ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

For citation:

Churikov A. V., Zapsis K. V., Khramkov V. V., Smotrov M. P., Churikov M. A., Kazarinov I. A. Phase diagrams of the ternary systems NaBH4–NaOH–H2O, KBH4–KOH–H2O, NaBO2–NaOH–H2O and KBO2–KOH–H2O by -10°С. Electrochemical Energetics, 2010, vol. 10, iss. 4, pp. 170-176. DOI: 10.18500/1608-4039-2010-10-4-170-176

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Language: 
Russian
Heading: 
Hydrogen energy
Article type: 
Article
UDC: 
544.01
DOI: 
10.18500/1608-4039-2010-10-4-170-176

Phase diagrams of the ternary systems NaBH4–NaOH–H2O, KBH4–KOH–H2O, NaBO2–NaOH–H2O and KBO2–KOH–H2O by -10°С

Autors: 
Churikov Aleksei Vladimirovich, Saratov State University
Zapsis Konstantin Vasil'evich, Saratov State University
Khramkov V. V., Saratov State University
Smotrov M. P., Saratov State University
Churikov Mikhail Alekseevich, Saratov State University
Kazarinov Ivan Alekseevich, Saratov State University
Abstract: 

A study of the solubility in the ternary systems NaBH4–NaOH–H2O, KBH4–KOH–H2O, NaOH–NaBO2–H2O и KOH–KBO2–H2O is of special fundamental and practical interest. The first two systems are used as a fuel and as a hydrogen source in hydrogen power engineering that includes the low-temperature fuel cells; borohydrides are converted into metaborates. Hence, the last two systems represent the discharged by-product. The performance of such mixtures is determined by the solubility of their components, negative temperatures being especially critical. Therefore, in the present work the solubility in the ternary systems was studied by means of isothermal saturation at – 10°C. The compositions of the equilibrium liquid and solid phases and compositions of the eutonic and peritonic equilibria, and the coordinates of the homogeneous solution ranges have been determined. The best solubility of the solid components is characteristic of systems NaBH4–NaOH–H2O and KBO2–KOH–H2O.

Key words: 
three-component systems
phase diagrams
solubility
borohydrides
hydrogen power engineering
fuel cell
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Received: 
18.11.2010
Accepted: 
18.11.2010
Published: 
27.12.2010