II International Symposium on Carbon for Catalysis ABSTRACTS

KL-2
NITROGEN DOPED CARBON NANOFIBERS AND AMORPHOUS CARBONS FOR
PEMFC CATHODE CATALYST PREPARATION
Ismagilov Z.R., Shalagina A.E., Podyacheva O.Yu., Shikina N.V., Barnakov Ch.N.,
Lisitsyn S.A., Kerzhentsev M.A., Ismagilov I.Z., Sakashita M. 1 , Keller V. 2 , Bernhardt P. 2
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
1 JATIS, Japan
2 ULP-ECPM-ELCASS, Strasbourg, France
e-mail: zri@catalysis.ru
The oxygen reduction activity of cobalt and iron cations on the surface of carbon supports
can be considerably improved by bounding to nitrogen atoms doped to carbon material. This
type of electrocatalysts is considered to be promising for partial or complete replacement of
platinum in conventional cathode catalysts.
In this lecture we will report results of research comprising following main goals:
(1) development and characterization of N-containing carbon support materials of two
types: N-doped carbon nanofibers (NCNF) and N-containing amorphous carbons (NAC);
(2) development of preparation procedures and characterization of electrocatalysts
obtained by deposition of Co on the surface of these supports.
For the preparation of NCNF, the method of decomposition of C 2 H 4 -NH 3 mixture on
metal catalysts Ni-Cu-Al 2 O 3 , Fe-Cu-Al 2 O 3 etc. at temperatures 550-675 °C was used. NCNF
belong to a family of mesoporous graphitic materials as was confirmed by XRD, XPS, TEM
and adsorption methods. Depending on preparation conditions nanofibers with an average
pore diameter 5–19 nm and S BET 30 – 350 m 2 /g can be produced. TEM studies showed that
NCNF have a fishbone type structure with a fiber diameter of 60-100 nm. The fibers are
twisted into spirals. The dependencies of NCNF yields on the nature of the catalyst and
temperature were studied. The highest NCNF yields were observed at a low temperature
550°C on the catalyst Ni-Cu-Al 2 O 3 (up to 70 g/g cat. after 20 h). The dependencies of N content
on the catalyst nature, reaction time and temperature were studied. Lower temperature and
short time on stream are favorable for formation of NCNF with a higher N content - up to
7 wt. %.
NAC materials were prepared by chemical and subsequent thermal treatment of various
N-containing organic precursors, or their mixtures: o-nitroaniline, 8-oxyquinoline,
benzotriazole, etc. The obtained products have N content in the range of 0.5-8 wt.%. The
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