粉體物性及沉積條件對氣膠沉積法製備SOFC電解質膜層之影響

本研究利用氣膠沉積法 (Aerosol deposition method, ADM)製備出不同厚度之SOFC電解質膜層，以8YSZ粉體噴塗於NiO-SDC陽極基板形成電解質膜層，當中藉由粉體物性及機台製程參數兩大方向對膜層變化進行探討。在粉體形態部分，將粉體烘乾溫度提升至200oC持溫1 h可有效增加粉體間流動性及分散性以利於氣膠沉積噴塗，而將粉體中位徑值從0.08 μm增加為4.14 μm，可增加粉體撞擊基板之動能，使顆粒擊碎成奈米大小尺寸並在短時間內且室溫下製備出厚度約2 μm緻密膜層。從機台製程參數探討，得知載流氣體流量為4 L/min、噴嘴與基板間工作距離為5 mm，使用直徑0.7 mm口徑噴嘴再搭配100oC~400oC不同基板溫度，可成功改善膜層均勻性及附著性，且隨著基板溫度增加可改變電解質膜層厚度，製備出不同厚度之緻密電解質膜層。後續單元電池探討，以改變基板溫度製備出四組不同厚度之電解質膜層進行量測，其電解質膜層厚度依序為2.7 μm、3.6 μm、 5.3 μm及9.3 μm，其中基板溫度100oC所製備出的單元電池具有最佳性質，其開路電壓於操作溫度800oC時為0.91 V，最大電功率密度於操作溫度800oC則增加為0.60 W/cm2，歐姆阻抗和極化阻抗在操作溫度為800oC分別降低為0.10 Ω•cm2和0.23 Ω•cm2，由此得知利用氣膠沉積法可在更短快製程時間，且更簡易的製程製備出具有不同厚度且性質優異之電解質膜層。

關鍵字

氣膠沉積法；固態氧化物燃料電池；電解質； 8YSZ

並列摘要

In this study, dense, crack-free and various film thicknesses of 8 mol% yttria stabilized zirconia (8YSZ) films were successfully deposited on porous NiO-SDC substrates by aerosol deposition method (ADM). Adjusting powder properties and deposition parameters could improve the performance of 8YSZ electrolyte layer. It was found that preheat-treatment of 8YSZ powders at 200oC could significantly improve the dispersibility of the powders during the aerosol deposition. Increasing the median size of 8YSZ particles from 0.08 μm to 4.14 μm could increase the kinetic energy of powders after impact on NiO-SDC substrate that the micron-size ceramic particles were fractured into nano-size particles and subsequently formed the dense electrolyte of 2.0 μm thicknesses. Tailoring the deposition parameters, including using as the carrier gas of 4 l/min flow rate, changing working distance of 5 mm between nozzle and substrate, reducing the nozzle diameter from 1.1 mm to 0.7 mm and controlling the substrate temperature at 100oC~400oC could improve the flatness of film, coherence between film and substrate and film thicknesses. Single cells with 8YSZ electrolyte thicknesses of 2.7 μm, 3.6 μm, and 5.3 μm were prepared and exhibit highly dense, granular, and crack-free microstructures. The open circuit voltage (OCV) and maximum power density (MPD) of the single cell with electrolyte thickness of 2.7 μm emerged to be 0.91 V and 0.60 W/cm2 at 800?C, respectively. In addition, the ohmic resistivity (Ro) and polarization resistivity (Rp) of the single cells read 0.10 Ω•cm2 and 0.23 Ω•cm2.

並列關鍵字

Aerosol Deposition Method ； SOFC ； Electrolyte ； 8YSZ

參考文獻

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粉體物性及沉積條件對氣膠沉積法製備SOFC電解質膜層之影響

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