研究生: |
鄭凱慈 Kai-Tzu Cheng |
---|---|
論文名稱: |
以電泳法沈積Nafion於燃料電池觸媒層之研究 Investigation of electrophoresis deposition of Nafion ionomer on electrode layer of fuel cells |
指導教授: |
黃炳照
Bing-joe Hwang |
口試委員: |
林智汶
none 陳文正 none 周澤川 none 李嘉平 none |
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: | 2007 |
畢業學年度: | 95 |
語文別: | 中文 |
論文頁數: | 118 |
中文關鍵詞: | 燃料電池 、電泳沉積法 |
外文關鍵詞: | electrophoresisi deposition |
相關次數: | 點閱:283 下載:4 |
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本研究著重在以電泳沈積法將Nafion分子沈積於燃料電池用之觸媒層上,藉由增加觸媒層中反應發生的三相區大小,提高觸媒的利用率,進而達到減少觸媒使用率,降低成本的目的。於實驗中探討幾項影響電泳沈積之因素,如沈積時間、施加之電流大小以及溶液之親疏水性。發現在沈積時間30分鐘時,電池放電效率最好,在放電電壓為0.3V時之電流密度為453 mA/cm2,此組實驗中發現電泳沈積之時間對電荷轉移阻抗的降低比較有成效。在固定總電量下,而當施加電流為5毫安培時,會有最好的電池放電性能,在放電電壓為0.3V時之電流密序為520 mA/cm2。此外,藉由改變Nafion溶液中丙醇之含量來探討親疏水性對電泳沈積之影響時,在丙醇添加量為0.6mL時會有最好的電池放電性能,在放電電壓為0.3V時之電流密度為513 mA/cm2。最後,本實驗選用碳紙電極來探討不同之氣體擴散層材料對電泳沈積之影響,在組成甲醇燃料電池膜電極組後進行放電測試,發現效果不彰,原因可能是不同的結構造成Nafion分子穿透氣體電極,而且表面的觸媒粒子也溶液掉落,造成沈積效果不好,經過電泳沈積後之電池放電反應都不及未經電泳沈積之結果。在本研究探討之實驗條件中,除了氣體擴散層材料的探討外,經過電泳沈積後的電池放電效果都會比未經電泳沈積的實驗來的好。由此可知,電泳沈積法確實可以對電池效率的提昇有很大的幫助。
The main target of this study is to deposit Nafion ionomer into the catalyst layer which is used in a fuel cell application by electrophoretic deposition. The triple phase zone where the oxidation reaction and reduction reaction occur can be increased efficiently. Hence, the utilization of catalyst can be improved a lot. It will be possible to lower the cost of fuel cell.
Conditions involving duration time, applied current and the surface tension of ionomer solution were discussed in this study. By changing the duration time, we found that the best efficiency could be attained of 30 minutes. The largest current density of 453 mA/cm2 was obtained at 0.3V. From the AC-Impedance analysis, it’s was found that the duration time only change the charge transfer resistance in membrane electrode assemblies and had little effect on membrane resistance and interface resistance. In the other experiment, we changed the applied current, but the total charges were fixed by adjusting the duration time. We got the best performance by applying 5 mA for 60 minutes. The largest current density of 520 mA/cm2 was obtained at 0.3V. Furthermore, 1-Propanol was added into the Nafion solution to adjust its surface tension. The best performance was achieved at the addition of 0.6 mL 1-propanol. The largest current density of 513 mA/cm2 was obtained at 0.3V. In the end of this study, we used carbon paper to be the replace carbon cloth which was used in previous experiment. But the performance was not good. The reason might be the different structure of carbon paper from carbon clothe or the poor attachment of catalyst on carbon paper.
Besides the final experiment, we got better performance by depositing the Nafion ionomer in catalyst layer. We can expect that the electrophoretic deposition method will be a potential technology for making the membrane electrode assemblies.
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