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Electron microscopy study of new composite materials based on electrospun carbon nanofibers

Abstract

To create a new type of catalytic gas diffusion layer for a high-temperature hydrogen air polymer-electrolyte membrane fuel cell (HT-PEMFC), a new electrospun carbon nanofiber (CNF)-based platinized nanocomposite was formed. Its structure was studied by scanning, high resolution transmission and scanning transmission electron microscopy, electron diffraction, EDX-analysis, electron tomography, Raman spectroscopy. The temperature dependence of morphology and structure of carbon nanofibers was investigated: high annealing temperature (1200 and 2800 оС) led to the graphitization with straight graphene layer sets in nanofiber bodies whereas curly graphene layer sets were observed for Fe-containing annealing. Platinization of CNFs with further heating at elevated temperature (280 оС) led to the formation of the spherical nanoparticles of 3.0 nm in diameter, while at room temperature “finger”-like nanoparticles with the length up to 20 nm grew along <111> directions. Structural evolution of the nanofibers resulted in the increase of their porosity, electroconductivity and thermal stability as well as formation of CNF surface relief providing smoother and more uniform platinum nanoparticle cover. The most uniform one was obtained on carbon fibers synthesized from a polymer mixture and further graphitization in the presence of iron nanoparticles.

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Publication details

The article was received on 28 Mar 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7CE00599G
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Electron microscopy study of new composite materials based on electrospun carbon nanofibers

    V. G. Zhigalina, O. Zhigalina, I. Ponomarev, K. Skupov, D. Razorenov, I. Ponomarev, N. A. Kiselev and G. Leitinger, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE00599G

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