杜鴻達2, 李寶華2, 康飛宇2, 陳立泉3
( 1. 東莞新能源電子科技有限公司, 東莞 523080;
2. 清華大學(xué) 深圳研究生院, 深圳 518055;
3. 中國科學(xué)院 物理所, 北京 100080)
摘 要: 利用自制的膜電極組件和自行設(shè)計開發(fā)的模具， 組裝成被動式直接甲醇燃料電池， 測量其在不同甲醇供給濃度下的放電性能。 結(jié)果表明： 隨著甲醇濃度的逐漸增加， 被動式電池的放電性能先上升后下降， 在濃度為2mol/L時性能達到最佳。 對其放電行為的分析表明， 這一現(xiàn)象是陽極濃差極化和甲醇滲透共同作用的結(jié)果。 采用GC熱導(dǎo)的方法， 對甲醇溶液的濃度進行標定， 結(jié)果表明只需微量樣品就可以快速、 準確地測量出甲醇濃度。 采用該方法對被動式單電池在長時間放電過程中燃料腔內(nèi)的甲醇濃度的變化進行了檢測， 通過實驗對此系統(tǒng)的法拉第效率進行了估算， 結(jié)果表明該被動式直接甲醇燃料電池的法拉第效率可以達到44%。
關(guān)鍵字: 被動式直接甲醇燃料電池； 甲醇濃度； 甲醇滲透； 氣相色譜熱導(dǎo)檢測； 法拉第效率
DU Hong-da2, LI Bao-hua2, KANG Fei-yu2
（ 1. Dongguan Amperex Electronics Technology Co., Ltd.,
Dongguan 523080, China;
2. Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China;
3. Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China）
Abstract: A passive liquid feed direct methanol fuel cell (DMFC) was assembled with MEA and self-fabricated. The discharge performance were tested with different feed methanol concentration at room temperature. The results show that the cell discharge performance increases at the beginning then drops with the increasing methanol concentration, and reaches the optimum at 2mol/L methanol, which is caused by anode concentration polarization and methanol crossover. Attempts to character the methanol concentration were made. The results show the GC thermal conductivity method can be used to character the methanol concentration practically. Then this method was applied to detect the methanol concentration change in the fuel container during the cell's long term discharge. Rough calculation shows that Faradic efficiency of our passive cell system is about 44%.
Key words: passive DMFC; methanol concentration; methanol crossover; GC thermal conductivity; Faradic efficiency
