RESEARCH / A0456
Understanding the Role of Spin State in Cobalt Oxyhydroxides for Water Oxidation
Read the original paper · 10.1002/anie.202408005 ↗
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. Spin structure survey of as-prepared CoMOOH electrocatalysts. (a) Temperature dependence inverse susceptibilities for CoMOOH samples. The dotted lines are the fitting results by a Curie– Weiss law. (b) The corresponding eg occupation. (c–d) Co L-edge XAS spectra of CoMOOH electrocatalysts.
Figure 3. Structural investigation of CoMnOOH with intermediate spin state. (a) TEM image, (b–d) high-resolution HAADF-STEM images and (e) TEM-EDS mappings of CoMnOOH. (f) Normalized Co K-edge XANES, (g) Co K-edge EXAFS of CoMnOOH and corresponding references. (h) curve fitting of CoMnOOH. (i, j) Wavelet transform of Co K-edge EXAFS data of (i) CoOOH and (j) CoMnOOH.
Figure 5. Survey of the “eg occupation-active sites formation” relationship in CoMOOH. (a) Normalized Co K-edge XANES spectra of CoMOOH. (b) Corresponding white line intensity. (c) Illustration of the d-orbital energy regulation and *O Co(IV) formation via elongated distortion. (d) dband center of dxy orbital and dz