Fabrication of layered LaNi0.6Fe0.4O3-δ perovskite to enhance oxygen reduction catalytic performance

A cheap and effective electrocatalyst is a very good candidate for replacing precious metal catalysts for the diffusion of metal-air batteries. Herein, layered LaNi 0.6 Fe 0.4 O 3-δ (LNFO) was prepared via a modified sol-gel method using a carbon nanotube dispersion for pore formation. The prepared layered LNFO had an expanded specific surface area of 27.46 m 2 g −1 and uniform pores with a pore size of approximately 2 nm. The electrochemical performance of layered LNFO was tested at 1600 rpm using a rotating ring-disk electrode. It exhibited an onset potential of 0.89 V (vs. RHE), which was superior to that of bulk-LNFO (0.82 V). It also showed a half-wave potential of 0.74 V (vs. RHE), and a limited current density of 5.18 mA cm −2 . The oxygen reduction catalytic performance achieved using the modified sol-gel method was substantially higher than that achieved using the conventional synthesis method. Meanwhile, the chronoamperometric test conducted for over 7200 s demonstrated excellent catalyst stability.