II International Symposium on Carbon for Catalysis ABSTRACTS

OP-I-29
ELECTROCATALYTIC PROPERTIES OF PLATINUM DISPERSED IN PORES OF
CARBON SKT-6A
Efimov O.N., Vershinin N.N. 2 , Karpacheva G.P. 1 , Zemtsov L.M. 1 , Efimov M.N. 1
Institute of Problems of Chemical Physics RAS, Chernogolovka, Russia
1 A.V. Topchiev Institute of Petrochemical Synthesis RAS, Moscow, Russia
2 JSC “VEAL Sensor”
e-mail: vernik@icp.ac.ru
Development of electrochemical gas sensors and hydrogen-oxygen fuel cells requires
producing electrode materials which has long been operated. Electrode material must possess
good electronic and ionic electroconductivity, high catalytically active surface and porosity
nesessary for reagents feed and reaction products removal. Finely dispersed platinum may be
supported on the surface of electrolyte or carbon carrier with developed specific surface
(activated carbon) with chemical, electrochemical or other methods. Nanocarbon materials or
carbon materials with developed specific surface are usually used for the fixing of finely
dispersed platinum on the carbon particle surface or inside of carbon particles. We chose
carbon SKT-6A (specific surface S ≅ 1000 m 2 /g) as a carbon carrier for finely dispersed
platinum. Method of synthesis and fixing of finely dispersed platinum in carbon pores was
developed. A procedure for the synthesis of a platinum catalyst using SKT-6А carbon as a
support was developed, which involves the impregnation with polyacrylonitrile (PAN) and
H 2 PtCl 6 dissolved in dimethylformamide (DMFA) followed by the IR pyrolysis in a special
IR-annealing chamber of a photonic pulse annealing set-up. The intensity of IR radiation was
controlled by the temperature of the film sample, measured by a chromel-coppel
thermocouple in quartz tube placed directly under the sample. Controlling unit provided the
changes in intensity of IR radiation at a given computer program. Temperature of the sample
was maintained within 0.25 ºС. IR annealing was performed in two stages: preliminary
annealing (in air at 150 ºС for 15 minutes, then at 200 ºС also for 15 minutes) and main
intensive annealing (in argon at 450 o C during 30 min). Efficient reduction of metal takes
place in the course of IR pyrolysis of composite-precursor (DMFA solution of PAN and
H 2 PtCl 6 ) with participation of hydrogen, which is released in dehydrogenation of main
polymeric chain of PAN.
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