Oxygen Evolution Behavior of La1−xSrxFeO3−δ Electrodes in LiCl−KCl Melt

Electrochemical reduction processes of oxides in molten salt have been proposed as the carbon free technology in order to achieve carbon neutral. The anodic behavior of La 1 − x Sr x FeO 3 − δ as an oxygen-evolution anode in LiCl−KCl at 723 K is investigated. Data suggests that at 723 K, the electrical conductivity of La 1 − x Sr x FeO 3 − δ tends to increase as the extent of Sr doping. The anodic reactions of La 1 − x Sr x FeO 3 − δ electrodes are characterized by electrochemical measurements in LiCl−KCl + Li 2 O at 723 K. Based on the cyclic voltammograms of the La 0.7 Sr 0.3 FeO 3 − δ electrode, oxygen evolution has proceeded between 2.7 V and 3.6 V. The potential of La 0.7 Sr 0.3 FeO 3 − δ electrode during galvanostatic electrolysis has conducted at 39 mA cm -2 for 15 h has remained stable at 2.8 V, indicating that the stable evolution of oxygen gas is monitored. The corrosion rate is estimated to have the low value of 8.6 × 10 −4 g cm −2 h −1 . Electrode surface data collect after electrolysis indicate that La 0.7 Sr 0.3 FeO 3 − δ electrode has excellent chemical and physical stability in LiCl−KCl at 723 K. Evidence thus indicates that La 0.7 Sr 0.3 FeO 3 − δ electrode is a promising candidate material as inert anodes for oxides decomposition. As one of application of the La 0.7 Sr 0.3 FeO 3 − δ electrode, the electrolysis reduction of CO 2 was also successfully achieved.