Rare Earth Cobaltites as Oxygen Electrode Materials for Alkaline Solution

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Abstract
The perovskite‐type compounds (Ln = lanthanoid element, M = alkaline earth element, M′ = transition metal element) are examined as oxygen electrode materials for an alkaline solution. A porous sintered electrode consisting of a compound like is satisfactory in both polarization characteristics and stability under working conditions. However, a polytetrafluoroethylene (PTFE) bonded type electrode barely functions as an oxygen electrode even at a current density as low as 10 mA/ cm2. The electrode oxide undergoes reduction instead of acting as a reduction catalyst for gaseous oxygen to hydroxy ions. From a practical point of view, the sinter‐type electrodes are promising as metal‐air secondary battery cathodes because they are stable to anodic oxidation during charge periods.

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