fig3
Figure 3. Surface Ni chemical states and reduction-induced Ni redistribution in 050Ni-LCCM. (A-D) XPS spectra of 050Ni-LCCM before and after reduction at 750 °C in H2/N2; (E and F) HAADF-STEM images and corresponding STEM-EDS Ni elemental maps of 050Ni-LCCM before and after reduction. The Ni EDS signal is displayed in red. HAADF-STEM: High-angle annular dark-field scanning transmission electron microscopy; XPS: X-ray photoelectron spectroscopy; EDS: energy-dispersive X-ray spectroscopy; LCCM: (La0.75Ca0.25)(Cr0.5Mn0.5)O3-δ.
