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The Co2p spectra show a doublet containing a low energy band (Co2p3/2) and a high-energy band
(Co2p1/2) at 780.4 and 795.6 eV, respectively. The energy difference between Co2p3/2 and Co2p1/2
splitting is approximately 15 eV, which indicates the presence of both Co2+/Co3+ species in all cobalt
oxide samples.
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