Fig. 2: The concentration of chromium ions calculated using cyclic voltammetry results.

a Concentration of Cr²⁺ and Cr³⁺ species calculated based on Eqs. (18) and (19). b The percent conversion from CrF₃ to Cr²⁺ species at a various weight fraction of CrF₃ added to FLiNaK salts. The red line marks the solubility limit of CrF₃ in FLiNaK reported by Yin et al.³⁹.