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首页> 外文期刊>Journal of power sources >Control of methanol transport and separation in a DMFC with a porous support
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Control of methanol transport and separation in a DMFC with a porous support

机译：用多孔载体控制DMFC中甲醇的运输和分离

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摘要

The effect of porous support properties such as porosity e and water absorptivity alpha_w, on the methanol crossover (MCO) and transport phenomena through the membrane electrode assembly (MEA) of a direct methanol fuel cell (DMFC) under open circuit conditions was theoretically and experimentally investigated. Porous plates, made of different materials, with different properties, were used as the support of the DMFC, and the performance of the crossover, i.e., CO_2 production rate at the cathode, cell temperature, fluxes of water and methanol, through the MEA with or without the porous plate were measured and compared to each other. The methanol flux increased with the increasing product of e and alpha_w, epsilon alpha_w, and the water flux slightly decreased with its increase, in the range where epsilon alpha_w was over a certain value, suggesting that the methanol flux was controlled by the diffusion resistance through the porous plate, whereas the total flux was not affected by it. It was clearly shown that these porous plates prevented the passive DMFC from undergoing a significant loss of methanol due to the crossover, and also being out of temperature control.
机译：在开路条件下，多孔支撑特性（例如孔隙率e和吸水率alpha_w）对直接甲醇燃料电池（DMFC）的甲醇穿越（MCO）和通过膜电极组件（MEA）的传输现象的影响在理论上和实验上调查。用不同材料制成的，具有不同性能的多孔板用作DMFC的载体，并通过MEA进行交叉性能，即阴极上的C​​O_2生产率，电池温度，水和甲醇的通量。测量是否有多孔板并进行比较。甲醇通量随e和alpha_w，εα_w乘积的增加而增加，并且水通量随其增加而略有下降，在epsilon alpha_w超过一定值的范围内，这表明甲醇通量受扩散阻力的控制。多孔板，而总通量不受它的影响。清楚地表明，这些多孔板防止了被动DMFC由于交叉而遭受甲醇的大量损失，并且也使温度无法控制。

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