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2020•Scientific ReportsOpen access

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

Xiaoping Gao, Zhimin Sun, Jiaqi Ran, Jufu Li, Jingyan Zhang, Daqiang Gao

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Abstract

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.

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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.

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Available abstract

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.

Key concepts: Tafel equation, Electrocatalyst, Oxygen evolution, Overpotential, Perovskite (structure), Materials science, Nanoparticle, Chemical engineering

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