直接甲醇燃料電池(Direct Methanol Fuel Cell, DMFC)是一種可將甲醇的化學能直接轉換成為電能的一種發電系統，亦為質子交換膜燃料電池的一種，此燃料電池的膜電極組(Membrane Electrode Assembly, MEA)是將陰陽兩極之多孔性觸媒在質子交換膜兩側熱壓而成。壓製條件的最佳化是電池效能的關鍵之一。本研究目標為對膜電極組熱壓時的溫度、壓力，在壓製過程前在質子交換膜先析鍍一層白金鍍層，以及使用不同中孔洞碳材作為觸媒擔體做一系列的研究，並與市售碳材、市售觸媒比較。
利用三極式的甲醇燃料電池系統對電池進行放電性能測試，可就放電極化曲線對陰陽兩極做個別的分析，進而得知熱壓溫度、壓力對陰陽兩極個別影響的程度，以獲取最適合的膜電極組製備條件。另外使用氣相層析儀求取甲醇滲透量，且以電化學方法了解觸媒電化學活性。
研究發現經由改變流場板的設計，讓膜電極組可以與流場板接觸良好，在僅使用碳紙擴散層而減少碳布擴散層的使用可減少電池的阻抗，的確可以提昇電池的效能，電池放電電壓0.2伏特時，電流密度大約能夠有21.3%的增加。中孔洞碳材作為觸媒擔體製備而成的觸媒，當碳材比表面積愈大，則觸媒的催化活性愈大。其中自製中孔洞碳材MC5與市售觸媒相比，觸媒活性稍小，但因其多孔的特性，使其較不受質傳阻力所影響。使用不同碳擔體，在最佳壓力下，陽極起始電位MC5介於ETEK與Johnson Matthey觸媒之間，但電池最高功率密度分別為兩者的1.6與1.3倍。

Direct methanol fuel cell (DMFC) is a type of power supplier that can directly concert the methanol chemical energy to electrical energy. This type of fuel cell is one kind of proton exchange membrane fuel cells (PEMFC) whose membrane electrode assembly (MEA) is made of a proton exchange membrane with catalyst layers compressed on the both sides. The optimization of fabrication condition is a key factor of the cell performance. This research focused on the effects of hot-pressing temperature and pressure during the preparation of membrane electrode assembly, the application of deposition a platinum layer on the proton exchange membrane before pressing, and the utilization of mesoporous carbon as the catalyst support. The results were compared with commercial carbon support and the commercial catalysts.
In order to obtain the optimization of assembling conditions of MEA, three-electrode system of DMFC was applied to perform the cell analysis for polarization curves of both anode and cathode. The influence of hot-pressing temperature and pressure on the cell performance of individual electrodes were investigated for optimization. Besides, the methanol permeability of the Nafion membranes were measured by gas chromatography and the electrochemical activities of the synthesizes catalysts were also evaluated.
The data showed that the MEA kept in good contact with bipolar plates by changing the design of the flow field. When carbon paper, without carbon cloth, was used for gas diffusion layer, it could reduce the impedence of single cell and promoted the cell performance. The current density increased by 21.3% in the current density at 0.2 voltage of cell voltage. Larger specific surface area of mesoporous carbon support gave higher electrochemical activity of the catalyst. Among the applied mesoporous carbons, MC5 had the best performance. Although the electrochemical activity of catalyst on MC5 was slight less than that of commercial catalyst, the former had smaller mass transport resistance.
The results of the single cell test showed that the highest performance was obtained with PtRu on the mesoporous carbon. The maximum power density of Pt-Ru/MC5 was 1.6 time of that with the commercial E-TEK catalyst and 1.3 time of that with the commercial Johnson Matthey catalyst.

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