Synthesis and Characterization of Nanoporous Silver Foams

Dana Hess

Abstract


Synthesis of nanoporous silver foam was accomplished using H2 coevolution method, a method that has been successfully employed by researchers to synthesize metallic foams of Cu, Ni and Sn. This procedure was carried out in a solution of HNO3 and AgNO3. After repeating this synthesis in varying potentials and concentrations of H+ and Ag+, characterization of the foam was carried out by scanning electron microscope (SEM), powder x-ray diffraction (XRD) and energy dispersive spectrometry (EDS). EDS confirmed the foam was silver by a sharp peak at the silver n=3 to 2 (Lα1) transition value of 2.983 keV. Powder XRD confirmed a silver material with a crystal structure of , a=4.0861, α=90.0000. SEM analysis showed the presence of silver nanoparticles attached to large dendrite structures. Silver ion concentration and voltage showed direct relationships to dendrite surface imperfections and nanoparticle concentrations, while hydrogen ion concentration showed an inverse relationship.


Keywords


Electrodeposition; Batteries; Nanoparticles

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