The Multifunctionality of Lanthanum–Strontium Cobaltite Nanopowder: High-Pressure Magnetic Studies and Excellent Electrocatalytic Properties for OER

• DOI: 10.1021/acsami.3c06413
• Publication Date: 2024-01-11T20:10:58Z
• Authors: Hanlin Yu; Nikita Liedienov; Igor Zatovsky; Denys Butenko; Igor Fesych; Wei Xu; Chunrui Song; Quanjun Li; Bingbing Liu; Aleksey Pashchenko; Georgiy Levchenko
• Keywords: Cobaltite; Lanthanum

Simultaneous study of magnetic and electrocatalytic properties cobaltites under extreme conditions expands the understanding physical chemical processes proceeding in them with possibility their further practical application. Therefore, La0.6Sr0.4CoO3 (LSCO) nanopowders were synthesized at different annealing temperatures tann = 850–900 °C, multifunctional studied comprehensively. As increases, rhombohedral perovskite structure LSCO becomes more single-phase, whereas average particle size dispersion grow. Co3+ Co4+ are major components. It has been found that LSCO-900 shows two main Curie temperatures, TC1 TC2, associated a distribution. pressure P ⟨TC1⟩ ⟨TC2⟩ increase from 253 175 K ambient to 268 180 0.8 GPa, respectively. The increment ⟨dTC/dP⟩ for smaller bigger particles is sufficiently high equals 10 13 K/GPa, magnetocaloric effect nanopowder demonstrates an extremely wide peak δTfwhm > 50 can be used as one composite components, expanding its working temperature window. Moreover, all samples showed excellent performance oxygen evolution reaction (OER) process (overpotentials only 265–285 mV current density mA cm–2) minimal η10 LSCO-900. Based on experimental data, it was concluded formation dense amorphous layer surface ensures stability catalyst (at least 24 h) during electrolysis 1 M KOH electrolyte.