氣膠沉積法製備固態氧化物燃料電池之電解質層及特性分析

Fabrication and Characterization of Electrolyte Layer Deposited by Aerosol Deposition Method for Solid Oxide Fuel Cell

劉允翔(Yun-Hsiang Liu)

指導教授 ： 王錫福

國立臺北科技大學/工程學院/材料及資源工程系研究所/碩士(2009年)

摘要

本實驗以”氣膠沉積法(Aerosol Deposition Method,ADM)”製備固態氧化物燃料電池(SOFC)中之緻密電解質層，透過此製程簡單、快速之優勢，分別在Si基板以及NiO-8YSZ多孔陽極基板上，成功沉積釔穩定氧化鋯(8YSZ)膜層，並藉由製程參數之改變，配合XRD、SEM之分析探討膜層之性質優劣。
結果顯示兩種不同基板下之膜層具有不同之膜層平整性，隨著基板溫度之提升，膜層之厚度也隨之提升，然而緻密性卻不如室溫基板下之膜層，而以流量5 l/min之O2進行ADM所得之8YSZ膜層具有相對較佳之緻密性;退火後膜層產生之非連續性裂紋與孔洞，可透過基板預加熱至300oC來改善；將氣膠施以微波電漿處理，並未使膜層有明顯緻密性上之精進;在XRD分析結果，無論有無施加微波功率，ADM所製備之膜層皆無相變化之發生，仍保持初始粉末之成分組成與結構，唯獨晶相繞射峰皆有寬化之現象發生。
全電池製作方面，以單軸成型法製備出NiO-8YSZ陽極基板，配合ADM沉積上8YSZ電解質層完成半電池之製作，再將陰極(20LSM,20LSM-8YSZ)網印之製備成全電池。全電池在900及800oC之工作溫度下，開路電壓分別為0.66、0.72 V，電功率密度分別為0.13、0.06 W/cm2，而歐姆阻抗值分別為1.5、4.1Ωcm2。

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

The dense 8YSZ film is successfully deposited on Si wafer and porous NiO-8YSZ by Aerosol deposition method(ADM) in the study. The porous NiO-8YSZ substrate was pressed uniaxially at pressures of 40 MPa.To seek the better performance of electrolyte layer for SOFC unit cell,the influence of processing parameters on the phase components and microstructures of 8YSZ thick film are investigated by XRD and SEM.
The results show that the surface roughness of 8YSZ film on Si and NiO-8YSZ are different.The densification of film decreases with the increasing substrate temperature.The discontinuous cracks in annealed film can be almost eliminate by pre-heating the substrate to 300oC.The better densification of film can be approached by using the 5 l/min flux of O2 as carrier gas but it does not get advanced by imposing the microwave power.For XRD analysis,the constituents and crystal structures of the 8YSZ film do not change as changing the carrier gas or microwave power, however, the width of peaks are broader than that in raw powder.
The material of cathode is 20LSM and it is prepared by screen printing to complete the unit cell.The results show that at 900oC and 800oC,the open circuit voltage(OCV) are 0.66 and 0.72 V respectively and the highest power density at 900oC is 0.13 W/cm2.The ohmic resistance is increased from 1.5 to 4.1Ωcm2 with the decreasing operaturing temperature from 900 to 800oC.

並列關鍵字

SOFC ； ADM ； Electrolyte ； 8YSZ

參考文獻

[41]. 王宣又,” 以氣膠沈積法建立鋯鈦酸鉛厚膜低溫微製程技術,”國立台灣大學,pp. 34-38,(2008).

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