Mechanistic implications of the solvent kinetic isotope effect in the hydrolysis of NaBH4

Alina Sermiagin; Dan Meyerstein; Gifty Sara Rolly; Totan Mondal; Haya Kornweitz; Tomer Zidki

doi:10.1016/j.ijhydene.2021.11.040

Mechanistic implications of the solvent kinetic isotope effect in the hydrolysis of NaBH₄

Alina Sermiagin, Dan Meyerstein, Gifty Sara Rolly, Totan Mondal, Haya Kornweitz, Tomer Zidki

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The sodium borohydride, NaBH₄, hydrolysis mechanism is studied via the H₂O/D₂O kinetic isotope effect (KIE). This reaction is of importance as NaBH₄ is considered as a hydrogen storage material. Nowadays, hydrogen is thought to be one of the most promising and efficient clean energy carriers. In order to control the rate of the hydrogen evolution reaction (HER), one has to understand the mechanism of its production. The H₂O/D₂O KIE of the reactions of NaBH₄ and NaBD₄ with water was studied in solutions containing a ratio of H₂O/D₂O = 1.00. The separation factor, α, of both reactions is α = 5.0 ± 1.0. The rate of the hydrolysis of BD₄⁻ in H₂O is faster than that of BH₄⁻. The results point out that the rate-determining step in all hydrolysis stages is the H–OH bond scission.

Original language	English
Pages (from-to)	3972-3979
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	47
Issue number	6
DOIs	https://doi.org/10.1016/j.ijhydene.2021.11.040
State	Published - 19 Jan 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Hydrogen Energy Publications LLC

Funding

A.S.wishes to thank Prof. Haim Cohen for his guidance with the MS analysis and the Ariel University for a Ph.D. student fellowship.

Funders	Funder number
Ariel University

Keywords

Borohydride hydrolysis
Hydrogen evolution
Isotopic labelling
Kinetic isotope effect (KIE)
Mechanism

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2021.11.040

Cite this

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abstract = "The sodium borohydride, NaBH4, hydrolysis mechanism is studied via the H2O/D2O kinetic isotope effect (KIE). This reaction is of importance as NaBH4 is considered as a hydrogen storage material. Nowadays, hydrogen is thought to be one of the most promising and efficient clean energy carriers. In order to control the rate of the hydrogen evolution reaction (HER), one has to understand the mechanism of its production. The H2O/D2O KIE of the reactions of NaBH4 and NaBD4 with water was studied in solutions containing a ratio of H2O/D2O = 1.00. The separation factor, α, of both reactions is α = 5.0 ± 1.0. The rate of the hydrolysis of BD4− in H2O is faster than that of BH4−. The results point out that the rate-determining step in all hydrolysis stages is the H–OH bond scission.",

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AU - Meyerstein, Dan

AU - Rolly, Gifty Sara

AU - Mondal, Totan

AU - Kornweitz, Haya

AU - Zidki, Tomer

PY - 2022/1/19

Y1 - 2022/1/19

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AB - The sodium borohydride, NaBH4, hydrolysis mechanism is studied via the H2O/D2O kinetic isotope effect (KIE). This reaction is of importance as NaBH4 is considered as a hydrogen storage material. Nowadays, hydrogen is thought to be one of the most promising and efficient clean energy carriers. In order to control the rate of the hydrogen evolution reaction (HER), one has to understand the mechanism of its production. The H2O/D2O KIE of the reactions of NaBH4 and NaBD4 with water was studied in solutions containing a ratio of H2O/D2O = 1.00. The separation factor, α, of both reactions is α = 5.0 ± 1.0. The rate of the hydrolysis of BD4− in H2O is faster than that of BH4−. The results point out that the rate-determining step in all hydrolysis stages is the H–OH bond scission.

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