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Title: Clarifying the dehydrogenation pathway of catalysed Li4(NH2)3BH4-LiH composite

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/C7CP04848C· OSTI ID:1510435
 [1]; ORCiD logo [2];  [3];  [4]
  1. Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET
  2. BATTELLE (PACIFIC NW LAB)
  3. Consejo Nacional de Investigaciones Cientificas y Technicas, Instituto Balseiro, CNEA
  4. Consejo Nacional de Investigaciones Cientificas y Technicas (CONICET), Instituto Balseiro, CNEA
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The effect of different metal oxides (Co3O4 and NiO) on the dehydrogenation reactions 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 desorption temperature was lowered 32 °C for the Ni-catalysed sample, which desorbed 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 the lithium imide/amide transformation. To understand the LiH role, the Li4(NH2)3BH4-LiH-NiO and the Li4(NH2)3BH4-NiO composites were compared. The absence of LiH as a reactive 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 desorption products LiNH2 and monoclinic Li3BN2. We showed evidence for the interaction between NiO and LiNH2 during heating and we propose that the presence of Li facilitates a NHx-rich environment and the Ni catalyst mediates the electron transfer to promote NHx coupling.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1510435
Report Number(s):
PNNL-SA-129333
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 19, Issue 47
Country of Publication:
United States
Language:
English

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hydrogen storage materials
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