RESEARCH / A0482
Optimizing Reaction Kinetics and Thermodynamics for Photocatalytic CO2 Reduction through Spin Polarization Manipulation
Read the original paper · 10.1021/acscatal.4c03802 ↗
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 2. (A) Raman spectra and (B) Co 2p XPS spectra of Co3O4 and Co3−xO4 samples. (C) Co defect content (at%) and Co2+/Co3+ ratio of different samples according to ICP and XPS results. (D) The X-ray absorption near-edge structure (XANES) of the Co K-edge. (E) Positron annihilation lifetime spectra (PALS) of different samples and the corresponding inserted figure is the intensity of monovacancies derived from positron annihilation lifetime spectra (PALS), in which I1 is the relative intensity of τ1 (metal monovacancies). (F) Hysteresis curves of the different samples. Top view of the Co3O4 (G) and Co3−xO4 (H) model. (I) Vacancy formation energy of Co2+ and Co3+.
Figure 3. (A, B) Calculated total density of states (DOS) of Co3O4 and Co3−xO4. (C) Spin density distribution of Co3O4 and the Co3−xO4 model. The topological construction represents electron spin-up (yellow) and spin-down (blue), respectively. MCD spectroscopy of Co3O4 (D), Co3−xO4- L (E), and Co3−xO4-M (F) with and without an external magnetic field (0 and 1.6 T). (G) Co L-edge XANES of Co3O4 and Co3−xO4 samples. (H) Crystal structure and electron spin distribution of Co3O4 and Co3−xO4.