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Journal of Sol-Gel Science and Technology

Erschienen in:

30.07.2020 | Original Paper: Sol-gel and hybrid materials for energy, environment and building applications

Synthesis and electrocatalytic properties of LaFe_1-xZn_xO₃ perovskites

verfasst von: Elies Omari, Mahmoud Omari

Erschienen in: Journal of Sol-Gel Science and Technology | Ausgabe 1/2020

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Abstract

In this work, perovskite-type oxides of general formula LaFe_1-xZn_xO₃ (0 ≤ x ≤ 0.3) prepared by a sol–gel route were investigated as electrocatalysts for the oxygen evolution reaction (OER) in alkaline KOH solutions. X-ray diffraction analysis of samples indicates that the pure cubic structure was obtained for composition lower than x = 0.2. The OER studies indicate that substitution of iron by zinc increases the electrocatalytic activity of the resulting material significantly. The highest activity was achieved for x = 0.1, whereas the obtained current density was 9.02 mA cm⁻² at 0.66 V, which is approximately three times higher than that of the base oxide. The Tafel slopes values for OER on each oxide in 1 M KOH are found to be ~89, 52, and 64 mV dec⁻¹ for LaFeO₃, LaFe_0.9Zn_0.1O₃, and LaFe_0.8Zn_0.2O₃, respectively. The stability of LaFe_0.9Zn_0.1O₃ electrode is studied in the process of 1000 successive cycles at a current density of 10 mA.cm⁻² of the OER. A small change in overpotential was found, ranged between 11 and 19 mV, indicating clearly its long electrochemical durability. These results suggest clearly that LaFe_0.9Zn_0.1O₃ electrode is a promising anode material for the OER in water electrolysis.

Vorheriger Artikel SiO2/silicone hybrid superhydrophobic coating on gypsum-based materials with self-cleaning and moisture resistance

Nächster Artikel Characteristics and photocatalytic activity of highly c-axis-oriented ZnO thin films

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Titel: Synthesis and electrocatalytic properties of LaFe1-xZnxO3 perovskites
verfasst von: Elies Omari
Mahmoud Omari
Publikationsdatum: 30.07.2020
Verlag: Springer US
Erschienen in: Journal of Sol-Gel Science and Technology / Ausgabe 1/2020
Print ISSN: 0928-0707
Elektronische ISSN: 1573-4846
DOI: https://doi.org/10.1007/s10971-020-05379-9

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