氧化釓摻雜氧化鈰(Gd2O3-Doped CeO2, GDC)固態電解質材料被認為最有潛力可取代傳統氧化釔安定氧化鋯(Yttria-Stabilized Zirconia, YSZ)電解質並應用於中溫型固態氧化物燃料電池(Intermediate Temperature-SOFC, IT-SOFC)中。由於在常壓下操作，不需昂貴之真空設備，設備簡單，成本低廉且製程速率快，本研究將發展一新穎常壓電漿噴射束(Atmospheric Pressure Plasma Jet, APPJ)製程，並以硝酸鈰與硝酸釓混合溶液作為前驅物製備GDC電解質材料，以期應用於SOFC之固態電解質材料。
本研究之架構主要分為二大部分討論，第一部分利用常壓電漿噴射束分別通入不同之載氣氣體Ar及O2製備GDC粉體，製備後之粉體材料性質分析分別以X光繞射儀(XRD)分析其結晶結構及粉體尺寸，拉曼光譜儀(Raman)分析結晶相，掃描式電子顯微鏡(SEM)與穿透式電子顯微鏡(TEM)觀察其表面形貌與粉體尺寸，並利用X光螢光分析儀（XRF）確認GDC之化學組成，最後以X光光電子能譜儀(XPS)進一步研究其化學鍵結結構，以探討載氣氣體之效應，結果顯示經由常壓電漿噴射束確實能於短時間內製備出10GDC立方相螢石結構之粉體，而通入Ar載氣氣體製備之GDC粉體有部分還原之情形(Ce4+Ce3+)；通入O2載氣氣體製備之GDC粉體會產生以Ce4+為主之結構，利於離子傳導率的提升。最後利用前驅物與霧化液滴之粒徑關係及電漿內部之化學反應推測GDC粉體之顆粒成形機制。
基於第一部分之結果，再以常壓電漿噴射束沉積GDC薄膜，分別通入Ar載氣氣體及O2載氣氣體，以不同燒結溫度進行熱處理，利用XRD及Raman分析其結晶結構，SEM觀察其表面形貌與薄膜品質，XPS進一步研究其化學鍵結結構，最後以較佳之參數進行GDC薄膜之電性量測及橫截面影像之觀察，並應用於SOFC之複合式固態電解質材料上。結果顯示高溫燒結製程將造成GDC與YSZ之固溶相產生，進而使得導電度開始下降，此部分之最佳製程為通入O2載氣氣體製備之GDC薄膜於燒結溫度1400°C時可獲得最佳之導電度(1.486×10-2 S/cm，量測溫度為750°C)，其值高於8YSZ固態電解質(8.759×10-3 S/cm，量測溫度為750°C)。此結果顯示以常壓電漿噴射束製程應用於製備GDC薄膜於8YSZ基材上，可獲得一多孔性GDC薄膜，後續應用於YSZ電解質支撐型系統形成複合式固態電解質，將可作為靠近陰極材料端之擴散阻障層，以解決單一YSZ電解質與鑭鍶鈷鐵系列之陰極材料之界面上所發生之界面反應問題。

Gadolinia-doped ceria (GDC) materials are considered as electrolytes for the most potential to replace traditional yttria-stabilized zirconia (YSZ) in intermediate temperature solid oxide fuel cell (IT-SOFC). A novel atmospheric pressure plasma jet (APPJ) has been widely applied in industry due to its many advantages of operating in atmosphere, eliminating an expensive vacuum system, high efficiency, and low cost. This study is to evaluate the application of APPJ system to prepare GDC materials via the mixture solution of cerium nitrate hexahydrate (Ce(NO3)3．6H2O) and gadolinium nitrate hexahydrate (Gd(NO3)3．6H2O) as the precursor.
In this study, the framework is primary divided into two parts. For the first part, Ar and O2 were used as the carrier gases to feed the precursor mist into the APPJ preparing GDC particles, respectively. Materials characteristics of GDC particles are investigated by X-ray diffraction (XRD), Raman spectrometer (Raman), field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), X-ray fluorescence spectroscopy (XRF) and X-ray photoelectron spectroscope (XPS). Using Ar as carrier gas, the partial reduction of GDC from Ce4+ to Ce3+ was observed during the plasma synthesis. For the case of O2 carrier gas, however, the main chemical structure of Ce4+ in GDC particles was obtained, which could improve the ionic conductivity of electrolytes. According to the size relationship of the atomized droplets and precursors and chemical reactions inside the plasma region at normal pressure, the one-step fabrication of formation mechanism for the prepared GDC particles was proposed in this study. Meanwhile, the results also demonstrated that the feasibility of preparation of well-crystallized GDC nanoparticles by APPJ system was successfully achieved in short time.

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