Double Perovskite LaFexNi1−xO3 Nanorods Enable Efficient Oxygen Evolution Electrocatalysis

Double perovskite nanorods LaFe_x Ni_1−x O₃ (LFNO NRs) with reduced diameter have been successfully created and adopted as efficient OER catalysts. The optimized LFNO NRs have proper d‐band electronic structure, enabling strong binding between adsorbates and NRs, which boosts their intrinsic OER activity.

Abstract

Perovskite‐based electrocatalysts are one of the most promising materials for oxygen evolution reaction (OER), but their activity and durability are still far from desirable. Herein, we demonstrate that the double perovskite LaFe_x Ni_1−x O₃ (LFNO) nanorods (NRs) can be adopted as highly active and stable OER electrocatalysts. The optimized LFNO‐II NRs with Ni/Fe ratio of 8:2 achieve a low overpotential of 302 mV at 10 mA cm⁻² and a small Tafel slope of 50 mV dec⁻¹, outperforming those of the commercial Ir/C. The LFNO‐II NRs also show high OER stability with slight current decrease after 20 h. The enhanced activity is explained by the improved surface area, tailored electronic structure as well as strong hybridization between O and Ni.

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