High efficiency electrocatalyst of LaCr0.5Fe0.5O3 nanoparticles on oxygen-evolution reaction

Abstract

Due to the multistep proton-coupled electron transfer, it remains a huge challenge to accelerate the kinetics of oxygen evolution reaction (OER). Here, we demonstrate that perovskite-type LaCr 0.5 Fe 0.5 O 3 nanoparticles can be used as highly active and stable OER electrocatalysts, where it shows a low overpotential of 390 mV at 10 mA/cm 2 , a small Tafel slope of 114.4 mV/dec and excellent stability with slight current decrease after 20 h, superior than that of their individual counterparts (LaFeO 3 and LaCrO 3 ). This finding confirms that the present hybrid material would be an effective means to electrocatalyst for catalyzing OER.

A Review on Perovskite-Type LaFeO3 Based Electrodes for CO2 Reduction in Solid Oxide Electrolysis Cells: Current Understanding of Structure–Functional Property Relationships

“…72 This composition also displays excellent oxygen evaluation reaction (OER) performance. 73 The addition of manganese, La-Fe 1−x Mn x O 3 , drives a disorder induced localization of charge carriers. This in turn increases the overall electrical conductivity as a function of Mn content, up to x = 0.5.…”

“…The main composition of interest is LaFe 0.5 Cr 0.5 O 3 as the conductivity reaches a maximum . This composition also displays excellent oxygen evaluation reaction (OER) performance . The addition of manganese, LaFe 1– x Mn x O 3 , drives a disorder induced localization of charge carriers.…”

High-Efficiency of Bi-Functional-Based Perovskite Nanocomposite for Oxygen Evolution and Oxygen Reduction Reaction: An Overview

“…The conventional sol–gel used to develop the perovskite-type LaCr x Fe 1−x O 3 nanoparticle with a higher surface area for OER applications [ 94 ]. As shown in Figure 12 , the linear sweep voltammetry (LSV) of LaCr 0.5 Fe 0.5 O 3 reveals an OER overpotential of 390 mV at 10 mA/cm 2 , which is significantly lower than 510 mV of LaFeO 3 and 550 mV of LaCrO 3 .…”

“… ( a ) The polarization curves and ( b ) overpotential at 10 mA/cm 2 of LaFeO 3 , LaCrO 3 and LaCr 0.5 Fe 0.5 O 3 for OER. Copyright 2020 by the Springer Nature [ 94 ]. …”

High-Performance Perovskite Bifunctional Electrocatalysts for Oxygen Reduction Reaction and Oxygen Evolution Reaction

“…Suntivich et al demonstrated that electrocatalytic activity for the ORR and OER is decided by some parameters, , like the number of 3d electrons and their spin state in transition metals, covalency of transition metal–oxygen bonds, positions of d-band centers of transition metals, and p-band centers of oxygen relative to the Fermi level, which can be changed by increasing the oxygen vacancy concentration and maintaining the redox couples. Some previous studies have proved that moderate oxygen vacancies in oxides can increase the electrocatalytic activity for the ORR and OER at room temperature. − …”