Definition of the influence of obtaining method on physical and chemical characteristics of Ni (OH)2 powders

Authors

  • Valerii Kotok Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Vadym Kovalenko Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-8012-6732

DOI:

https://doi.org/10.15587/1729-4061.2019.156093

Keywords:

Ni(OH)2, nickel hydroxide, synthesis method, cyclic voltamperometry, specific surface area, proton diffusion coefficient

Abstract

Four types of hydroxide were chosen for the study. Two of them were synthesized using the industrial method and are used in alkaline batteries. The other two nickel hydroxide powders were synthesized according to the method described in modern literature. The first hydroxide was synthesized using the hydrolytic method from a solution of nickel salt and urea. The other was synthesized from a solution containing a mixture of nickel and aluminum salts in a 4:1 ratio and was precipitated with a solution of alkali. As a result, all chosen hydroxide powders differ in physico-chemical parameters: structure, phase composition, morphology. Thus, it was revealed that the synthesis method of nickel hydroxide, and in turn, differences in structure and morphology, have a significant impact on electrochemical and other physico-chemical properties of powders.

As a result of measuring specific surface area using the dye absorption method, the measured values of the studied hydroxide were found to be 2.52 m2/g to 15.44 m2/g. The measured values were used to calculate diffusion coefficients. The diffusion coefficients were calculated for both anodic and cathodic processes, along with their averaged values. The obtained values of proton diffusion coefficients varied from 9.86∙10-15 to 9.87∙10-17 cm2/s.

Comparison and analysis of electrochemical characteristics, specific surface area values and diffusion coefficients allowed making recommendations for hydroxide application.

A mechanism was proposed, that explains the values of specific parameters, and the relation between the structure, synthesis method and physico-chemical parameters was revealed

Author Biographies

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"

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"

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Published

2019-02-13

How to Cite

Kotok, V., & Kovalenko, V. (2019). Definition of the influence of obtaining method on physical and chemical characteristics of Ni (OH)2 powders. Eastern-European Journal of Enterprise Technologies, 1(12 (97), 21–27. https://doi.org/10.15587/1729-4061.2019.156093

Issue

Vol. 1 No. 12 (97) (2019): Materials Science

Section

Materials Science

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Copyright (c) 2019 Valerii Kotok, Vadym Kovalenko

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