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(a) XPS spectra of Fe 2p core at various charge states. (b) DOS of Na2/3Fe2/9Ni2/9Mn5/9O2 at different charge states. (c) Schematic representation of the energy level versus DOS and the charge transfer from O 2p to Fe 3d. (d) Reductive coupling mechanism for the formation of Fe-(O–O) species. The oxidized Fe4+ at point II was reduced to Fe3+ at point III though electronic redistribution.
