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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:25 |
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Conference: Bucharest University Faculty of Physics 2021 Meeting
Section: Physics and Technology of Renewable and Alternative Energy Sources
Title:
Thermoelectric materials based on Cobalt Oxide for humidity sensor applications in high-temperature
Authors:
Esmaeil JALALI LAVASANI(1,2), George ZĂRNESCU(2), Ioan STAMATIN(1,2)
*
Affiliation:
1) University of Bucharest, Faculty of Physics, PO Box MG 38, 077125, Bucharest-Magurele, Romania
2)University of Bucharest, Faculty of Physics, 3NanoSAE Research Center, PO Box MG 38, 077125, Bucharest-Magurele, Romania
E-mail
gzarnescu@gmail.com
Keywords:
thermoelectric material, moisture effect, cobaltite oxide, humidity sensor
Abstract:
Thermoelectric generators are promising systems for harvesting energy from any heat source with temperature gradient. When the difference temperature is constant, the output voltage is almost fixed. However, many parameters can affect thermoelectric properties and output voltage. In this study, the effect of humidity on the thermoelectric properties of Calcium Barium Cobaltite Oxide was investigated. The experiment observation has shown that if the thermoelectric being exposed to moisture, they can exhibit different behaviors. In addition, the type of this reaction depends on the kind of moisturizing material. In this experiment, the Calcium Barium Cobaltite Oxide tablet with 30 mm diameter and 3 mm height was put at 353 K constant temperature difference and was used the Aluminum collectors to measure the voltage output. Water and Ethanol exposed the material to moisture in regular periodic time. The observation has illustrated that an amount of voltage is repeated in regular intervals with constant moisture. Calcium Barium Cobaltite Oxide under the influence of 4 µl of water reaches 1.4 V and then returns to the initial voltage (250 V) after fifteen minutes and it can repeat regularly. For the same amount of ethanol, this voltage was 400 mV and the return time to the initial value was 5 minutes.
Therefore, due to the reaction with humidity and reversible voltage change too, this material can be used as a moisture sensor. As well, Calcium Barium Cobaltite Oxide is a type of ceramics, so, it can be used as a humidity sensor especially in high-temperature environments such as ovens and power plants.
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