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

• Published in: Journal of alloys and compounds 2023-09, Vol.957, p.170320, Article 170320
• Main Authors: Chen, Zheqin, Xie, Yongmin, Liu, Jiaming, Zhong, Xiaocong, Xu, Zhifeng, Wang, Ruixiang
• Format: Article
• Language: English
• Subjects: Catalysis; Electrochemical reactions; Electrode materials; Energy storage materials
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.170320

A cheap and effective electrocatalyst is a very good candidate for replacing precious metal catalysts for the diffusion of metal-air batteries. Herein, layered LaNi0.6Fe0.4O3-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 m2 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. •Layered LaNi0.6Fe0.4O3-δ perovskite-type catalyst was synthesized.•Catalytic activity of synthesized catalyst was analyzed.•Layered LaNi0.6Fe0.4O3-δ had high specific area and more surface defects.•Mechanism of fabricated catalyst with for oxygen reduction was studied.•Stability of fabricated catalyst was confirmed via chronoamperometry.