Perovskite Oxides Electrodes for Alkaline Oxygen Evolution Reaction
There are few literature reports on OER at perovskite-based electrodes where different carbon supporting materials were often used for increase of active surface area and conductivity [1-3]. The aim of this study was to examine the intrinsic activity of perovskite materials.
Therefore, six different perovskite oxides were used for preparation of electrodes with no carbon support, to be studied for OER in alkaline media. These were La0.8Sr0.2Fe0.8Co0.2O3, La0.7Sr0.3MnO3, La2NiO4, La1.9Pr0.1CuO4, La1.8Pr0.2NiO4 and La1.9Sr0.1NiO4. OER studies were performed using cyclic voltammetry (CV) and linear scan voltammetry (LSV) in potassium hydroxide (KOH) solution. Main reaction parameters, namely Tafel slopes, charge transfer coefficients, exchange current densities, and activation energies were determined from the LSV data. Influence of operating parameters, specifically electrolyte composition and temperature, was also investigated.
First results indicated the highest activity of La1.9Sr0.1NiO4 for the OER in the studied temperature range (25 – 85 ºC).
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