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NEW NANOHYBRIDE CATHALYTIC SYSTEMS FOR OXYGEN REDUCTION IN RENEWABLE FUEL CELLS

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: BANU A.*, MARCU M.**, TEODORESCU V.***

Editorial: JOURNAL OF SUSTENABLE ENERGY, MARCH, VOL. 1, NO. 1, 2010.

Rezumat:

Electrocatalytic oxygen reduction (ORR)
has become the focus of considerable attention due of
its slow kinetics and the need for better
electrocatalysts for fuel cell cathodes in the recent
years.
In recent publications some results have been reported
on the electrocatalytic activity of carbon supported
polypyrrole (Ppy), polyaniline (Pani) and poly(3-
methylthiophene) (P3MT), modified with cobalt or
nickel salts. For these conductive polymer samples, the
oxygen reduction occurred at high negative
overpotential, since the polymer needs to be in
reduced state before catalytic activity can be observed.
In most of the cases the addition of cobalt or nickel in
the composite, results in an improvement in
electrocatalytic activity and a shift to electropositive
values for the ORR potentials.
In this work the hybrid materials based on
polypyrrole and cobalt-nickel oxide were studied as
oxygen reduction catalysts. Polypyrrole was
electropolimerized on carbon black and stainless steel
supported materials and modified with nickel and
nickel- cobalt oxide nanoparticles. TEM and SEM
images show porous materials with a particle size 30 to
200 nm and EDAX test confirmed the presence of
NiO and CoNiO nanoparticles into composite
materials.

Cuvinte cheie: energy, sustainable energy, materials