電場誘導聚苯胺改質雙馬來醯亞胺複合薄 膜於鹼性直接乙醇燃料電池之應用

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题名:	電場誘導聚苯胺改質雙馬來醯亞胺複合薄膜於鹼性直接乙醇燃料電池之應用
作者:	許竣雯;Hsu, Chun-Wen
贡献者:	化學學系
关键词:	電場;聚苯胺;雙馬來醯亞胺;乙醇燃料電池
日期:	2022-08-01
上传时间:	2022-10-04 10:59:57 (UTC+8)
出版者:	國立中央大學
摘要:	鹼性燃料電池因能使用非白金觸媒，相較於其他燃料電池有望以更低價格出售，近年來的發展受到關注。而其中鹼性燃料電池的離子交換薄膜更是電池效能的關鍵，需要兼顧離子交換薄膜三大重要因素，分別為良好的離子傳導度、高的機械強度、及長久的穩定性，設計出以熱聚合與外加電場方式製備複合高分子膜。本研究選用聚苯胺 ( Polyaniline, PANI ) 為主體，因其具有高機械強度、化學穩定性，也是一種半柔性棒導電聚合物，和改質雙馬來醯亞胺 ( BPMI ) 進行熱交聯成膜，透過酸鹼作用力及氫鍵作用力形成semi-IPN(半互穿網路)結構，並以四種分歧長度的BPMI來探討與PANI交纏情況，分別為BP13、BP11、BP31、BP20，結果顯示BP11具有最好的薄膜選擇率。為了進一步改善物性，將BP11在成膜過程中加入電場使電負度較大的原子 (如O、N原子) 能有效地排列，建構成連續、排列緊密且有方向性的親水通道，相較於無電場誘導的薄膜，經電場極化後能在30RH%與70℃下有高離子傳導度 (2.21x10-2~4.04x10-2 S/cm)的同時還能降低燃料竄透(2.65x10-7~ 9.59x10-8 cm2/s)，也提高了薄膜的化學穩定性，使其運用於鹼性直接乙醇燃料電池中，但BPMI的含量添加超過一定比例後，反而會使其無法與PANI有效交纏或是產生相分離，進而使其物性及電性效能下降。 ;Alkaline fuel cells are expected to be sold at lower prices than other fuel cells because they can use non-platinum catalysts, and the development has attracted attention in recent years. Among them, the ion exchange membrane of the alkaline fuel cell is the key to the battery performance. It is necessary to take into account the three important factors of the ion exchange membrane. For instance, well-behaved ionic conductivity, high mechanical strength, and long-term stability, respectively. The composite polymer membrane was prepared by polymerization and external electric field. In this study, polyaniline (PANI) was selected as the main part, because of its high mechanical strength, chemical stability, and it is also a semi-flexible rod conductive polymer. Then, we used PANI to modify bismaleimide (BPMI) hyper-branched oligomer, and it was thermally cross-linked to form the membrane of a semi-IPN (semi-interpenetrating network) structure through acid-base interaction and hydrogen bond interaction. Finally, we used four different lengths of BPMI, which named BP13, BP11, BP31, BP20, to investigate the entanglement with PANI, and the results show that BP11 has the best membrane selectivity. In order to further improve the physical properties, preparing BP11 membrane under externally applied electric field (E-F poling) makes the atoms with higher electronegativity (such as O, N atoms) , and it can be effectively arranged to form a continuous, tightly arranged and directional hydrophilic channel. In comparison with the membrane without electric field induction, after electric field polarization, not only it has the well-behaved ionic conductivity (2.21x10-2~4.04x10-2 S/cm) at 30RH% and 70℃, but it can lower the ethanol permeability (2.65x10 -7~ 9.59x10-8 cm2/s), simultaneously, improving the chemical stability of the film, and making it more suitable for use in alkaline direct ethanol fuel cells. However, when the content of BPMI exceeds a certain proportion, it will not be able to effectively entangle with PANI or cause phase separation, thereby reducing its physical properties and electrical performance.
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