Solid-State NaBH 4 /Co Composite as Hydrogen Storage Material: Effect of the Pressing Pressure on Hydrogen Generation Rate

Olga V. Netskina, Elena S. Tayban, Anna M. Ozerova, Oxana V. Komova and Valentina I. Simagina
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Olga V. Netskina: Laboratory of Hydrides Investigation, Boreskov Institute of Catalysis SB RAS (BIC SB RAS), Novosibirsk 630090, Russia
Elena S. Tayban: Laboratory of Hydrides Investigation, Boreskov Institute of Catalysis SB RAS (BIC SB RAS), Novosibirsk 630090, Russia
Anna M. Ozerova: Laboratory of Hydrides Investigation, Boreskov Institute of Catalysis SB RAS (BIC SB RAS), Novosibirsk 630090, Russia
Oxana V. Komova: Laboratory of Hydrides Investigation, Boreskov Institute of Catalysis SB RAS (BIC SB RAS), Novosibirsk 630090, Russia
Valentina I. Simagina: Laboratory of Hydrides Investigation, Boreskov Institute of Catalysis SB RAS (BIC SB RAS), Novosibirsk 630090, Russia

Energies, 2019, vol. 12, issue 7, 1-7

Abstract: A solid-state NaBH 4 /Co composite has been employed as a hydrogen-generating material, as an alternative to sodium borohydride solutions, in the long storage of hydrogen. Hydrogen generation begins in the presence of cobalt-based catalysts, immediately after water is added to a NaBH 4 /Co composite, as a result of sodium borohydride hydrolysis. The hydrogen generation rate has been investigated as a function of the pressure used to press hydrogen-generating composites from a mechanical mixture of the hydride and cobalt chloride hexahydrate. The hydrogen generation rate was observed to increase with the increase of this pressure. Pre-reduction of the cobalt chloride, using a sodium borohydride solution, leveled this dependence with a two-fold decrease in the gas generation rate. According to TEM and XPS data, oxidation of the particles of the pre-reduced cobalt catalyst took place during preparation of the composites, and it is this oxidation that appears to be the main reason for its low activity in sodium borohydride hydrolysis.

Keywords: CO 2 -free fuel; hydrogen-storage material; sodium borohydride; hydrolysis; cobalt catalyst (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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