RESEARCH / A0105
Heterojunction-Type CeO2 _Ce-NiCo2 O4 With ElectronCascade Transfer for Efficient Urea-Assisted HydrogenProduction
Read the original paper · 10.1002/adfm.75872 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
FIGURE 3 (a) Normalized Co K-edge XANES spectra of CeO2/Ce-NiCo2O4, NiCo2O4, and Co foil. The inset of the panel shows the change in the adsorption energy edge. (b) k3-weighted FT-EXAFS profiles collected at the Co K-edge of CeO2/Ce-NiCo2O4, NiCo2O4, and Co foil. (c) Normalized Ni K-edge XANES spectra of CeO2/Ce-NiCo2O4, NiCo2O4, and Ni foil. (d) k3-weighted FT-EXAFS profiles collected at Ni K-edge of CeO2/Ce-NiCo2O4, NiCo2O4, and Ni foil. (e) Normalized Ce L3-edge XANES spectra of CeO2/Ce-NiCo2O4 and CeO2. The inset of the panel shows the change in the adsorption energy edge. (f) k3-weighted FT-EXAFS profiles collected at the Ce L3-edge of CeO2/Ce-NiCo2O4 and CeO2. (g–i) Corresponding wavelettransformed EXAFS spectra of (g) CeO2/Ce-NiCo2O4, (h) Co foil, and (i) NiCo2O4 at Co K-edge.
FIGURE 6 (a) Open-circuit potential (Vocp) decay monitored for CeO2/Ce-NiCo2O4 and NiCo2O4 after the OER or UOR at 100 mA cm−2 for 120 s. (b) In situ Raman spectra of CeO2/Ce-NiCo2O4 within the potential range of 1.1–1.6 V vs. RHE in 1 m KOH with 0.33 m urea. In situ Ni K-edge XANES spectra of (c) CeO2/Ce-NiCo2O4 and (e) NiCo2O4 in 1 m KOH with 0.33 m urea. The inset of the panel shows the change in the adsorption energy edge. In situ k3-weighted FT-EXAFS profiles collected at the Ni K-edge of (d) CeO2/Ce-NiCo2O4 and (f) NiCo2O4 in 1 m KOH with 0.33 m urea. Potential-dependent EIS Bode plots of the (g/i) CeO2/Ce-NiCo2O4 and (h) NiCo2O4 electrode when potentials varied from 1.1 to 1.6 V in 1 m KOH or 1 m KOH with 0.33 m urea.