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537.6/.8+538.9+539.2+621.3 (1) |
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SM ISO690:2012 KRAVCHENKO, A., PERSHINA, K.. An input of the electrode's thermoelectric properties into power of thermogalvanic cells Fe|Fe3O4|redox electrolyte|Fe|Fe3O4. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 332. |
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Materials Science and Condensed Matter Physics Ediția 9, 2018 |
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Conferința "International Conference on Materials Science and Condensed Matter Physics" 9, Chișinău, Moldova, 25-28 septembrie 2018 | |||||
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CZU: 537.6/.8+538.9+539.2+621.3 | |||||
Pag. 332-332 | |||||
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The direct transformation of the thermal energy to electric using thermogalvanic cell (TGC) is one of the attractive ways of the modern power engineering development due to possibility of such systems utilized any thermal flows as energy sources. For many years, the calculation of three parameters had been used for estimation working efficiency of TGC. These parameters are: Seebek coefficient (S), electric (r) and thermo (k) conductivities [1]. But modern conception of TGC pays more attention to nonisothermal cells, formation of the suspended systems and to their role in increasing of the thermal efficiency in the narrow temperature ranges (5 – 30 0C) [2, 3]. So, the aim of this work was the calculation of thermal effects contribution into power efficiency of the Fe|Fe3O4|redox electrolyte|Fe|Fe3O4 TGC. All tests were carried out on the disk samples with 2016 geometry. Samples contented two symmetrical electrodes based on Fe-Fe3O4-C composition. The mixture of Fe content complex salt and water solution of NaOH have been used as electrolyte. The electrode mass and the separator were pre-soaked with an electrolyte before packaging. Al thermoelectric parameters were calculated using impedance and temperature data (table 1). During experiment OCP data of TGC raised up to 500 mV. The sum of all redox reactions thermal coefficients is Σ= - 0, 226 mV/K. Thus, in temperature range 30 0C OCP has to increasing only to 6,78 mV (1,4 % of OCP common rising) . Thermoelectric input (S) averaged maximum 0,144 V in this temperature range. Electric conductivity increased more than in 10 times in all samples. So, increasing of OCP don‘t depends only on thermoelectric input, which amounted 28,8 % of OCP common rising. Therefore, remaining part of OCP depends on such factors, as formation of suspending systems on the electrode/electrolyte boundary, which caused differences in pressure and formed thermal gradients and wide thermal boundary layers. |
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