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| 研究生： |
蔡明志 Ming-Chih Tsai |
|---|---|
| 論文名稱： |
摻雜磷酸聚苯并咪唑之微結構分析 Investigation on microstructure of phosphoric acid doped PBI membranes |
| 指導教授： |
陳志堅
Jyh-Chien Chen |
| 口試委員: |
游進陽
Chin-Yang Yu 陳貴賢 Kuei-Hsien Chen 林麗瓊 Li-Chyong Lin |
| 學位類別： |
碩士 Master |
| 系所名稱： |
工程學院 - 材料科學與工程系 Department of Materials Science and Engineering |
| 論文出版年： | 2016 |
| 畢業學年度： | 104 |
| 語文別： | 中文 |
| 論文頁數： | 57 |
| 中文關鍵詞： | 高溫質子交換膜燃料電池 、聚苯并咪唑 、質子通道 、微結構 、原子力顯微鏡 、穿透式電子顯微鏡 |
| 外文關鍵詞： | PEMFC, PBI, ion channel, microstructure, AFM, TEM. |
| 相關次數： | 點閱：432 下載：1 |
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近期，聚苯并咪唑薄膜(PBI)之研究在高溫燃料電池中備受關注，然而，聚苯并咪唑薄膜在發展上遭受到許多問題，如：聚苯并咪唑之溶解度、白金毒化和質子傳導率的提升每項都是挑戰。在本研究中，以溶膠凝膠法(sol-gel transition fabrication)製備聚苯并咪唑(p-PBI)薄膜，並與以溶液澆鑄法製備而成之商用聚苯并咪唑(m-PBI)薄膜進行性質的比較。在同樣磷酸摻雜量下(ADL 10)，將兩種製程薄膜進行質子傳導比較，溶膠凝膠法的質子傳導率為0.208 S cm-1是溶液澆鑄法之薄膜(0.11 S cm-1)的兩倍。為了探討兩種薄膜之性質差異，利用原子力顯微鏡(AFM)、導電性原子力顯微鏡(C-AFM)及穿透式電子顯微鏡(TEM)來探討聚苯并咪唑薄膜之微結構。在相同的磷酸摻雜量情況下，溶液澆鑄法之薄膜具有較分散且較小(50 nm)之質子通道，而以溶膠凝膠製成之薄膜具有較多連結且較大(70 nm)之質子通道。在單電池測試方面，在同樣磷酸摻雜量下，以溶膠凝膠法製成之薄膜效能為1050 mW cm-2約為溶液澆鑄法之薄膜效能(570 mW cm-2)的兩倍。透過薄膜表面和橫切面(cross section)的微結構分析之影像，證明了薄膜之性質受到質子傳遞通道的影響甚鉅。以溶膠凝膠製成之薄膜在高溫燃料電池的發展具有相當大之潛能。
Recently, there has been great interest in developing polybenzimidazole (PBI) membranes for high temperature Proton Exchange Membrane Fuel Cell (PEMFC). Research on PBI membranes for high-temp PEMFC has encounter many problems, such as high solubility of PBI, Pt poisoning and low proton conductivity. Herein, we prepared pata-polybenzimidazole membranes (p-PBI) by sol-gel method and compared it with commercially available meta-polybenzimidazole membrane (m-PBI) which was prepared by solution casting method. p-PBI with an acid doping level(ADL) of 10 PA/RU showed proton conductivity of 0.208 S cm-1 which is twice higher than that of commercial m-PBI with the same acid doping level (0.11 S cm-1). Their properties were found to be dependent on their polymer structure as well as the membrane morphology. Microstructures of PBI membranes have been studied by AFM, conductive AFM, EDS and TEM. p-PBI prepared by sol-gel method with ADL=10 PA/RU showed well connected ion channel with size about 70 nm which is larger than that of commercial m-PBI (50 nm). In the fuel cell test, p-PBI membrane prepared by sol-gel method with an acid doping level(ADL) of 10 PA/RU showed peak power density of 1050 mW cm-2, which is twice higher than that of solution casting m-PBI membrane with the same acid doping level (570 mW cm-2). This indicates that, in addition to ADL, microstructure of membranes plays a very important role on the proton conductivity and fuel cell performance. Their morphological images observed by AFM, C-AFM and TEM show the existence of ionic channels, which can be good indication for proton conductivity of the membranes.
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