najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2020-11-3-355-364najo-434Research ArticleCHEMISTRY AND MATERIALS SCIENCEХИМИЯ И НАУКА О МАТЕРИАЛАХHydrothermal synthesis of CeO2 nanostructures and their electrochemical propertiesBugrovA. N.

Bolshoy pr. 31, 199004 St. Petersburg

ul. Professora Popova 5, 197376 St. Petersburg

alexander.n.bugrov@gmail.comVorobiovV. K.

Bolshoy pr. 31, 199004 St. Petersburg

vrbvrbvrb@mail.ruSokolovaM. P.

Bolshoy pr. 31, 199004 St. Petersburg

pmarip@mail.ruKopitsaG. P.

Makarova emb. 2., letter B, 199034 St Petersburg

Orlova roscha mcr. 1, 188300 Gatchina, Leningrad region

kopitsa@mail.pnpi.spb.ruBolshakovS. A.

ul. Professora Popova 5, 197376 St. Petersburg

sergey_bolshakov01@mail.ruSmirnovM. A.

Bolshoy pr. 31, 199004 St. Petersburg

Institute of Macromolecular Compounds RAS; St. Petersburg Electrotechnical University ”LETI“Russian FederationInstitute of Macromolecular Compounds RASRussian FederationGrebenshchikov Institute of Silicate Chemistry RAS; St. Petersburg Nuclear Physics Institute, NRC KIRussian FederationSt. Petersburg Electrotechnical University ”LETI“Russian Federation202030072025113355–364Copyright © Bugrov A.N., Vorobiov V.K., Sokolova M.P., Kopitsa G.P., Bolshakov S.A., Smirnov M.A., 20252025Bugrov A.N., Vorobiov V.K., Sokolova M.P., Kopitsa G.P., Bolshakov S.A., Smirnov M.A.Bugrov A.N., Vorobiov V.K., Sokolova M.P., Kopitsa G.P., Bolshakov S.A., Smirnov M.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/434

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.

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The authors declare that there are no conflicts of interest present.