
Fig. 3. Organic ligand effects and coordination mode studies. (a) The time-dependent change in the concentration and the retention ratio of BDC ligands in the electrolyte and TM-ANs(II), respectively. (b) In-situ Raman spectra at different potentials (vs. RHE). (c) FT-IR spectra of BDC-K, MIL-53(Fe), TM-ANs(I), and TM-ANs(II). (d) Synchrotron-based C K-edge XANES spectra of MIL-53(Fe), TM-ANs(I), and TM-ANs(II). (e) The charge difference of the FeCoNiO+BDC model, where the yellow and blue isosurfaces represent electronic accumulation and depletion, respectively. (f) Electron density map of the BDC molecule in the FeCoNiO+BDC model. (g) Partial density of states (PDOS) of Fe 3d and C 2p in the FeCoNiO+BDC model. (h) Schematic for the structural evolution in the two-step reconstruction.