Author(s) Wei, Z.; Pashchenko, A.V.; Liedienov, N.A.; Zatovsky, I.V.; Butenko, D.S.; Li, Q.; Fesych, I.V.; Turchenko, V.A.; Zubov, E.E.; Polynchuk, Y.; Pogrebnyak, V.G.; Poroshin, V.M.; Levchenko, G.G.
Journal Phys Chem Chem Phys
Date Published 2020 Jun 07
Abstract

Manganites are multifunctional materials which are widely used in both technology and devices. In this article, new prospects of their use as nanoparticles for various types of applications are demonstrated. For that, the ferromagnetic nanopowder of LaSrMnO has been synthesized by the sol-gel method with a subsequent annealing at 700-900 °C. The crystal structure, phase composition and morphology of nanoparticles as well as magnetic, magnetothermal and electrocatalytic properties have been studied comprehensively. The critical sizes of superparamagnetic, single-domain, and multi-domain states have been determined. It has been established that an anomalously wide temperature range of magnetocaloric properties is associated with an additional contribution to the magnetocaloric effect from superparamagnetic nanoparticles. The maximum values of the specific loss power are observed in the relaxation hysteresis region near the magnetic phase transition temperature. The electrochemical stability and features of the decomposition of nanoparticles in 1 M KOH and NaSO electrolytes have been determined. A decrease in the particle size contributes to an increase in electrocatalytic activity for overall water splitting. Magnetocaloric and electrocatalytic results of the work indicate the prospects for obtaining the possibility of changing the temperature regime of electrocatalysis using contactless heating or cooling.

DOI 10.1039/d0cp01426e
ISSN 1463-9084
Citation Phys Chem Chem Phys. 2020;22(21):1181711828.

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