優化固態氧化物燃料電池之陽極微結構以提升電池性能之研究;Optimization of Anode Microstructure in Solid Oxide Fuel Cells for Enhancing Performance

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题名:	優化固態氧化物燃料電池之陽極微結構以提升電池性能之研究;Optimization of Anode Microstructure in Solid Oxide Fuel Cells for Enhancing Performance
作者:	林鈺珩;Lin, Yu-Heng
贡献者:	能源工程研究所
关键词:	固態氧化物燃料電池;陽極微結構;聚甲基丙烯酸甲酯(PMMA);造孔劑重量百分濃度;造孔劑粒徑;氣體擴散;Solid Oxide Fuel Cell;Anode Microstructure;Polymethyl Methacrylate (PMMA);Pore-Former Weight Percentage;Pore-Former Particle Size;Gas Diffusion
日期:	2024-07-29
上传时间:	2024-10-09 16:19:25 (UTC+8)
出版者:	國立中央大學
摘要:	本研究探討一系列改善固態氧化物燃料電池陽極微結構之方法。透過改變陽極粉末壓錠克數控制陽極基板之厚度，達到縮短燃料氣體在基板中擴散的距離之目的。接著探討不同造孔劑的使用對電池性能的影響，使用聚甲基丙烯酸甲酯微球(PMMA)取代原始造孔劑Starch，由於PMMA具有單一粒徑及表面光滑之特性，相較於Starch顆粒粒徑不均且熱分解不穩定，PMMA陽極基板有助於改善陽極-電解質層之連接與增進基板其餘部份之氣體擴散。進一步調整PMMA在基板中之重量百分濃度，找到最佳之陽極基板孔隙率與氣體滲透率，以實現更高的功率密度。最後使用不同粒徑之PMMA微球，分析其陽極基板不同孔洞大小之微觀結構，並探討結構上的差異對氣體通道及電池性能之影響。研究結果顯示，在保有一定陽極基板機械強度的前提下，減少陽極厚度確實縮短了氫氣在基板中的擴散距離，使電池性能提升(286.3 mW/cm2)。而因為PMMA與Starch型態上之差異，在更換造孔劑後使歐姆阻抗及低頻阻抗大幅下降，功率密度提升40.2%，達到401.5 mW/cm2。在分析PMMA重量百分濃度之研究中，得出最佳比例16.2wt%之造孔劑添加量，觀察其SEM圖像，隨著孔洞增加，成功改善陽極基板氣體擴散通道，並達到本研究之最高功率密度459.6 mW/cm2。最後探討固定重量比下3微米、5微米PMMA所帶來之結構差異，過小之微球會使陽極基板之孔洞大幅縮小導致氣體擴散不良，使性能降低。最後探討不同流量之陽極、陰極側燃料對PMMA陽極電池的影響，並對其IV性能曲線及EIS交流阻抗進行分析。 ;This study investigates various methods to enhance the microstructure of anodes in solid oxide fuel cells (SOFCs). By altering the mass of anode powder pressed into pellets, the thickness of the anode substrate was controlled to shorten the diffusion distance of fuel gas within the substrate. Subsequently, the impact of different pore-former on cell performance was examined, replacing the original starch pore-former with polymethyl methacrylate (PMMA) microspheres. Due to the uniform particle size and smooth surface of PMMA compared to the uneven particle size and unstable thermal decomposition of starch, PMMA anode substrates help improve the anode-electrolyte layer connection and enhance gas diffusion in other parts of the substrate. Further adjustments were made to the weight percentage concentration of PMMA in the substrate to identify the optimal porosity and gas permeability of the anode substrate, achieving higher power density. Finally, PMMA microspheres of different particle sizes were used to analyze the microstructure of anode substrates with various pore sizes, and the effects of these structural differences on gas channels and cell performance were explored. The results showed that reducing the anode thickness, while maintaining adequate mechanical strength, effectively shortened the hydrogen diffusion distance within the substrate, enhancing cell performance to 286.3 mW/cm². The change in pore-forming agent from starch to PMMA significantly reduced ohmic and low-frequency impedance, resulting in a 40.2% increase in power density to 401.5 mW/cm². Analysis of the weight percentage concentration of PMMA indicated that the optimal pore-forming agent addition was 16.2wt%. SEM images showed that with increased porosity, the gas diffusion pathways in the anode substrate were improved, achieving the highest power density of 459.6 mW/cm² in this study. Finally, the structural differences between 3 micron and 5 micron PMMA at a fixed weight ratio are discussed. Microspheres that are too small will significantly shrink the holes in the anode substrate, resulting in poor gas diffusion and reduced performance. Finally, the effects of different flow rates of fuel on the anode and cathode sides of the PMMA fuel cell were investigated. The IV curves and EIS impedance were analyzed.
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