Catalyst of oxygen electrode of fuel cell on the basis of vanadium pentoxide
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SOFRONKOV, Aleksandr, GAVZDIK, A.. Catalyst of oxygen electrode of fuel cell on the basis of vanadium pentoxide. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 347. ISBN 978-9975-9787-1-2.
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Materials Science and Condensed Matter Physics
Editia 8, 2016
Conferința "International Conference on Materials Science and Condensed Matter Physics"
8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016

Catalyst of oxygen electrode of fuel cell on the basis of vanadium pentoxide


Pag. 347-347

Sofronkov Aleksandr1, Gavzdik A.2
 
1 Necunoscută, Ucraina,
2 Necunoscută, Polonia
 
 
Disponibil în IBN: 6 august 2019


Rezumat

Using electrochemical combustion catalysts containing no noble metals and their alloys is very promising. By means of sol-gel technology we obtained catalysts of oxygen electrode of fuel cell on the basis of V2O5.    We obtained vanadium pentoxide sols by hydrolysis of vanadium triisopyroxide VO(OC3H7) for that 2 cm3,  containing 100 cm3 Н2О. When contacting the two fluids immediately form red gel. The gels were dispersed using a magnetic stirrer. As a result we obtained dark red homogeneous solution. Complex solutions of the polymer electrolyte were prepared by dissolving polyethylene oxide (PEO), relative molecular weight- 5.106) and orthomethanesulphonate in distilled water so as to obtain 2% solutions PEO- LiCF3SO3. Colloidal polypropyrrol solutions (PP) were obtained by oxidation of pyrrol with ferrous chloride (FeCl3).  Next we performed mixing in order to get homogeneity and dispersion of the mixture. The procedure was performed as follows: 1. Vanadium oxide PEO. Vanadium oxide colloidal solution (50 cm3) was added to a 2% aqueous solution (10 cm3) PEO- LiCF3SO3 drop by drop, under vigorous stirring till getting a homogeneous viscous solution. 2. Vanadium oxide - PEO- PP. PP 2% solution was added to a 2% aqueous solution of PEO- LiCF3SO3 drop by drop with stirring, and then vanadium oxide solution in the same manner. The resulting films were examined by X-ray diffraction and electron microscopy. The examination results showed homogeneity of the films and absence of any evolved entities. Transmission electron microscopy demonstrated that the vanadium oxide gels have a structure comprising interlacing ribbon-shaped fibers with thickness ῀15.10-6 m. From X-ray diffraction studies we established that the dashed lines at the X-rays correspond (interplanar distances -d) V2O5 and have preferential directions (perpendicular supports). Then we coated the pressed nickel electrodes with the obtained composites by casting method and dried them in vacuum oven (Р ῀10 mm Нg) at the Т=393о, and then held at the Т=773 о during an hour. The obtained electrodes were examined in an ordinary electrochemical glass cell, where the decay rate of Н2О2   was determined and polarization curves were taken, in accordance with which electrode activity was estimated.   It was demonstrated that use of sol-gel technology allows increasing electrode activity by 15-20%. The obtained results were explained basing on “the hole-complex” theory.