Nafion膜厚度对质子交换膜燃料电池性能的影响  

Influence of the Nafion membrane thickness on the performance of proton exchange membrane fuel cells

作　　者：于景荣[1] 衣宝廉[1] 韩明[1] 毕可万[1] 杜学忠[1] 明平文[1] 

机构地区：[1]中国科学院大连化学物理研究所燃料电池工程中心,辽宁大连116023

出　　处：《电源技术》2001年第6期384-386,共3页Chinese Journal of Power Sources

基　　金：中国科学院"九五"重大项目 (KY 95T 0 5 0 1 ) ;中国科学院创新工程近期重大项目 (KGCX 1 Y 0 4 )

摘　　要：采用不同厚度Nafion膜 (Nafion 117,115 ,1135 ,112和 10 1)组装质子交换膜燃料电池 (PEMFC) ,通过测试电池极化曲线 (U/I) ,研究Nafion膜厚度对PEMFC工作性能、氧气还原反应的电极动力学参数和电池内阻的影响 ,通过线性回归分析不同厚度Nafion膜组装PEMFC的内阻计算了Nafion膜材料的电导率。实验结果表明 :( 1)降低电解质膜的厚度将会降低电池的内阻 ,从而有利于提高PEMFC的工作性能 ;( 2 )随着膜厚度的降低 ,U0 值有降低的趋势 ,Tafel斜率b值变化不明显 ;( 3)厚膜组装电池的极化曲线在低电流密度时就偏离了线性 ,其主要原因是质子传质极化引起的 ;( 4 ) 80℃时Nafion膜材料的电导率约为 0 .0 77Ω-1·cm-1。The polarization curves (U/I) of the proton exchange membrane fuel cells (PEMFC) fabricated with Nafion membranes of different thicknesses, such as Nafion 117, 115, 1135, 112 and 101, were evaluated in order to investigate the effects of the Nafion membrane thickness on the performance of PEMFC, electrode kinetic parameters of oxygen reduced reaction, and internal resistance of the cells. Meanwhile, the conductivity of the Nafion membrane material was calculated by linear regressing the internal resistance of the PEMFC with Nafion membranes of different thicknesses. The results show that: (1) the performance of PEMFC with thinner membrane is improved because of its low value of cell internal resistance; (2) the value of U 0 reduces with the decrease of the Nafion membrane thickness and the Tafel slope is not dependent on the Nafion membrane thickness; (3) the polarization curve of the cell with a thick membrane, such as Nafion 117, deviates greatly from linearity at a low current density, which can be explained as that the mass transport limitation is originated from proton transport due to long distance diffusion from the anode to the cathode; (4) the conductivity of the Nafion membrane material at the temperature of 80 ℃ is estimated in the order of 0.077 Ω -1 ·cm -1 .

关 键 词：质子交换膜燃烧电池 质子交换膜 NAFION膜 电池性能 膜电导率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]