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. 2024 Jul 20;10(14):e34938. doi: 10.1016/j.heliyon.2024.e34938

Fig. 5.

Fig. 5

Ti 2p XPs spectra of the CTO_RHSE and CTO_Ref samples (a–e) and dependence of the content of Ti3+/Ti4+ species in CTO and TiO2 as a function of calcination temperature (f).