Synthèse et propriétés catalytiques d’oxydes mixtes à base de Néodyme et métaux de transitions

Abstract

The goal of the project is to create strong and efficient oxygen evolution reaction (OER) electrocatalysts in order to address environmental pollution and energy scarcity. The sol-gel method was used to produce the perovskite NdFe1-xNixO3, and its electrocatalytic activity towards OER was evaluated. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and electrochemical techniques like linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry were among the methods used to characterize the prepared catalysts. The outcomes demonstrated that the NdFe1-xNixO3 compounds had a roughly spherical morphology and a pure orthorhombic crystal structure over the whole substitution range. The compounds were calcined at 800 ◦C. The calculated average diameters of crystallites are 19–24 ± 0.5 nm. The NdFe0.8Ni0.2O3 electrode, in particular, showed remarkable electroactivity, displaying lowest over potential (310 mV vs RHE) required to achieve a current density of 10 mA.cm−2, the lowest Tafel slope (149 mV.dec-1), and good stability over a 60-hour period, the NdFe0.8Ni0.2O3 electrode stood out for its exceptional electroactivity. These results offer insightful information about the development and design of high-performance electrocatalysts for uses in sustainable energy conversion and storage.