Thermal Decomposition of Nickel Salt Hydrates

King, Mark K.; Mahapatra, Manoj K.

doi:10.1007/s10765-021-02960-4

Cited by 6 publications

(1 citation statement)

References 24 publications

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“…This is correlated to the NiCl 2 decomposition temperature range measured by TGA. [14,15] As the heating temperature increases to the reductive temperature of NiCl 2 (400 °C) in which pure metal is prepared, more nanoparticles are formed, and the size of particles increases up to 600 °C. [16] It could be seen that the formed nanoparticles are stable and separated without distinguishable particle migration/coalescence up to 850 °C.…”

Section: Resultsmentioning

confidence: 99%

In Situ Thermolysis of a Ni Salt on Amorphous Carbon and Graphene Oxide Substrates

Saray

Yurkiv

Shahbazian‐Yassar

2023

Adv Funct Materials

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Understanding the thermal decomposition of metal salt precursors on carbon structures is essential for the controlled synthesis of metal-decorated carbon nanomaterials. Here, the thermolysis of a Ni precursor salt, NiCl 2 •6H 2 O, on amorphous carbon (a-C) and graphene oxide (GO) substrates is explored using in situ transmission electron microscopy. Thermal decomposition of NiCl 2 •6H 2 O on GO occurs at higher temperatures and slower kinetics than on a-C substrate. This is correlated to a higher activation barrier for Cl 2 removal calculated by the density functional theory, strong Ni-GO interaction, high-density oxygen functional groups, defects, and weak van der Waals using GO substrate. The thermolysis of NiCl 2 •6H 2 O proceeds via multistep decomposition stages into the formation of Ni nanoparticles with significant differences in their size and distribution depending on the substrate. Using GO substrates leads to nanoparticles with 500% smaller average sizes and higher thermal stability than a-C substrate. Ni nanoparticles showcase the fcc crystal structure, and no size effect on the stability of the crystal structure is observed. These findings demonstrate the significant role of carbon substrate on nanoparticle formation and growth during the thermolysis of carbonmetal heterostructures. This opens new venues to engineer stable, supported catalysts and new carbon-based sensors and filtering devices.

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Section: Resultsmentioning

confidence: 99%