膨体聚四氟乙烯(ePTFE)膜以聚四氟乙烯为原料膨化拉伸而成,具有耐酸碱、强度高、生物适应性强、抗污染性高等优点.本文对已商品化的ePTFE膜进行亲水处理,并对无膜以及使用Nafion 117质子交换膜,未处理的ePTFE膜,亲水处理的ePTFE膜时的微生物燃料电池的性能进行了比较.实验发现ePTFE膜经过亲水处理后其与水的接触角从122°变化为64°;使用亲水性ePTFE膜的微生物燃料电池获得的最大功率密度为1303 mW/m2,高于无膜(1170mW/m2),使用Nafion 117(840 mW/m2)和未处理ePTFE膜(678 mW/m2)时的功率密度.结果表明ePTFE膜可以作为微生物燃料电池的分隔物,并且通过改善膜表面与水的接触角可以在增加质子传递效率的同时减小氧气的渗透,进而提高微生物燃料电池的电池性能.
Expanded Polytetrafluroethylene membrane (ePTFE) is constructed by biaxial tensed Polytetrafluroethylene (PTFE) in order to form a fibrous tunnel,which has the same excellent characteristics as PTFE.In this study,ePTFE membrane was hydrophilic modification by a feasible method,and then fitted into a single-chamber air-cathode microbial fuel cell (MFC) for examining the electrochemical performance of the cell.The MFC with hydrophilic ePTFE membrane generated cell voltage of 761 mV and maximum power density of 1303 mW/m2 (3.0 A/m2),which is higher than other MFCs.The result shows ePTFE membrane can be used as the separator and it can increase the performance of MFC by improving the proton exchange efficiency and reduce oxygen permeation.
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