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Kleber, Christoph
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article
Synthesis and characterization of electrodeposited hierarchical nanodendritic NiCoFe alloy powders
Abstract
Ternary Ni50Co30Fe20 powders with an open dendritic structure were made by electrodeposition. The diffusion controlled deposition allows fabrication of alloy powders with a composition corresponding to that of the electrolyte. Their morphology was studied by electron microscopy methods revealing that the particles have a highly branched dendritic structure extending from the micrometer scale to the nanoscale containing a high density of defects as grain boundaries and twin boundaries. We propose that this structure forms by massive repeated nucleation far off thermodynamical equilibrium at a high current density under strong hydrogen bubble evolution. The nanodendritic structure could be of interest for practical applications due to their high density of active sites and high surface area. The powders are envisioned for electrochemical applications.