Co L3 and L2 edges for CoO(II), Co3O4(II,III), CoOOH(III). The Co(II) formal valence peak is about 2 eV lower than the Co (III) peak. Valence identification is best done by tracking the shift of the L3 peak, as the L3/L2 ratio is sensitive to thickness changes from plural scattering by valence excitations
By: Yao Yang
Microscope: Nion UltraSTEM (100 keV)
Energy Resolution: 0.5 eV
Note: The energy axis of the Co edge has been calibrated using dual EELS map.
By: Yao Yang
Microscope: Nion UltraSTEM (100 keV)
Energy Resolution: 0.5 eV
Note: The energy axis of the Co edge has been calibrated using dual EELS map.
Ref: Yang, PNAS, 2019, 116, 24425