| Autor: |
Seong Kyun Kim, Hyeon Jin Lee, Jin Young Moon, Yong-Ryun Jo, Jinsil Lee, Ji-Hoon Park, Sun-Dong Kim, Jong Hoon Joo |
| Zdroj: |
Journal of Materials Chemistry A; 4/14/2024, Vol. 12 Issue 14, p8319-8330, 7p |
| Abstrakt: |
Solid oxide electrolysis cells (SOECs) have garnered interest as efficient systems for hydrogen production through water electrolysis. One critical limitation hindering the widespread adoption of this technology is the long-term degradation of electrodes. In addition, ensuring the durability of the electrolyte remains a significant challenge. This study delves into the degradation mechanism of yttria-stabilized zirconia (YSZ) with varying Y2O3 compositions under an applied electric potential. In a comprehensive investigation of the degradation behavior of YSZ electrolytes with Y2O3 doping ranging between 8 and 10 mol%, the 8YSZ composition exhibited a pronounced reduction in ionic conductivity compared to 9.5YSZ and 10YSZ. Although 8YSZ exhibits the highest ionic conductivity, it has been determined that, under SOEC operating conditions, a Y2O3 doping concentration exceeding 8 mol% is required for stability owing to the precipitation around the electrode induced by the electric field. Electrical analysis, X-ray diffraction, Raman spectroscopy, and transmission electron microscopy were utilized to assess the degradation behavior of the electrolyte. K-means clustering was applied to highlight the disorder in defects observed through energy-dispersive spectroscopy. This study elucidates the underlying mechanisms governing electrolyte degradation in SOECs and recommends optimal YSZ compositions for prolonged operation, considering thermal stability and durability under SOEC operating conditions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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