本論文使用實驗室已建立的雙腔體固態氧化物燃料電池（Solid Oxide Fuel Cell, SOFC）測試平台，量測鈕扣型陽極支撐電池（Ni-YSZ/YSZ/LSC-GDC）之電池性能及電化學阻抗頻譜。測試在四個不同溫度（T = 650、700、750、800℃）下進行，並使用了七種不同sccm比例之氨/氫/氮陽極燃料（NH3/H2/N2：0/130/70；40/70/50；45/63/47；50/55/45；55/48/42；60/40/40；87/0/26），陰極則全部使用200 sccm空氣，並且氨完全裂解為氫和氮之sccm比例為H2/N2：130/70。結果顯示：（1）當T ≥ 750℃時，各種燃料比例的性能十分接近，主要是氨在Ni-YSZ觸媒催化下，大於750℃時會完全裂解成氫與氮；（2）在T = 650℃，氨/氫/氮混合氣體中氫比例大於氨時，其性能表現會低於以純氨為燃料時的性能；（3）當T ≤ 700℃時，以氨為燃料的開路電壓（Open Circuit Voltage, OCV）明顯低於其他比例燃料；（4）三種比例燃料（NH3/H2/N2：40/70/50；60/40/40；87/0/26）經過120小時穩定性測試後，掃描式電子顯微鏡（Scanning Electron Microscope, SEM）影像顯示電池微結構無裂痕，僅在以純氨為燃料的電池陽極中發現氮化鎳的存在。本研究證實氨添加氫氣，有助於抑制鎳氮化的產生，其結果對於使用氨燃料的SOFC，有重要的參考價值。;This thesis applies a dual-chamber solid oxide fuel cell (SOFC) testing platform to measure the performance and electrochemical impedance spectroscopy of button-type anode-supported cells (Ni-YSZ/YSZ/LSC-GDC). Measurements are conducted at four different temperatures (T = 650, 700, 750, and 800℃) and with seven different anode NH3/H2/N2 fuel gas flow rates in unit of sccm: 0/130/70; 40/70/50; 45/63/47; 50/55/45; 55/48/42; 60/40/40; 87/0/26, where the same 200 sccm air volume flow rate in the cathode is used. If the complete dissociation of NH3 into H2 and N2 were assumed, the above mentioned seven NH3/H2/N2 anode gases have the same H2/N2 ratio of 130/70 sccm. The results indicate the following four points. (1) At T ≥ 750℃, the cell performances are very similar all seven different anode fuel ratios, because the complete dissociation of NH3 into H2 and N2 can be achieved for the Ni-based catalyst. (2) At T = 650℃, the cell performance of NH3/H2/N2 mixtures with higher H2 content than NH3 is lower than that of pure NH3 fuel. (3) At T ≤ 700℃, the open circuit voltage (OCV) of using pure NH3 fuel is significantly lower than those of the other NH3/H2/N2 fuel ratios. (4) After a 120-hour stability test at 650℃, the cell micro structures remain almost the same without any crack as observed by scanning electron microscope (SEM) for three tested fuel ratios (NH3/H2/N2: 40/70/50; 60/40/40; 87/0/26). However, the later case for the pure NH3 fuel (NH3/H2/N2: 87/0/26) has the detection of nickel nitride in the anode. Moreover, this study substantiates a fact that adding H2 to NH3 fuel can effectively suppress nickel nitridation, offering valuable insights for the application of ammonia-fueled SOFCs.
