Cathodic Materials For Chemical Sources
CATHODIC MATERIALS FOR CHEMICAL SOURCES
OF THE CURRENT
F. V. Makordey, M. V. Uminsky, I. P. Kolesnikova,
N. M. Schadnih, L. D. Konovalenko
Odessa State University, Ukraine
It is well known, that oxides of transitional type metals with structure of shpinels /NiCo2O4/, perovskites, hard solutions use as catalyst for the reduction of oxygen. However a high cobalt cost partially limits using of NiO-CoO catalyst as cathodic material. Therefore, it is importantly to work out and to study new catalysts with low price and undeficient.
In this publication results of researches of electrophysical and catalytic properties of system BaFeO3 are presented. A Initial mixture of oxides Ba and Fe were received from nitric acid salts of proper metals. After the mixture were fired in temperature interval 600-1200oC. Correlation of metals in oxides mixture was changed in interval from 10 to 80%. Optimal heat temperature treatment was determined on maximum electrical conductivity of examples with relation 50% Ba and 50% Fe. Our experiment show that treatment temperature to a great extent influence upon electrophysical and electrochemical properties of oxides BaFeO3. X-ray researches show, that
Table. Electrophysical and electrochemical properties of oxides system BaFeO3
Correlation of Ba/Fe
Treatment temperature, оС
Electroconductivity, Sm
Energy of activation conductivity, E·V
Discharge capacity, mА·h
5/5
600
2.1´10-4
0.17
12
5/5
800
2.8´10-4
0.15
16
5/5
1000
5.8´10-3
0.12
35
5/5
1200
3.4´10-4
0.21
40
2/8
1000
2.5´10-6
0.25
10
4/6
1000
7.2´10-3
0.12
42
6/4
1000
5.0´10-5
0.16
18
8/2
1000
2.6´10-6
0.18
12
phases BaFeO3, BaO and Fe2O3 are formed at 700oC, at 1000oC phases BaFeO3 are formed in maximum quantity. Analyst of received examples was spent, was measured conductivity and energy of activation conductivity, potential on zinc electrode in alkaline electrolyte. The results of this tests are represented in table.
Discharge currents of BaFeO3-Zn elements at certain teusion are more then discharge currents of MnO2-Zn elements.
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