Fig. 1: Structural characterizations of CoOOH. | Nature Communications

Fig. 1: Structural characterizations of CoOOH.

From: Directly synthesized cobalt oxyhydroxide as an oxygen evolution catalyst in proton exchange membrane water electrolyzers

Fig. 1

a Rietveld refinement of the XRD pattern. The observed data are plotted in open mark. The calculated pattern (red curve), the background (yellow curve), and the difference between the observed data and calculated pattern (blue curve) are also demonstrated. The standard pattern for CoOOH is shown for reference. The inset shows the layered structure of CoOOH (Co atoms in blue, O atoms in red, H atoms in pink). b High resolution TEM images. The inset shows the intensity profile of the red straight line. The blue hexagonal shape shows the atomic alignment. c XANES spectra at the Co K edge of commercial Co(OH)2, Co3O4 and LiCoO2 reference samples, with an oxidation state of Co2+, Co2.67+ and Co3+, respectively. The inset shows the energy of the Co K edge (Eedge) extracted by an integral method. d Fitting of the k3-weighted Fourier transformed EXAFS spectrum at the Co K edge of CoOOH, with the first and second shell of shaded in red and blue, respectively. The inset shows the layered atomic structure of CoOOH. Source data are provided as a Source Data file.

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