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

2019
Authors
Eraković, Sanja
Pavlović, Miroslav M.

Stopić, Srećko

Stevanović, Jasmina

Mitrić, Miodrag

Friedrich, Bernd

Panić, Vladimir

Article (Published version)

Metadata
Show full item recordAbstract
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 materialSource:
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