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

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Gamayunova I. M. The influence of impurities of the transition metals Fe, Ni, and Co on hydrolysis kinetics of BH?? ions in alkaline solutions. Electrochemical Energetics, 2021, vol. 21, iss. 3, pp. 164-170. DOI: 10.18500/1608-4039-2021-21-3-164-170, EDN: DNPBZI

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The influence of impurities of the transition metals Fe, Ni, and Co on hydrolysis kinetics of BH?? ions in alkaline solutions

Gamayunova Irina Mikhailovna, Saratov State University

The influence of small amounts of the Fe, Co, and Ni impurities on the spontaneous hydrolytic process of borohydride was studied within a temperature range of 60–100°C. The object under study was a simulated solution containing 9.53 M of OH? ions and 0.14 M of BH4? ions, used as a fuel for borohydride fuel cells. The rate constant k of borohydride hydrolysis for a small amount of impurities at different temperature was estimated. The lowest non-accelerating concentrations of the impurities were established ( ? 10 ppm for iron? ? 1 ppm for cobalt). The strongest accelerating effect on the hydrolysis of BH4? ions was rendered by nickel impurities: self-hydrolysis was accelerated by 1.2 times for 1 ppm Ni. The ambiguous trend of the kinetic curves does not allow to accurately estimate the activation energy? however, the increased temperature enhances the catalytic effect of hydrolysis acceleration according to Arrhenius’ equation.


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