研究生: |
江奕成 Yi-Chen Chiang |
---|---|
論文名稱: |
摻雜磷酸及氯化銻/氯化錫/氯化鐵之ABPBI質子交換膜 Proton exchange membranes of poly(2,5-benzimidazole) ABPBI doped with phosphoric acid and antimony chloride/tin chloride/iron chloride |
指導教授: |
蔡大翔
Dah-Shyang Tsai |
口試委員: |
陳燿騰
Yaw-Terng Chern 王丞浩 Chen-Hao Wang |
學位類別: |
碩士 Master |
系所名稱: |
工程學院 - 化學工程系 Department of Chemical Engineering |
論文出版年: | 2016 |
畢業學年度: | 104 |
語文別: | 中文 |
論文頁數: | 95 |
中文關鍵詞: | 氯化銻 、聚(2.5-苯並咪唑) 、有機/無機複合膜 、質子交換膜 |
外文關鍵詞: | proton exchange membrane, organic/inorganic composite membrane |
相關次數: | 點閱:194 下載:1 |
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本實驗使用自行合成的聚(2,5-苯並咪唑) (Poly(2,5-benzimidazole), ABPBI)高分子,摻雜磷酸與氯化銻/氯化錫/氯化鐵,形成有機/無機複合膜,希望能將此ABPBI複合膜作為質子交換膜,應用於操作溫度為160~200℃的PEMFC。研究中分為兩個部份來探討ABPBI複合膜的性質: (1)其在不同溫度下(80~240℃)之質子導電率; (2)藉由拉伸試驗來比較複合膜之機械性質。
在未增濕氣氛下(PH2O~0.03 atm),摻雜磷酸與氯化銻的複合膜在160℃時,具有最高質子導電率為6.7×10-2 S/cm; 其次為摻雜磷酸與氯化錫的複合膜,在200℃下可達到最高質子導電率4.5×10-2 S/cm,而摻雜磷酸與氯化鐵的複合膜在180℃下可達最高質子導電率3.5×10-2 S/cm。三種ABPBI複合膜之質子導電率皆比僅摻雜磷酸的ABPBI膜還要高了許多,其最高質子導電率為在180℃下的2.0×10-2 S/cm。
研究中透過拉伸試驗來比較膜材之機械性質,其中未摻雜磷酸與氯化物的ABPBI膜之楊氏係數為3.67±0.61 GPa,強度高但可塑性低,屬於脆性材料; 摻雜磷酸之後,膜材可塑性增加,強度下降,其楊氏係數為0.16±0.04 GPa,屬於延性材料。相較之下,摻雜磷酸與氯化錫/氯化鐵的複合膜也屬於延性材料,其楊氏係數分別為0.17±0.03 GPa與0.065±0.017 GPa,而摻雜磷酸與氯化銻的複合膜則介於延性材料與脆性材料之間,其楊氏係數為0.22±0.01 GPa。
In the attempt of membrane electrolyte for high-temperature proton
exchange membrane fuel cell, we have synthesized Poly(2,5-
benzimidazole), the so-called ABPBI. A few organic/inorganic membranes
are prepared through doped with phosphoric acid (PA) and one of antimony,
tin, or iron chlorides. And their proton conductivities are measured between
80 and 240 C, their mechanical properties are measured in tensil testing.
Under the unhumdified conditions, with partial pressure of water vapor =0.03 atm, the composite membrane, doped with PA and SbCl5, exhibits the highest conductivities, measured 6.7×10-2 S cm-1 at 160 C. In contrast, the composite membrane, doped with PA and SnCl4, shows the proton conductivity 4.5×10-2 S cm-1 at 200 C. The composite membrane, doped with PA and FeCl3, displays the proton conductivity 3.5×10-2 S cm-1 at 180 C. The highest conductivities of these three membranes are higher than that the membrane doped with PA alone, which shows the highest conductivity 2.0×10-2 S cm-1 at 180 C. SbCl5 appears to be the best co-dopant with PA for ABPBI, just like in case of PBI.
Intriguingly, the three composite membranes demonstrate their unique mechanical properties. Consistent with the literature knowledge on PBI membrane, the undoped ABPBI membrane displays brittle characteristics with Young modulus 3.67±0.61 GPa, while the PA doped ABPBI shows plasticity and a smaller Young modulus 0.16±0.04 GPa. The composite membranes of PA and SnCl4 or FeCl3 also show ductile properties, with Young modulus 0.17±0.03 GPa and 0.065±0.017 GPa. The composite membrane of PA and SbCl5 shows brittle characteristics at small strains, but ductile features at large strains. Its Young modulus is measured 0.22±0.01 GPa.
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