Investigation of characteristics of binary Ni–Co oxy­hydroxides for supercapacitor application

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.194618

Keywords:

binary Ni-Co oxyhydroxide, nickel cobaltate, high-temperature two-stage synthesis, specific capacity, supercapacitor

Abstract

Binary Ni-Co compounds, namely oxyhydroxides and cobaltates of nickel, are promising active compounds for supercapacitors. The characteristics of binary Ni-Co oxyhydroxides synthesized using the method of high-temperature two-stage synthesis with hot and cold hydrolysis were studied. The crystal structure of the samples was studied by means of X-ray diffraction and thermogravimetry, particle morphology –scanning electron microscopy, electrochemical characteristics – cyclic voltammetry and galvanostatic charge-discharge cycling.

By means of scanning electron microscopy, it was found that the samples of cold and hot hydrolysis are nano-structured powders composed of flower-like particles, composed of 70–90 nm thick plates. The results of XRD and thermogravimetric analyses revealed that both samples are binary Ni-Co oxyhydroxides (hydrated nickel cobaltates with different hydration levels) with the presence of pure nickel cobaltate. Hot hydrolysis samples contain less water and more nickel cobaltate. Cyclic voltammetry and galvanostatic charge-discharge cycling revealed that in the cold hydrolysis Ni-Co sample, only the nickel component is electrochemically active. The maximum capacity of the cold hydrolysis sample is 185.7 F/g (at 10 mA/cm2). With the increase of current density to 120 mA/cm2, the specific capacity drops by 4.47 times. The hot hydrolysis sample was found to have both nickel and cobalt components active: the sample having increased capacity with increasing current density from 10 mA/cm2 to 120 mA/cm2 by 1.25 times, up to 192.5 F/g. The hot hydrolysis sample was found to possess high reversibility and high effectiveness of the electrochemical component from cycle 1

Author Biographies

Vadym Kovalenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Analytical Chemistry and Food Additives and Cosmetics

Senior Researcher

Competence center "Ecological technologies and systems"

Valerii Kotok, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Senior Researcher

Competence center "Ecological technologies and systems"

Alexey Sykchin, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

Junior Reseacher

Department of Analytical Chemistry and Food Additives and Cosmetics

Assistant

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Ihor Kovalenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

Doctor of Technical Sciences, Professor

Department of Inorganic Chemistry

Oksana Berzenina, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005

PhD, Associate Professor

Department of Inorganic Chemistry

Viktoriia Stoliarenko, Kryvyi Rih State Pedagogical University Gagarina ave., 54, Kryvyi Rih, Ukraine, 50086

PhD, Associate Professor

Department Chemistry and Methods of its Teaching

Iryna Plaksiienko, Poltava State Agrarian Academy Skovorody str., 1/3, Poltava, Ukraine, 36003

PhD, Associate Professor

Department of Ecology, Balanced Еnvironmental Management and Environmental Protection

Pavlo Pysarenko, Poltava State Agrarian Academy Skovorody str., 1/3, Poltava, Ukraine, 36003

Doctor of Agricultural Sciences, Professor, First Vice-Rector

Department of Ecology, Balanced Еnvironmental Management and Environmental Protection

Marina Samojlik, Poltava State Agrarian Academy Skovorody str., 1/3, Poltava, Ukraine, 36003

Doctor of Economic Sciences, Professor, Head of Department

Department of Ecology, Balanced Еnvironmental Management and Environmental Protection

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2020-02-29

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Kovalenko, V., Kotok, V., Sykchin, A., Kovalenko, I., Berzenina, O., Stoliarenko, V., Plaksiienko, I., Pysarenko, P., & Samojlik, M. (2020). Investigation of characteristics of binary Ni–Co oxy­hydroxides for supercapacitor application. Eastern-European Journal of Enterprise Technologies, 1(12 (103), 15–23. https://doi.org/10.15587/1729-4061.2020.194618

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Vol. 1 No. 12 (103) (2020): Materials Science

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Materials Science

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Copyright (c) 2020 Vadym Kovalenko, Valerii Kotok, Alexei Sykchin, Ihor Kovalenko, Oksana Berzenina, Viktoriia Stoliarenko, Iryna Plaksiienko, Pavlo Pysarenko, Marina Samojlik

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