• Werner, J.
• Galstian, Iryna
• Dekhtyarenko, Volodymyr
• Len, Evgen
• Yakymchuk, Mykola
• Mykhailova, Halina
• Shatnii, Tatiana

Abstract

<jats:title>Abstract</jats:title><jats:p>The nanocomposites based on metals with carbon nanostructures can be used as cathode materials for low temperature thermionic converters. Such materials often have different electrophysical properties from their original components. The peculiarities of the changes in electrical conductivity of powder composites containing thermally expanded graphite (TEG) and hydrogenated titanium before and after hydrogen desorption are investigated, and the influence of hydrogen on their properties is determined. The effect of conductivity growth is found at low TEG concentration in composites with both hydrogenated and dehydrogenated titanium. It can be explained by charge transfer from the metal to the TEG components of the composites. The effect of significant increase of composite conductivity after dehydrogenation can be explained by reduction of titanium oxide shell during hydrogen desorption from metal particle and by peculiarities of Fermi level shift in it during changes of electron concentration due to charge transfer to TEG.</jats:p>

Topics

• nanocomposite
• impedance spectroscopy
• Carbon
• Hydrogen
• titanium
• electrical conductivity