Hydrothermal synthesis of CeO2 nanostructures and their electrochemical properties
https://doi.org/10.17586/2220-8054-2020-11-3-355-364
Abstract
Functional nanomaterials based on transition metal oxides are often used for the manufacture of supercapacitors and batteries, due to their special redox properties. The nanosized transition metal oxides used as the electrode material in some cases exhibit abnormally high values of capacitance and energy density. In this regard, it is important to understand what structural features of the nanomaterial determine the electrochemical characteristics of an electronic device. For this purpose, ceria nanorods and nanocubes were specifically synthesized under hydrothermal conditions at elevated pressure (15 MPa), different alkali contents, and two temperature regimes (100 and 180 ◦C). The obtained CeO2 nanostructures were characterized using the methods of X-ray diffraction, transmission electron microscopy, and low-temperature nitrogen adsorption. The electrochemical properties of ceria nanostructures were investigated in 1 M Na2SO4 water electrolyte. The influence of the structural and surface characteristics of the synthesized nanorods and nanocubes on their charge storage ability is discussed. It was shown that CeO2 in the form of nanocubes demonstrate higher specific capacitance in comparison with nanorods, which makes them more attractive for application in supercapacitors with neutral electrolytes.
Keywords
cerium dioxide,
hydrothermal method,
nanorods,
nanocubes,
fluorite structure,
specific surface area,
cyclic voltammetry,
specific capacitance
Supporting agencies: The reported study was funded by Russian Foundation for Basic Research (Grant 18-03-01167 a). TEM studies were carried out in the Federal Joint Research Center “Material science and characterization in advanced technology”. XRD measurements were performed using Engineering Center equipment of the St. Petersburg State Technological Institute (Technical University
About the Authors
A. N. Bugrov
Institute of Macromolecular Compounds RAS; St. Petersburg Electrotechnical University ”LETI“
Russian Federation
Russian Federation
Bolshoy pr. 31, 199004 St. Petersburg
ul. Professora Popova 5, 197376 St. Petersburg
V. K. Vorobiov
Institute of Macromolecular Compounds RAS
Russian Federation
Russian Federation
Bolshoy pr. 31, 199004 St. Petersburg
M. P. Sokolova
Institute of Macromolecular Compounds RAS
Russian Federation
Russian Federation
Bolshoy pr. 31, 199004 St. Petersburg
G. P. Kopitsa
Grebenshchikov Institute of Silicate Chemistry RAS; St. Petersburg Nuclear Physics Institute, NRC KI
Russian Federation
Russian Federation
Makarova emb. 2., letter B, 199034 St Petersburg
Orlova roscha mcr. 1, 188300 Gatchina, Leningrad region
S. A. Bolshakov
St. Petersburg Electrotechnical University ”LETI“
Russian Federation
Russian Federation
ul. Professora Popova 5, 197376 St. Petersburg
M. A. Smirnov
Institute of Macromolecular Compounds RAS
Russian Federation
Russian Federation
Bolshoy pr. 31, 199004 St. Petersburg
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Review
For citations:
Bugrov A.N., Vorobiov V.K., Sokolova M.P., Kopitsa G.P., Bolshakov S.A., Smirnov M.A. Hydrothermal synthesis of CeO2 nanostructures and their electrochemical properties. Nanosystems: Physics, Chemistry, Mathematics. 2020;11(3):355–364. https://doi.org/10.17586/2220-8054-2020-11-3-355-364
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