甲醇燃料電池放電效能之研究

Research to Discharge Electrical Efficiency of Methanol Fuel Cell

本文針對直接甲醇燃料電池模組進行放電效能之測試，包括甲醇燃料溫度變化，甲醇燃料入口壓力變化與長時間放電功率穩定性之實驗分析。希望藉此實驗之分析結果，了解甲醇燃料電池在不同的燃料溫度操作下，是否影響其放電輸出之效能，同時也期望了解甲醇燃料在電池模組之入口壓力變化下，是否也會影響其放電輸出之效能。最後，也觀察甲醇燃料電池於長時間放電操作下，其輸出功率是否穩定。經由本研究所獲得之結果如下：（1） 甲醇燃料溫度愈高，其放電效能愈佳。以40 °C 與20 °C 比較，40 °C 之輸出功率較20 °C 之輸出功率高165%倍。（2） 甲醇燃料的入口壓力，並非壓力愈高輸出功率愈佳，而以甲醇液面高度與電池模組入口H = 21.2 mm 時，有最佳的輸出功率。（3） 對於甲醇燃料長時間放電實驗發現，其放電穩定性，隨甲醇燃料體積增加而呈正比例增加。

This paper presents experimental results concerning the dischargingelectrical efficiency of directed methanol fuel cells. The testing includedthe temperature effect on methanol fuel, the pressure effect of a fuel inleton methanol fuel and the analysis of stability of discharging electrical dischargeefficiency of methanol fuel over a long period. From the experimentalresults, we can understand whether temperature factor effects theelectrical discharge efficiency of methanol fuel. Also, we found whetherthe pressure on a fuel cell inlet effects the electrical discharge efficiency.Finally, we inspected whether the electric discharge from methanol fuel isstable over a long time.The experimental results of this paper are represented as follows: (1)The higher the temperature of the methanol fuel is, the better electricaldischarge efficiency is. The output power at 40 °C is 165% higher thanthat of 20 °C. (2) Fuel inlet pressure increase on methanol fuel cell is not helpful for the power output. When the pressure differential between inletand fuel surface is H = 21.2 mm, we found that the output power of amethanol fuel cell peaked. (3) For electrical discharge stability ofmethanol fuel, we found that it increases directly proportional to the volumeof methanol fuel.