| Autor: |
Tang, Eric Z., Ivey, Douglas G., Etsell, Thomas H. |
| Zdroj: |
Micron; August 1998, Vol. 29 Issue: 4 p251-259, 9p |
| Abstrakt: |
Many types of electrocrystallization microstructures have been studied for depositions from aqueous solutions and molten salt electrolyte systems. However, our knowledge is still limited for solid electrolyte systems. This paper presents initial microstructural results of the product phases produced during polarized electrochemical vapor deposition (PEVD), which takes advantage of a solid state ionic material to transport the reacting species and utilizes electrochemical reaction of the ionic species with the vapor phase for deposition. The microstructure of PEVD products during various deposition conditions has mainly been characterized using scanning electron microscopy (SEM). In this study, a PEVD product (Na2CO3) was deposited on the cathode of a CO2potentiometric sensor. Preferred growth and a faceted structure oriented along the porous Pt electrode surface were found. The unique electrocrystallization microstructure of the PEVD products is due to the availability of the reacting species for electrochemical reaction, electronic or ionic shorting at the substrate surface, and the preferred crystallographic direction for ionic conduction in the product phase during both crystal nucleation and growth stages. The product microstructural studies indicate that PEVD is an attractive thin film deposition technique to improve the solid electrolyte/electrode contact in a number of solid state ionics devices, such as sensors and fuel cells. Furthermore, the studies in this paper also suggest that the microstructure of the PEVD products is related to the thermodynamic considerations for the electrochemical reaction in PEVD and electrical properties for the PEVD product phase. |
| Databáze: |
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