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Fukumoto, Takashi
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article
Oxygen evolution behavior of La1−xSrxFeO3−δ electrodes in LiCl–KCl melt
Abstract
<jats:title>Abstract</jats:title><jats:p>Electrochemical reduction processes of oxides in molten salt have been proposed as the carbon-free technologies in order to achieve carbon neutrality. The anodic behavior of La<jats:sub>1<jats:italic>−x</jats:italic></jats:sub>Sr<jats:sub><jats:italic>x</jats:italic></jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> as an O<jats:sub>2</jats:sub> evolution anode in LiCl–KCl at 723 K was investigated. The results suggested that at 723 K, the electrical conductivity of La<jats:sub>1<jats:italic>−x</jats:italic></jats:sub>Sr<jats:sub><jats:italic>x</jats:italic></jats:sub>FeO<jats:sub>3<jats:italic>−δ</jats:italic></jats:sub> tended to increase with the Sr doping. The anodic reactions of the La<jats:sub>1−<jats:italic>x</jats:italic></jats:sub>Sr<jats:sub><jats:italic>x</jats:italic></jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrodes were characterized by electrochemical measurements in LiCl–KCl + Li<jats:sub>2</jats:sub>O at 723 K. Based on the cyclic voltammograms of the La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrode, O<jats:sub>2</jats:sub> evolution has proceeded between 2.7 and 3.6 V. The potential of the La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrode during galvanostatic electrolysis has conducted at 39 mA cm<jats:sup>−2</jats:sup> for 15 h has remained stable at 2.8 V, indicating that the stable evolution of O<jats:sub>2</jats:sub> gas was monitored. The corrosion rate was estimated to have the low value of 8.6 × 10<jats:sup>−4</jats:sup> g cm<jats:sup>−2</jats:sup> h<jats:sup>−1</jats:sup>. Electrode surface data obtained after electrolysis indicated that the La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrode exhibited excellent chemical and physical stability in LiCl–KCl at 723 K. This indicates that the La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrode is promising candidate material as inert anodes for oxide decomposition. As an application of the La<jats:sub>0.7</jats:sub>Sr<jats:sub>0.3</jats:sub>FeO<jats:sub>3−<jats:italic>δ</jats:italic></jats:sub> electrode, the electrolytic reduction of CO<jats:sub>2</jats:sub> was also successfully achieved.</jats:p><jats:p><jats:bold>Graphical Abstract</jats:bold></jats:p>