本研究利用常壓電漿噴射束系統(Atmospheric Pressure Plasma Jet, APPJ)製備氧化釓摻雜氧化鈰(Gd2O3-doped CeO2, GDC)擴散阻障層(Diffusion Barrier Layer)於商業化中溫型固態氧化物燃料電池(Intermediate Temperature-SOFC, IT-SOFC)，尺寸為10 × 10 cm的大面積薄片狀結構體，全電池組態為LSM陰極層 / 10GDC中間層 / 8YSZ電解質層 / NiO+8YSZ陽極層。透過改變重複掃描次數提出了10GDC的一步成形機制以及對於IT-SOFC電性之影響。
以空氣作為主要氣體與載氣氣體將前驅物引入電漿主區域內部，沉積於半電池之8YSZ電解質層上，完成10GDC擴散阻障層之製備，分別以X光繞射儀(XRD)、掃描式電子顯微鏡(FE-SEM)、X光螢光分析儀(XRF)、拉曼光譜儀(Raman)進行材料分析，最後以百格刀測試評估10GDC膜層之附著性。結果顯示經由常壓電漿噴射束能於短時間內將前驅溶液轉化為氧化物薄膜，製備出10GDC立方相螢石結構之膜層。化學組成分析結果也指出經由電漿製程所製備出的10GDC與初始所調配置之前驅物溶液摻雜比例結果一致，且附著性良好。
以網版印刷法在燒結後的10GDC中間層上製備LSM陰極層，將其封裝並利用電化學分析儀進行測量。陽極端通入氫氣，陰極端通入空氣，操作溫度範圍設定在750°C ~ 800°C之間，研究操作溫度的不同、氣體流量的差異以及長時間穩定性測試。結果顯示隨著操作溫度的上升以及氣體流量的增加，電流密度和電功率密度皆呈現上升的趨勢，且隨著時間的推移，電流密度和電功率密度皆無下降的現象。製備10GDC中間層之全電池於操作溫度800°C下運行120小時電流值可高達74.72 A，最高之電功率密度為558.30 mW/cm2，與原始基材相比(46.37 A, 343.41 mW/cm2)電化學性能明顯提升。說明10GDC擴散阻障層能夠有效的在中溫環境下有良好的電性表現，有效地防止陰極層與電解質層之間的陽離子相互擴散，提高SOFC的穩定性和長期耐久性。

This study utilized an Atmospheric Pressure Plasma Jet (APPJ) system to prepare Gadolinium-doped Ceria (GDC) diffusion barrier layers for Intermediate-Temperature Solid Oxide Fuel Cells (IT-SOFCs). The full cell configuration consisted of a LSM cathode layer / 10GDC intermediate layer / 8YSZ electrolyte layer / NiO+8YSZ anode layer. By varying the number of scan times, a one-step formation mechanism for 10GDC was proposed, along with an investigation of its impact on the electrochemical performance of IT-SOFCs.
Compressed Dry Air (CDA) was used as the main and carrier gas to introduce precursor into the main plasma region, where they were deposited onto the 8YSZ electrolyte layer of the half-cell, completing the preparation of the 10GDC diffusion barrier layer. The crystal structure was analyzed using X-ray diffraction (XRD), the surface morphology of the films was observed using field emission scanning electron microscopy (FE-SEM). The chemical composition was identified using X-ray fluorescence analysis (XRF). Raman spectroscopy confirmed the presence of oxygen vacancies in the 10GDC material. The adhesion of the 10GDC film layer was evaluated using a tape test. The results show that the precursor solution can be rapidly transformed into oxide thin films using the APPJ. The 10GDC film with a cubic fluorite crystal structure was successfully prepared. The surface morphology of the composite layer was found to be uniform and smooth, with slight layering and crack formation. Chemical composition analysis confirmed that the 10GDC prepared through the plasma process had the same doping ratio as the initially prepared precursor solution, and it exhibited good adhesion properties.
The LSM cathode layer was prepared on the sintered intermediate layer using a screen printing method, thereby completing the fabrication of the full cell. The assembled cell was encapsulated, and its electrochemical behavior was evaluated by conducting measurements using an electrochemical analyzer. At the anode side, hydrogen gas was supplied as the fuel, while at the cathode side, air was supplied as the oxidant. The operating temperature was set between 750°C to 800°C. The study investigated the effects of different operating temperatures, variations in gas flow rates, and long-term stability testing.
The results show that as the operating temperature and gas flow rate increase, both the current density and power density exhibit an upward trend. Furthermore, there was no observed decrease in current density or power density over time. The full cell with the 10GDC intermediate layer achieved a maximum current value of 74.72 A and a maximum power density of 558.30 mW/cm² when operated at a temperature of 800°C for 120 hours. These values demonstrate a significant improvement in electrochemical performance compared to the original substrate (with a current value of 46.37 A and a power density of 343.41 mW/cm²). The 10GDC diffusion barrier layer demonstrates effective electrical performance in a medium-temperature environment. It efficiently prevents the diffusion of cations between the cathode layer and the electrolyte layer, thus enhancing the stability and long-term durability of the SOFC.

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