- 學位論文
四氧化三鈷修飾陰極以提升希瓦氏腐敗菌為基底之微生物燃料電池之發電效益研究
The Research of Enhancing the Electricity Production of Shewanella putrefaciens - based Microbial Fuel Cell by Modifying Cobalt Oxide on the Cathode
摘要
微生物燃料電池是一種新穎的潔淨能源產出方案來因應即將到來的能源危機，與傳統燃料電池主要的差異在於它毋須使用金屬催化劑修飾陽極，而是使用特定微生物來催化有機分子的氧化，進而將得到的電子傳遞給陽極。接著經由電池外部導線而傳遞給陰極槽的氧氣，並與來自陽極並通透過半透膜的氫離子結合產生水的終產物。然而氧氣的還原反應需要很高的過電壓，在動力學上不利於反應進行，因此需要催化劑。傳統上，白金被廣泛的使用，然而它確有價格過於高昂的缺點，會大幅增加電池的生產成本。因此，本研究以探尋較為廉價的氧氣還原反應催化劑與其反應機制為目標，發現使用金屬氧化物修飾陰極具有能催化氧氣還原並增加微生物燃料電池功率的能力，最終決定使用四氧化三鈷。 本研究中尚探討了四氧化三鈷催化氧氣還原的機制與特性，並進一步進行電池操作參數的最佳化，條件為: 使用Co3O4做為催化劑，修飾比例為70%，陽極槽培養液pH值為5，以葡萄糖做為受質，陰極槽使用磷酸緩衝溶液，pH值設定為5，兩極距離為一公分。研究發現50%的四氧化三鈷可達到5%的白金修飾電極之催化效果，在電池功率方面，與使用僅修飾純導電碳膠的陰極之微生物燃料電池相比，電池最大功率密度在最佳化條件下提升9.53倍。本研究也進行了交流阻抗與電池生命週期的分析。
並列摘要
Microbial fuel cell (MFC) is a novel and clean energy source solution to imminent energy crisis. In contrast to conventional fuel cell, microbial fuel cell, instead of using metal catalyst as anode material, takes advantage of microorganisms to catalyze oxidation organic matters. The released electrons were then transferred to oxygen in catholyte through the external conductive wire. Combining with protons permeates from anolyte, thus the final product was water (H2O). However, the reduction reaction’s nature of high overpotential hinders its spontaneity thermodynamically. As a result, utilizing catalyst for oxygen reduction reaction (ORR) is necessary and inevitable. Conventionally, platinum is served as most frequently used catalyst material, but its high cost may limit large scale production of fuel cell. Therefore, the goal of this study is to search for more cost-effective catalyst material and to evaluate the reaction mechanism for oxygen reduction reaction as replacement of platinum. It is found that metal oxides can be potential candidates for acting as catalyst for oxygen reduction reaction; in the meanwhile, enhance power output efficiency of MFC. In the end, Co3O4 is chosen as the final option. The catalysis mechanism and performance of ORR for Co3O4 is evaluated. In addition, the optimization of operating parameters has been undergone. The optimized conditions are: adopting Co3O4 as cathode catalyst material, modification ratio 70wt.%, anolyte as medium of pH5, glucose used as substrate, pH5 phosphate buffer solution served as catholyte, electrode distance of 1cm. In this study, the effect of modifying 50wt.% of Co3O4 is comparable to 5wt.% of Co3O4. In comparison to the MFC with pure conductive carbon ink modified cathode, the power density is enhanced 9.53 times. The evaluation of electrochemical impedance spectroscopy and life time of MFC is also studied.
參考文獻
延伸閱讀
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