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Deterioration phenomena of electrochemical CO2 sensor with Pt, Na2CO3/Na2O-Al2O3- 4SiO2//YSZ/Pt structure

CO2 sensing characteristics were examined in dry condition for Pt, Na2CO3/Na2O-Al2O 3-4SiO2//YSZ/Pt structure. After settled at the working temperature at 460°C, emf was gradually decreased with time and then increased. The drift to decrease the emf observed in the initial period is due to the remove of water in Na2CO3 layer with morphological changes. The diffusion of Na ion in Na2O-Al2O 3-4SiO2 layer to YSZ layer is also one of the reason.

Characterization of LSGM films obtained by electrophoretic deposition (EPD)

The application of the electrophoretic deposition (EPD) technique to the preparation of high quality electrolyte films for intermediate temperature solid oxide fuel cells (IT-SOFCs) was investigated. Films of La0.83Sr0.17Ga0.83Mg0.17O2.83 (LSGM) were deposited on Pt and La0.8Sr0.2MnO3 (LSM) substrates from suspensions in acetone/ethanol (3:1 by volume) mixture solvent and sintered at 1300 °C. Pt supported LSGM films, 10-20 μm thick, exhibited good adhesion to the Pt substrate, well-distributed microporosity and some surface roughness.