Magnetically Separable Co@Co–Al–O Catalysts for NaBH4 Hydrolysis: Water Activation Impact on Activity and Stability | Sciact - CRIS-system of Boreskov Institute of Catalysis

Magnetically Separable Co@Co–Al–O Catalysts for NaBH4 Hydrolysis: Water Activation Impact on Activity and Stability Full article

Journal

International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487

Output data

Year: 2025, Volume: 182, Article number : 151823, Pages count : 11 DOI: 10.1016/j.ijhydene.2025.151823

Tags

Magnetically separable catalyst; Co0 core; Co–Al–O shell; Galvanic replacement; NaBH4 hydrolysis; H2 generation; Kinetic isotope effect

Authors

Komova Oksana V. ¹ , Ozerova Anna M. ¹ , Simagina Valentina I. ¹ , Danilova Natalya A. ^1,2 , Lipatnikova Inna L. ¹ , Rogov Vladimir A. ^1,2 , Bulavchenko Olga A. ¹ , Chesalov Yuriy A. ¹ , Ishchenko Arcady V. ¹ , Netskina Olga V. ^1,2

Affiliations

1	Federal Research Center Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090, Novosibirsk, Russia
2	Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090, Novosibirsk, Russia

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

FWUR-2024-0034

The kinetic isotope effect (kH/kD, KIE) during replacement of H2O with D2O is a valuable tool for evaluating water activation in NaBH4 hydrolysis. However, its correlation with catalyst activity and stability remains unclear. In this study, two magnetically separable catalysts of different activity with a Co0 core and a “Co–Al–O″ shell were synthesized via galvanic replacement. Compared to the non-catalytic process, water activation on the catalyst surface occurs more efficiently, resulting in reduced kH/kD. The active Co-Omax catalyst contains a higher amount of oxidized phases (Co3O4, CoO, Co(OH)2, Co–Al layered double hydroxide), which reduce to the active component in the reaction medium. Their deficiency in Co-Omin causes a sharp activity decline and a drastic increase in kH/kD (>5) upon reuse, indicating a shift toward the non-catalytic pathway. In contrast, highly active Co-Omax demonstrates an efficient catalytic water activation supported by a stable kH/kD of 2.34 ± 0.05 over five cycles. The observed monotonic decrease in H2 generation rate for this catalyst is probably attributable to the hydride activation step.

Komova O.V. , Ozerova A.M. , Simagina V.I. , Danilova N.A. , Lipatnikova I.L. , Rogov V.A. , Bulavchenko O.A. , Chesalov Y.A. , Ishchenko A.V. , Netskina O.V.
Magnetically Separable Co@Co–Al–O Catalysts for NaBH4 Hydrolysis: Water Activation Impact on Activity and Stability
International Journal of Hydrogen Energy. 2025. V.182. 151823 :1-11. DOI: 10.1016/j.ijhydene.2025.151823 WOS Scopus AN OpenAlex

Submitted:	Aug 1, 2025
Accepted:	Sep 30, 2025
Published online:	Oct 3, 2025
Published print:	Oct 27, 2025

Web of science:	WOS:001589720000001
Scopus:	2-s2.0-105017572533
Chemical Abstracts:	2025:2444948
OpenAlex:	W4414824867

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