Abstract
The effect of partial substitution of nickel by cobalt in perovskite LaNi1−xCoxO3 (0 ≤ x ≤ 0.6) oxides, synthesized by the sol–gel method, using nickel and/or cobalt nitrates, lanthanum nitrate, citric acid as chelating agent has been studied. The obtained samples were characterized by several techniques. XRD and IR analysis show that the formation of the perovskite phase occurs at 750 °C. Scanning electron microscopy (SEM) revealed that powders were composed of particles with different shape and size. The increase in the fraction of the doped-Co leads to highly agglomeration of particles while the porosity decreases. The electrochemical measurements shows that the presence of cobalt leads to a decrease of the catalytic activity attributed to the Co–Ni alloy formation. The highest electrode performance is achieved with LaNi0.6Co0.4O3 electrode. The band gap energy was calculated from the UV–Visible and it is found above 3 eV.
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Omari, E., Makhloufi, S. & Omari, M. Preparation by Sol–Gel Method and Characterization of Co-doped LaNiO3 Perovskite. J Inorg Organomet Polym 27, 1466–1472 (2017). https://doi.org/10.1007/s10904-017-0604-y
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DOI: https://doi.org/10.1007/s10904-017-0604-y