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

CrystEngComm ◽  
2017 ◽  
Vol 19 (27) ◽  
pp. 3792-3800 ◽  
Author(s):  
V. G. Zhigalina ◽  
O. M. Zhigalina ◽  
I. I. Ponomarev ◽  
K. M. Skupov ◽  
D. Yu. Razorenov ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Composite Materials ◽  
Carbon Nanofiber ◽  
Polymer Electrolyte Membrane ◽  
Microscopy Study ◽  
Gas Diffusion ◽  
Electron Microscopy Study ◽  
Electrolyte Membrane ◽  
New Type

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.

scholarly journals New Carbon Nanofiber Composite Materials Containing Lanthanides and Transition Metals Based on Electrospun Polyacrylonitrile for High Temperature Polymer Electrolyte Membrane Fuel Cell Cathodes

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1340 ◽  
Author(s):  
Igor I. Ponomarev ◽  
Kirill M. Skupov ◽  
Olga M. Zhigalina ◽  
Alexander V. Naumkin ◽  
Alexander D. Modestov ◽  
...  
Keyword(s):  
High Temperature ◽  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Photoelectron Spectroscopy ◽  
Carbon Nanofiber ◽  
Polymer Electrolyte Membrane ◽  
Composite Cathode ◽  
Gas Diffusion ◽  
Electrolyte Membrane ◽  
Nanofiber Mats

Electrospinning of polyacrylonitrile/DMF dopes containing salts of nickel, cobalt, zirconium, cerium, gadolinium, and samarium, makes it possible to obtain precursor nanofiber mats which can be subsequently converted into carbon nanofiber (CNF) composites by pyrolysis at 1000–1200 °C. Inorganic additives were found to be uniformly distributed in CNFs. Metal states were investigated by transmission electron microscopy and X-ray photoelectron spectroscopy (XPS). According to XPS in CNF/Zr/Ni/Gd composites pyrolyzed at 1000 °C, nickel exists as Ni0 and as Ni2+, gadolinium as Gd3+, and zirconium as Zr4+. If CNF/Zr/Ni/Gd is pyrolyzed at 1200 °C, nickel exists only as Ni0. For CNF/Sm/Co composite, samarium is in Sm3+ form when cobalt is not found on a surface. For CNF/Zr/Ni/Ce composite, cerium exists both as Ce4+ and as Ce3+. Composite CNF mats were platinized and tested as cathodes in high-temperature polymer electrolyte membrane fuel cell (HT-PEMFC). Such approach allows to introduce Pt–M and Pt–MOx into CNF, which are more durable compared to carbon black under HT-PEMFC operation. For CNF/Zr/Ni/Gd composite cathode, higher performance in the HT-PEMFC at I >1.2 A cm-2 is achieved due to elimination of mass transfer losses in gas-diffusion electrode compared to commercial Celtec®P1000.

An analytical electron microscopy study of the high temperature carbide formed in a V-5 Ti-C alloy

1980 ◽  
Vol 11 (5) ◽  
pp. 693-699 ◽  
Author(s):  
S. M. Bruemmer ◽  
C. P. Fluhr ◽  
D. V. Beggs ◽  
C. A. Wert ◽  
H. L. Fraser
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Analytical Electron
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