On activity and stability of rhombohedral LaNiO<inf>3</inf> catalyst towards ORR and OER in alkaline electrolyte

LaNiO3 catalyst was synthesized by RHP method and sprayed onto a GDL. Electrochemical activity for oxygen reactions of asprepared 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 for20 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.