Original scientific paper
https://doi.org/10.37023/ee.12.1-2.8
SYNTHESIS AND CHARACTERIZATION OF HEXAAMINE NICKEL HALIDES INTENDED FOR SOLID-STATE HYDROGEN STORAGE
Mirzeta Saletović
; University of Tuzla, Faculty of Natural Science and Mathematics, Department of Chemisty, Tuzla, Bosnia and Herzegovina
Filip Brleković
; Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia
*
Nina Mašić
; University of Tuzla, Faculty of Natural Science and Mathematics, Department of Chemisty, Tuzla, Bosnia and Herzegovina
Amila Jusufović
; University of Tuzla, Faculty of Natural Science and Mathematics, Department of Chemisty, Tuzla, Bosnia and Herzegovina
Amina Djedović
; University of Tuzla, Faculty of Natural Science and Mathematics, Department of Chemisty, Tuzla, Bosnia and Herzegovina
Katarina Mužina
; Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia
Stanislav Kurajica
; Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia
* Corresponding author.
Abstract
Hydrogen is a versatile energy carrier but its storing is challenging. For that reason, alternative hydrogen storage
approaches are being intensively researched. Solid state storing of hydrogen in the form of ammines offers certain advantages,
such as high storage capacity and relatively low toxicity. Therefore, in this work hexaammine complexes of nickel chloride and
nickel bromide were prepared and investigated. Ni(NH3)6Cl2 and Ni(NH3)6Br2, were obtained by precipitation synthesis. The
prepared complexes were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS),
X-ray powder diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), thermo-gravimetric analysis (TGA) and
differential scanning calorimetry (DSC). The prepared particles are polydisperse, agglomerated and show a characteristic
octahedral morphology. The samples consist solely of pure, well-crystalline, corresponding hexaamine complexes.
Ni(NH3)6Br2 shows somewhat weaker nitrogen bonds with the central cation and weaker hydrogen bonds with halogen
compared to Ni(NH3)6Cl2. Thermal analyses have shown that under the experimental conditions used, ammonia is released
from Ni(NH3)6Cl2 in three stages, while in the case of Ni(NH3)6Br2, decomposition occurs in two stages. This difference is a
consequence of the kinetic parameters of the desorption process. The maximum of the first stage of desorption occurs for the
Ni(NH3)6Cl2 sample at a slightly lower temperature than for the Ni(NH3)6Br2 sample, which is attributed to thermodynamic
factors.
Keywords
ammonia chemical storage; hexaammine nickel(II) chloride; hexaammine nickel(II) bromide; thermal analysis
Hrčak ID:
341610
URI
Publication date:
18.12.2025.
Visits: 999 *