Fig. 1.
Structural and morphological characterization of Fe0.9Co0.1OF. a Rietveld refinement showing data points (Yobs, black circles), calculated profile (Ycalc, red line), and difference profile (blue line), as indicated. Refined parameters: a = 4.68(6) Å, c = 3.06(6) Å, which are slightly larger than those of FeOF (a = 4.647 Å, c = 3.048 Å). b SEM images of the Fe0.9Co0.1OF nanorods; c, d TEM and HRTEM images of Fe0.9Co0.1OF; e, f STEM-HAADF image of Fe0.9Co0.1OF nanorod and STEM-EDS elemental mapping of Fe, Co, O, and F. Inset of a: the crystal structure of Fe0.9Co0.1OF. The insets of c: corresponding SAED pattern. The insets of d: enlargement HRTEM image of the HRTEM image. The rectangle in e denotes the EDS mapping area in f. Scale bar in b–e is 400, 50, 5, and 50 nm, respectively