On Activity and Stability of Rhombohedral LaNiO3 Catalyst towards ORR and OER in Alkaline Electrolyte

M. Sakthivel, S. Bhandari, J.-F. Drillet

ECS Electrochemistry Letters, 4/6 (2015), A56-A58, doi: 10.1149/2.0081506eel


LaNiO3 catalyst was synthesized by RHP method and sprayed onto a GDL. Electrochemical activity for oxygen reactions of as-prepared GDE was evaluated under half-cell condition in oxygen-saturated 7 M KOH electrolyte. Best performance in terms of potential difference ΔE between ORR and OER amounted 0.688 V @ 10 mA cm−2 for 20 wt% LaNiO3/CHSAG compared to 1 V for 20 wt% Pt/CVulcan. Moreover, by increasing perovskite:carbon weight ratio up to 3:2, ΔE in oxygen decreased down to 0.57 V that is the lowest value ever reported in the literature. However, phase segregation and loss in ORR activity was observed during cycling.

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