被動式直接甲醇燃料電池最佳化之研製

Manufacturing and Optimal Design of Passive Direct Methanol Fuel Cell

嚴國銘(Kuo-Ming Yen)

指導教授 ： 王金樹 ； 林水泉

國立臺北科技大學/機電學院/製造科技研究所/碩士(2007年)

摘要

本論文之被動式直接甲醇燃料電池利用DuPont之MEA，自行設計NTFL被動式直接甲醇燃料電池，利用CNC雕刻壓克力材質之燃料儲槽、陽極與陰極擋板等電池構成元件。經由改變濃度(0.5 M、1 M、2 M、3 M、4 M及5 M)，溫控甲醇(30℃、40℃及60℃)、螺栓扭矩(4 kgf-cm、5 kgf-cm 、7.5 kgf-cm及 10 kgf-cm)及改變吾人設計之電流收集器曝露率及孔徑(陽極30 %、50%、70 %；陰極30 %，孔徑2 mm及3 mm和40 %，孔徑3 mm及4 mm)等參數之改變，尋求被動式直接甲醇燃料電池最佳設計參數。
吾人得到被動式直接甲醇燃料電池操作最佳化參數為2 M濃度值(過高則甲醇穿透嚴重；過低則濃度供給不足)、電流收集器型式為A50%C30% d=3 mm相互搭配(曝露率過高則歐姆阻抗(ohm resistance)增大；過低則濃度阻抗(concentration resistance)增加)、螺栓扭矩5 kgf-cm(過高則濃度阻抗過大；過低則接觸阻抗(contact resistance)上升)；於2 M定燃料供給溫度30℃活化後，常溫操作下可得到最大輸出功率為10.23 mW/cm2。將熱管加熱之技術應用於被動式直接甲醇燃料電池，定16 W功率值加熱電池可得最大輸出功率為16.97 mW/cm2，提升約70 %之功率密度。另外，於定電壓0.25 V發現其穩定度可持續供給0.128 W，維持30 min之久，與Faghri[32]之模組相比，穩定度較佳。

關鍵字

被動式直接甲醇燃料電池 ； 電流收集器 ； 熱管

並列摘要

The passive direct methanol fuel cell (DMFC) used in this study was the NTFL passive direct methanol fuel cell module designed by MEA of DuPont, and the cell components included CNC carved acrylic fuel reservoir, anode and cathode shutters. Parameters, including concentration (0.5 M, 1 M, 2 M, 3 M, 4 M, and 5 M), temperature-controlled methanol (30℃, 40℃, and 60℃), and bolt torque (4 kgf-cm, 5 kgf-cm , 7.5 kgf-cm, and 10 kgf-cm), as well the parameters changed for the first time in this study, including exposure and bore diameter of current collector (anode of 30 %, 50%, 70 %; cathode of 30 %, bore diameter of 2 mm, 3 mm, and 40 %, bore diameter of 3 mm and 4 mm), are changed to find the optimal operating parameters for passive DMFC.
The results showed that the optimal parameters of passive DMFC are concentration of 2M (higher would lead to serious penetration of methanol, and lower would result in insufficient concentration), current collector of A50%C30% d=3 mm (higher exposure would increase the ohm resistance, and lower exposure would increase the concentration resistance), and bolt torque of 5 kgf-cm (higher torque would increase the concentration resistance, and lower torque would increase the contact resistance); after the 2 M fuel supply temperature is activated at 30℃, the maximum output achieved under ambient operation is 10.23 mW/cm2. This study also applied the technique of heating the heat pipes on passive DMFC, the maximum output for heated cell under 16W is 16.97 mW/cm2, with a power density increase of 70 %. Also, it was found that voltage of 0.25 V has stability of supplying 0.128 W continuously for 30 minutes. Compared with modules suggested by Faghri[32], this module has higher stability.

並列關鍵字

Passive Direct Methanol Fuel Cell ； Current Collector ； Heat Pipe

參考文獻

旅威科技有限公司、勝光科技股份有限公司 合著，旅標出版，2006

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