RESEARCH / A0356
Cu-induced Ni3 + -O active sites in Prussian blue analogues enable nearly 100 % selective electrooxidation of 5-hydroxymethylfurfural to produce kilogram-scale 2,5-furandicarboxylic acid
Read the original paper · 10.1016/j.apcatb.2025.125601 ↗
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. 1. Morphology and electronic structure characterization. (a) SEM, (b) HRTEM, and (c) EDS elemental mapping images of Cu-NiFe PBA. (d) Ni K-edge XANES spectra of NiFe PBA and Cu-NiFe PBA. FT-EXAFS spectra at the (e) Fe K-edge and (f) Ni K-edge for NiFe PBA and Cu-NiFe PBA. (g) simulated bond length changes for Fe-C and Ni-N bond lengths in NiFe PBA after Cu incorporation.
Fig. 2. Structural evolution and electronic changes during alkaline etching and HMFOR. XRD patterns of (a) NiFe PBA (left) and Cu-NiFe PBA (right) in 1 M KOH as a function of etching time. (b) time-dependent surface elemental composition (Ni, Fe, N, O) during etching. FT-EXAFS spectra at the (c) Ni K-edge, (d) Cu K-edge and (e) Ni K-edge spectra for NiFe PBA and Cu-NiFe PBA after etching. In situ Raman spectra of (f) Cu-NiFe PBA (left) and NiFe PBA (right) at different potentials. (g) In situ Raman spectra of Cu-NiFe PBA (left) and NiFe PBA (right) at 1.5 V vs. RHE in KOH solution, following HMF injection.