fig3

Figure 3. (A) XRD patterns of O-Ni/200-3 and O-Ni-Fe/200-3 and the magnified patterns corresponding to the region at 75°-78° (2θ). (B) Full-scan XPS spectra and deconvoluted XPS spectra of (C) O 1s, (D) Ni 2p and (E) Fe 2p. XRD: X-ray diffraction; XPS: X-ray photoelectron spectroscopy.