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. 2024 Sep 3;17(17):4353.
doi: 10.3390/ma17174353.

The Dependence of NiMo/Cu Catalyst Composition on Its Catalytic Activity in Sodium Borohydride Hydrolysis Reactions

Zita Sukackienė  1 , Gitana Valeckytė  1 , Virginija Kepenienė  1 , Irena Stalnionienė  1 , Vitalija Jasulaitiene  1 , Jūratė Vaičiūnienė  1 , Loreta Tamašauskaitė-Tamašiūnaitė  1 , Vidas Pakštas  1 , Eugenijus Norkus  1
Affiliations

The Dependence of NiMo/Cu Catalyst Composition on Its Catalytic Activity in Sodium Borohydride Hydrolysis Reactions

Zita Sukackienė et al. Materials (Basel). .

Abstract

The production of high-purity hydrogen from hydrogen storage materials with further direct use of generated hydrogen in fuel cells is still a relevant research field. For this purpose, nickel-molybdenum-plated copper catalysts (NiMo/Cu), comprising between 1 and 20 wt.% molybdenum, as catalytic materials for hydrogen generation, were prepared using a low-cost, straightforward electroless metal deposition method by using citrate plating baths containing Ni2+-Mo6+ ions as a metal source and morpholine borane as a reducing agent. The catalytic activity of the prepared NiMo/Cu catalysts toward alkaline sodium borohydride (NaBH4) hydrolysis increased with the increase in the content of molybdenum present in the catalysts. The hydrogen generation rate of 6.48 L min-1 gcat-1 was achieved by employing NiMo/Cu comprising 20 wt.% at a temperature of 343 K and a calculated activation energy of 60.49 kJ mol-1 with remarkable stability, retaining 94% of its initial catalytic activity for NaBH4 hydrolysis following the completion of the fifth cycle. The synergetic effect between nickel and molybdenum, in addition to the formation of solid-state solutions between metals, promoted the hydrogen generation reaction.

Keywords: H2 production; boron-hydride; catalysis; electroless plating; non-noble metals.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Scheme 1
Scheme 1
The electroless plating process of NiMo coatings on the Cu sheets.
Figure 1
Figure 1
SEM images of prepared (a) NiMo(1), (b) NiMo(5), (c) NiMo(10), (d) NiMo(15), and (e) NiMo(20) catalysts.
Figure 2
Figure 2
High-resolution XPS spectra of Ni 2p (a–e), Mo 3d (f–j), and O 1s (k–o) for different NiMo/Cu catalysts.
Figure 3
Figure 3
XRD patterns of the prepared Ni/Cu and NiMo/Cu catalysts.
Figure 4
Figure 4
H2 generation from 15 mL 5 wt.% NaBH4 + 0.4 wt.% NaOH catalyzed by the NiMo(1)/Cu (a), NiMo(5)/Cu (b), NiMo(10)/Cu (c), NiMo(15)/Cu (d), and NiMo(20)/Cu (e) catalysts at different temperatures. (a′–e′) The corresponding Arrhenius plots.
Figure 5
Figure 5
Reusability of the NiMo(20)/Cu catalyst after five cycles in 5 wt.% NaBH4 + 0.4 wt.% NaOH solution.
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