Jump to main content
Jump to site search

Issue 47, 2017
Previous Article Next Article

Clarifying the dehydrogenation pathway of catalysed Li4(NH2)3BH4–LiH composites

Author affiliations

Abstract

The effect of different metal oxides (Co3O4 and NiO) on the dehydrogenation reaction pathways of the Li4(NH2)3BH4–LiH composite was investigated. The additives were reduced to metallic species i.e. Co and Ni which act as catalysts by breaking the B–H bonds in the Li–B–N–H compounds. The onset decomposition temperature was lowered by 32 °C for the Ni-catalysed sample, which released 8.8 wt% hydrogen below 275 °C. It was demonstrated that the decomposition of the doped composite followed a mechanism via LiNH2 and Li3BN2 formation as the end product with a strong reduction of NH3 emission. The sample could be partially re-hydrogenated (∼1.5 wt%) due to lithium imide/amide transformation. To understand the role of LiH, Li4(NH2)3BH4–LiH–NiO and Li4(NH2)3BH4–NiO composites were compared. The absence of LiH as a reactant forced the system to follow another path, which involved the formation of an intermediate phase of composition Li3BN2H2 at the early stages of dehydrogenation and the end products LiNH2 and monoclinic Li3BN2. We provided evidence for the interaction between NiO and LiNH2 during heating and proposed that the presence of Li facilitates a NHx-rich environment and the Ni catalyst mediates the electron transfer to promote NHx coupling.

Graphical abstract: Clarifying the dehydrogenation pathway of catalysed Li4(NH2)3BH4–LiH composites

Back to tab navigation

Supplementary files

Publication details

The article was received on 18 Jul 2017, accepted on 15 Nov 2017 and first published on 15 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP04848C
Phys. Chem. Chem. Phys., 2017,19, 32047-32056

  •   Request permissions

    Clarifying the dehydrogenation pathway of catalysed Li4(NH2)3BH4–LiH composites

    G. Amica, E. C. E. Rönnebro, P. Arneodo Larochette and F. C. Gennari, Phys. Chem. Chem. Phys., 2017, 19, 32047
    DOI: 10.1039/C7CP04848C

Search articles by author

Spotlight

Advertisements