Influence of Sr Substitution on the Phase Formation and Electrochemical Properties of La1-xSrxMnO3-δ Perovskites

Editorial Board PCSS Journal; P. Kolkovskyi; M. Kolkovskyi; B. Rachiy; V. Kotsyubynsky; I. Yaremiy; S. Yaremiy; O. Vyshnevsky; T. Poveda; M. Kyrylyuk; A. Belous

doi:10.15330/pcss.27.3.591-597

Authors

P. Kolkovskyi Department of Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine
M. Kolkovskyi Department of Applied Physics and Materials Science, Vasyl Stefanyk Carpathian National University, Ivano-Frankivsk, Ukraine
B. Rachiy Department of Applied Physics and Materials Science, Vasyl Stefanyk Carpathian National University, Ivano-Frankivsk, Ukraine
V. Kotsyubynsky Department of Applied Physics and Materials Science, Vasyl Stefanyk Carpathian National University, Ivano-Frankivsk, Ukraine
I. Yaremiy Department of Applied Physics and Materials Science, Vasyl Stefanyk Carpathian National University, Ivano-Frankivsk, Ukraine
S. Yaremiy Department of Mathematics and Informatics and Methods of Teaching, Vasyl Stefanyk Carpathian National University, Ivano-Frankivsk, Ukraine
O. Vyshnevsky Department of Diamond-bearing problems, M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation, National Academy of Scienses of Ukraine, Kyiv, Ukraine
T. Poveda Department of Physics, Kamianets-Podilskyi Ivan Ohiienko National University, Kamianets-Podilskyi, Ukraine
M. Kyrylyuk Department of Dentistry, Ivano-Frankivsk National Medical University, Ivano-Frankivsk, Ukraine
A. Belous Department of Solid State Chemistry, V. I. Vernadsky Institute of General and Inorganic Chemistry, National Academy of Sciences of Ukraine, Kyiv, Ukraine

DOI:

https://doi.org/10.15330/pcss.27.3.591-597

Keywords:

perovskite, phase formation, XRD, morphology, La1-xSrxMnO3-δ, Sr substitution, modified Pechini method, electrochemical properties, supercapacitors

Abstract

La_1-xSr_xMnO_3-δ (x = 0, 0.15, 0.30 and 0.50) perovskite powders were synthesized by a modified Pechini sol-gel method. Differential thermal analysis revealed that heat treatment at approximately 800 °C is required for complete formation of the perovskite phase. X-ray diffraction analysis showed that the as-synthesized powders possess an orthorhombic perovskite-related structure (Pnma), while heat treatment at 800 °C results in the formation of a single-phase rhombohedral perovskite structure (R-3c). Scanning electron microscopy demonstrated that the powders consist of agglomerated nanoparticles with grain sizes ranging from 50 to 200 nm. Electrochemical investigations revealed that Sr substitution significantly influences the capacitive properties of La_1-xSr_xMnO_3-δ. The highest specific capacitance of 118 F g⁻¹ was obtained for La_0.7Sr_0.3MnO_3-δ, which is attributed to an optimal balance between electronic conductivity and the concentration of electrochemically active Mn³⁺/Mn⁴⁺ redox centers. The results demonstrate that controlled Sr substitution is an effective approach for tailoring the structural and electrochemical properties of La_1-xSr_xMnO_3-δ, making these materials promising candidates for supercapacitor electrode applications.

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