fig1

Figure 1. Morphology and structure characterizations of NiFe₂O₄-based catalysts. SEM images of (A) NiFe₂O₄, (B) Mo-NiFe₂O₄, (C)F-NiFe₂O₄ and (D) Mo/F-NiFe₂O₄; (E) TEM image, (F) iFFT-filtered HRTEM image, and (G) SAED pattern of Mo/F-NiFe₂O₄; (H) Ni L-edge and Fe L-edge EELS spectra of NiFe₂O₄, Mo-NiFe₂O₄, F-NiFe₂O₄ and Mo/F-NiFe₂O₄; (I) ADF-STEM and corresponding EELS maps of Mo/F-NiFe₂O₄.