集流板结构对甲醇燃料电池影响的研究

发布时间：2018-05-07 05:09

  本文选题：直接甲醇燃料电池 + 集流板　； 参考：《天津科技大学》2017年硕士论文

【摘要】：直接甲醇燃料电池(DMFC)是直接利用甲醇水溶液作为燃料,空气中的氧气作为氧化剂的一种燃料电池。随着微电子技术的迅速发展,各类便携式电子产品层出不穷,日趋多样化的产品功能和日益捉襟见肘的电源工作时间之间的矛盾在当今便携式电子产品的发展中越来越突出。因其能量密度高、环境友好和燃料补充便捷等特点而成为国内外研究的热点。但是DMFC的实用性还需要解决大量的基础科学问题,其中不同结构的集流板对电池的输出性能具有重要的影响,是DMFC基础研究中的重点之一,本文围绕集流板结构对电池性能影响这一关键性问题进行了研究。首先,本文设计并加工了相同开孔率、不同结构的点状集流板和平行集流板,再将集流板镀上TiN保护层。研究了 DMFC各个操作参数(TiN保护层、封装压力、甲醇浓度)对其性能的影响。结果表明,镀有TiN的集流板因具有良好的导电性和耐腐蚀性,用其组装的电池要比集流板未镀TiN的DMFC性能高4倍左右;封装压力影响扩散层传质和接触电阻,在0.5MPa的情况下,DMFC取得最优性能;甲醇水溶液浓度最佳值为1mol/L,在50℃时电池的最大功率密度可达13.69mW/cm2。然后,本文分别研究了相同开孔率、不同特征尺寸阳极和阴极集流板对DMFC性能的影响,主要从扩散层中的物质传递和欧姆电阻的角度进行分析。结果表明,无集流网的点状集流板最优特征尺寸为2.5mm,平行集流板最优特征尺寸为2mm;含有集流网的点状集流板最优特征尺寸为2-3mm,平行集流板最优特称尺寸为2mm。最后,基于以上的实验分析和研究,开展了同时改变阴极和阳极集流板的实验。实验表明,同时改变两端集流板,最佳特征尺寸是点状半径为1.5mm的集流板和平行沟槽为2mm宽的集流板。十字交错式平行集流板的排布性能优于肋对肋和肋对沟道槽排布方式的DMFC,肋板和沟道槽非等宽设计有利于改善肋板下扩散层中的物质传递。
[Abstract]:Direct methanol fuel cell (DMFC) is a kind of fuel cell which uses methanol aqueous solution as fuel and oxygen in air as oxidant. With the rapid development of microelectronics technology, various portable electronic products emerge in endlessly. The contradiction between the increasingly diversified product functions and the increasingly overstretched power supply working hours is becoming more and more prominent in the development of portable electronic products. Because of its high energy density, environmental friendliness and convenient fuel supply, it has become a research hotspot at home and abroad. However, the practicability of DMFC still needs to solve a large number of basic scientific problems, among which the different structure of the collector board has an important impact on the output performance of the battery, which is one of the key points in the basic research of DMFC. The effect of collector structure on battery performance is studied in this paper. Firstly, we designed and machined the same opening ratio, different structure point collecting plate and parallel collecting plate, and then coated the collector plate with TiN protective layer. The effects of DMFC operating parameters such as tin protective layer, package pressure and methanol concentration on its performance were studied. The results show that because of its good conductivity and corrosion resistance, the battery assembled with TiN has about 4 times higher performance than the DMFC without TiN plating, and the package pressure affects the mass transfer and contact resistance of the diffusion layer. In the case of 0.5MPa, the optimum concentration of methanol solution is 1 mol / L, and the maximum power density of the cell is 13.69 MW / cm ~ 2 at 50 鈩，

本文编号：1855538