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Interactive promotion of supercapacitance of rare earth/CoO3-based spray pyrolytic perovskite microspheres hosting the hydrothermal ruthenium oxide

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2019
Authors
Eraković, Sanja
Pavlović, Miroslav M.
Stopić, Srećko
Stevanović, Jasmina
Mitrić, Miodrag
Friedrich, Bernd
Panić, Vladimir
Article (Published version)
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Abstract
Considerable promotion of RuO2 hosted by perovskite-like structure of rare eartheCoO3 composite and vice versa supercapacitive performances is reported. Spherical, sub-mm-sized, regular spheres of La0.6Sr0.4CoO3 (LSCO), were synthesized by ultrasonic spray pyrolysis. The sphere surface was subsequently hydrothermally doped by RuO2. LSCO and LSCO/RuO2 composites were investigated for their supercapacitive performances in alkaline solution. Microstructure and surface morphology were studied by SEM and XRD. It was found that amorphous Ru species decorate LSCO surface, and possibly incorporate partially into B-site of the LSCO lattice. Electrochemical characterization by cyclic voltammetry (CV), galvanostatic charge-discharge (G-C/DC) and electrochemical impedance spectroscopy (EIS) clearly revealed that capacitive performances of LSCO are considerably improved by addition of 20 mass. % of RuO2. The registered capacitance for LSCO/RuO2 reaches the values of pure RuO2, which reveal...s the promoting influence of LSCO on RuO2 pseudocapacitance. The EIS analysis showed that RuO2 catalyzes the redox transition of Co species, with simultaneous proportional increase in pseudocapacitive RuO2 abilities while being hosted by LSCO. This intrinsic interactive promotion introduces LSCO/RuO2 composite as unique supercapacitive material. G-C/DC curves showed that LSCO/RuO2 is of modest cyclability with respect to pure LSCO and RuO2, although the capacitance losses with cycling are acceptably low.

Keywords:
Capacitor electrodes / Oxide composites / Rare earths / Electrocatalytic interactivity / Supercapacitive material
Source:
Electrochimica Acta, 2019, 321, 134721-
Publisher:
  • Elsevier
Projects:
  • New approach in designing materials for energy conversion and energy storage systems (RS-172060)
  • Ministry and DAAD, Germany, Project No.:57334757

DOI: 10.1016/j.electacta.2019.134721

ISSN: 0013-4686

WoS: 000485837700069

Scopus: 2-s2.0-85071050628
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/3207
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