Fig. 6: Wet-chemistry-assisted redox state quantification in systems with mixed redox couples. | Communications Materials

Fig. 6: Wet-chemistry-assisted redox state quantification in systems with mixed redox couples.

From: Universal method for polyvalent ions’ redox state quantification in inorganic materials down to trace concentrations

Fig. 6: Wet-chemistry-assisted redox state quantification in systems with mixed redox couples.

Normalized potentiometric curves and associated second derivatives during the titration of NaP glasses doped with a 1 cat.% of Fe (NaP-Fe), b 1 cat.% of Fe and 1 cat.% of Mn (NaP-FeMn), and c 1 cat.% of Mn (NaP-Mn). While the titration curve of the NaP-Mn sample is shown alongside those of the NaP-Fe and NaP-FeMn samples under comparable experimental conditions, its exact oxidized fraction was determined independently in an additional experiment to ensure a well-resolved equivalence volume. Optical absorption spectra of d NaP-Fe, e NaP-FeMn, and f NaP-Mn. Fe3+-, Fe2+-, Mn3+-, and Mn2+-related electronic transitions are highlighted. Slight deviations at small wavenumbers are ascribed to residual water. Photographs of the NaP-Fe, NaP-FeMn, and NaP-Mn samples are presented in the insets, highlighting the characteristic yellow, light orange, and purple colors of Fe3+-, Mn2+-, and Mn3+-containing glasses, respectively2,61.

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