Fast initializing solid state electrochemical carbon dioxide sensor fabricated by a tape casting technique using yttria stabilized zirconia and sodium beta alumina heterojunction

Autor: Chong-Ook Park, Tae-Wan Kim, Soomin Oh, Hyeuk Jin Han, Seongwan Kim
Rok vydání: 2017
Předmět:
Zdroj: Sensors and Actuators B: Chemical. 248:856-861
ISSN: 0925-4005
DOI: 10.1016/j.snb.2016.12.139
Popis: Solid-state bi-electrolyte carbon dioxide sensors with an yttira stabilized zirconia (YSZ) and sodium beta alumina (NBA) heterojunction were fabricated using the tape casting method to measure CO 2 concentrations in the air. The enhanced interface between NBA, expressed by (1 + x) Na 2 O·11 A1 2 O 3 and YSZ was made by the liquid phase sintering method while varying the ratio of Na 2 O/Al 2 O 3 from x = 0 to x = 0.6. YSZ/Pt electrode was used as an air reference, maintaining a constant oxygen concentration of 21%, and Na 2 CO 3 was used as a CO 2 sensing electrode. The responses of the sensors to various concentrations of CO 2 were evaluated at temperatures ranging from 550 °C to 650 °C. The electric potential difference of the sensors exhibited Nernstian behavior with sensitivity greater than 99% of the theoretical value at 650 °C. The activity of Na 2 O at the bi-electrolyte junction remained constant, showing invariance with the CO 2 concentrations tested. The time for the initial stabilization was as short as 66 s.
Databáze: OpenAIRE
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