電解質支撐微管型固態氧化物燃料電池之製程與特性研究

Fabrication and Characterization of Electrolyte-Supported Micro Tubular SOFCs

謝文碩 ； 林鵬 ； 王錫福

《鑛冶：中國鑛冶工程學會會刊》 57卷2期 (2013/06) Pp. 26-35

https://doi.org/10.30069/MM.201306_57(2).0003

摘要

本研究以Zr0.8Sc0.2O2-δ（ScSZ）為電解質材料，以擠出成形法製備微管型之SOFCs。研究顯示塑料在成形時形狀規則且內外表面平整，具有良好的塑化性與成形性，成形後之微管燒結於1100℃~1450℃。結果顯示於1400℃時具有最佳特性，其外徑約3.8 mm，管壁厚約210μ m，相對密度可達97.1%。該燒結溫度之微管由三點抗彎測試後，其平均抗彎強度可達190 MPa以上，符合目前SOFCs高溫操作之需求，並發現燒結1400℃之微管抗彎強度優於燒結1450℃之微管（171 MPa）。最佳化之擠出微管使用沉浸法與熱膨脹收縮儀分析出最佳之共燒參數，研究顯示，電解質與陽極共燒雖有較佳的界面燒附性，但易產生裂縫而產生電池破裂，將電解質預燒至1100℃再共燒陽極於1400℃即能獲得燒附性佳且無裂縫之陽極，該電池之最高電功密度於900℃及920℃下分別為0.26 and 0.23 Wcm-2， 開路電壓皆大於1.08 V。多次熱循環後，電池機械結構依然完整。

並列摘要

Dense electrolyte supported micro tubular solid oxide fuel cells (T-SOFCs) were fabricated in this study. Green Zr0.8Sc0.2O2-δ (ScSZ) electrolyte micro-tubes with a thickness of 300 mm were successfully prepared by extrusion at room temperature. After firing at 1400℃, the bare electrolyte microtube with a thickness of 210 μm, a diameter of 3.8 mm, and a length of 40 mm had a relative density of 96.84% and a flexural strength of 190 MPa. To achieve a better sintering shrinkage match, the electrolyte micro-tubes were pre-sintered at 1100℃, coated with NiO/ScSZ (60 vol.%: 40 vol.%) in the inner surface of the micro-tubes by dip-coating method, and then cofired at 1400 ℃. After co-sintering, the interface of the porous anode layer and the dense electrolyte layer demonstrated good adhesion and mechanical integrity. Subsequently, a La0.8Sr0.2MnO3-δ (LSM)/ Ce0.8Gd0.2O2-δ(GDC) (80 vol.%:20 vol.%) cathode layer was coated on the outer surface of the micro-tubes by dip-coating method and post-sintered at 1100℃. The thicknesses of the anode and cathode layers read approximately 28 and 34 μm, respectively. After thermal cycling between 30℃ to 800℃ under 97% N2-3%H2 on the anode and air on the cathode, the micro T-SOFCs showed no delamination and retained good adhesion. The maximum power densities (MPD) of the single cell read 0.26 and 0.23 Wcm-2, respectively at 920 and 900℃, and the open circuit voltage (OCV) remained the same at 1.08 V.