Fig. 4
Materials characterization of electrodeposits. a SEM (scale bar: 200 nm) and b HRTEM (scale bar: 5 nm) images of NiCeO x H y . The inset shows SAED pattern (scale bar: 5 1/nm). c FTIR spectra of powdery NiCeO x H y , Ni(OH)2, and CeO2. d, e XPS spectra of powdery Ni(OH)2 and NiCeO x H y . f Ce 3d XPS spectra of CeO2 and NiCeO x H y
