Determination of the possibility of obtaining ballastless Ni(II)-Ni(III) layered double hydroxides as promising active substances for supercapacitors and electrocatalysis

Authors

DOI:

https://doi.org/10.15587/1729-4061.2026.352268

Keywords:

coprecipitation at high supersaturation, coprecipitation at constant pH, Ni2 -Ni3 LDH, sodium hypochlorite

Abstract

This study is aimed to investigate the synthesis of Ni2⁺-Ni3⁺ LDH (layered double hydroxide) in the presence of sodium hypochlorite. Ni2⁺-Ni3⁺ LDH is a promising active material for use in supercapacitors and electrocatalysis. The syntheses were carried out at a temperature of 60°C by coprecipitation under conditions of high supersaturation and at constant pH values (8, 10, and 12). To obtain the guest metal cation Ni3⁺ from the initial Ni2⁺ during synthesis, sodium hypochlorite was introduced as an oxidizing agent into the alkaline sodium carbonate solution. As control samples, Ni-Al-carbonate LDH were synthesized using the same methods and conditions. The formation of Ni3⁺ hydroxo compounds during synthesis was visually confirmed by a color change. The crystal structure of the samples was investigated by X-ray diffraction analysis, and the total Ni and Ni3⁺ contents were determined by trilonometric and iodometric titration. The samples synthesized in the presence of hypochlorite exhibited a black color, confirming the successful formation of Ni3⁺ hydroxo compounds. All control samples corresponded to Ni-Al LDH. The nickel hydroxide sample synthesized by coprecipitation at high supersaturation was identified as β-Ni(OH)2, with a total Ni content of 59.5% and a Ni3⁺ fraction of 12.2%. The transformation of Ni2⁺ → Ni3⁺ occurred in the surface layer of the formed β-Ni(OH)2 particles because the oxidation rate was lower than the hydroxide formation rate. The samples synthesized by coprecipitation at constant pH exhibited a layered structure consisting of β-Ni(OH)2 and Ni2⁺–Ni3⁺ LDH with an α-type lattice, suggesting that the oxidation rate exceeded the hydroxide formation rate. Thus, the possibility of synthesizing Ni2⁺-Ni3⁺-carbonate LDH was experimentally demonstrated. Under the optimal conditions (pH 8), the proportion of the Ni-Ni LDH phase reached 55.9%. The synthesized Ni2⁺-Ni3⁺ LDH shows potential for application in supercapacitors and electrocatalysis, provided that its specific electrochemical characteristics are determined in further studies

Author Biographies

Vadym Kovalenko, Ukrainian State University of Science and Technologies

PhD, Associate Professor

Department of Analytical Chemistry and Chemical Technologies of Food Additives and Cosmetics

Dmytro Andreiev, Ukrainian State University of Science and Technologies

PhD Student

Department of Analytical Chemistry and Chemical Technologies of Food Additives and Cosmetics

Valerii Kotok, Ukrainian State University of Science and Technologies

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Alexander Baskevich, Ukrainian State University of Science and Technologies

PhD

Department of Inorganic Substances Technology and Ecology

Volodymyr Medianyk, Dnipro University of Technology

PhD, Associate Professor

Department of Mining Engineering and Education

Dmytro Sukhomlyn, Dnipro University of Technology

PhD, Associate Professor

Department of Chemistry and Chemical Engineering

Education and Research Institute of Natural Sciences and Technologies

Volodymyr Verbitskiy, National Pedagogical Dragomanov University; National Pedagogical Dragomanov University

Doctor of Pedagogical Sciences, Professor, Director

Department of Medical, Biological and Valeological Basics of Life and Health Protection

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Determination of the possibility of obtaining ballastless Ni(II)-Ni(III) layered double hydroxides as promising active substances for supercapacitors and electrocatalysis

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Published

2026-02-26

How to Cite

Kovalenko, V., Andreiev, D., Kotok, V., Baskevich, A., Medianyk, V., Sukhomlyn, D., & Verbitskiy, V. (2026). Determination of the possibility of obtaining ballastless Ni(II)-Ni(III) layered double hydroxides as promising active substances for supercapacitors and electrocatalysis. Eastern-European Journal of Enterprise Technologies, 1(6 (139), 6–15. https://doi.org/10.15587/1729-4061.2026.352268

Issue

Vol. 1 No. 6 (139) (2026): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2026 Vadym Kovalenko, Dmytro Andreiev, Valerii Kotok, Alexander Baskevich, Volodymyr Medianyk, Dmytro Sukhomlyn, Volodymyr Verbitskiy

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