Unraveling the behavior of dual active sites of La2FeMnO6 for electrochemical oxygen generation in alkaline conditions

Metal-doped niobate pyrochlores and double-perovskites for glycerol valorization: structural and electronic properties and DFT calculations

“…The peak at 709.9 eV suggests the trivalent iron in a 3d 5 configuration, as found in the LaFe-based perovskites. 57–59 Noteworthily, the presence of the satellites close to the Fe 2 p 3/2 at 718.0 eV indicates a charge transfer during the photoemission process, as observed for perovskites. 59…”

“…Two other emission lines for O 1 s appears for the ZnNb, PbNb and LaFeMn with lower intensity at 530.3–532.0 and 533.2 eV, which is likely due to the adsorbed oxygen (O ads ) and adsorbed water molecules, and carbonates. 56–58 Of importance, the ratio between lattice (O 529 ) and adsorbed oxygen (O 530 ) can be used to estimate the concentration of oxygen defects in perovskites and niobates. 60 Accordingly, the O 529 /O 530 ratios are 0.11, 0.84, 0.23 and 0.36 for CuNb, LaFeMn, ZnNb and PbNb, respectively.…”